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Journal articles on the topic 'Soil Site Index'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Schmidt, Margaret G., and Willard H. Carmean. "Jack pine site quality in relation to soil and topography in north central Ontario." Canadian Journal of Forest Research 18, no. 3 (1988): 297–305. http://dx.doi.org/10.1139/x88-046.

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Site index for jack pine (Pinusbanksiana Lamb.) was determined by stem analysis using dominant and codominant trees on each of 99 site plots located in mature, well-stocked, even-aged jack pine stands. Plots located on four major glacial soil groups showed a wide range of site index within each soil group. Separate multiple regression analysis showed that site index was significantly related to different soil and topographic features for each soil group: (i) for morainal soils shallow to bedrock (< 1.0 m deep) (R2 = 0.83), depth to bedrock and coarse fragment content; (ii) for deep morainal

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2

Carmean, Willard H., and Janjun Li. "Soil-Site Relations for Trembling Aspen in Northwest Ontario." Northern Journal of Applied Forestry 15, no. 3 (1998): 146–53. http://dx.doi.org/10.1093/njaf/15.3.146.

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Abstract Past harvesting in Northwest Ontario has produced increased regeneration and increased forest areas supporting trembling aspen stands, resulting in greatly increased utilization of aspen. Thus there is a critical need to accurately estimate site quality and growth and yield for trembling aspen and for identifying productive sites where more intensive aspen forest management can be practiced. Soil-site relations were studied using 95 plots located in mature, fully stocked, evenaged, undisturbed trembling aspen stands. On each plot site index (SIBH50) estimation was based on stem analys

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3

Seymour, Robert S., and Mary Ann Fajvan. "Influence of Prior Growth Suppression and Soil on Red Spruce Site Index." Northern Journal of Applied Forestry 18, no. 2 (2001): 55–62. http://dx.doi.org/10.1093/njaf/18.2.55.

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Abstract Dominant trees of shade tolerant species are often unsuitable for estimating site index because episodes of growth suppression can mask influences of site. A large-scale study in eastern Maine, based on 698 red spruce (Picea rubens) trees sampled with increment cores, and 92 trees sampled by stem analysis, addressed two objectives: (1) Can spruce trees with histories of suppression be used to estimate site index if suppressed periods are converted to free-growth equivalents? and (2) Do important differences in soil physical properties based on drainage and profile characteristics corr

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4

Farrelly, Niall, Áine Ní Dhubháin, and Maarten Nieuwenhuis. "Site index of Sitka spruce (Picea sitchensis) in relation to different measures of site quality in Ireland." Canadian Journal of Forest Research 41, no. 2 (2011): 265–78. http://dx.doi.org/10.1139/x10-203.

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To examine the relationships between Sitka spruce (Picea sitchensis (Bong.) Carr.) site index and site quality variables, we sampled 201 Sitka spruce stands covering the entire range of sites supporting the growth of the species in Ireland. Site index varied significantly with climate and climate surrogate variables, some site quality variables, soil physical and chemical properties, edatopes (combinations of soil nutrient and moisture regimes), rotation types, provenance, and fertilizer regimes. We developed a series of models to predict site index using climate, site, soil physical and chemi

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Scharenbroch, B. C., L. Scheberl, J. C. Gebhard, J. R. Prater, and L. P. Werner. "Towards an Improved Rapid Urban Site Index." Arboriculture & Urban Forestry 49, no. 2 (2023): 90–104. http://dx.doi.org/10.48044/jauf.2023.008.

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Background: An urban site index is an approach for identifying site quality for optimal matching of urban tree tolerances to site conditions and for determining the efficacy of soil management actions. The Rapid Urban Site Index (RUSI) was previously developed and found to significantly relate to urban tree performance. However, the RUSI needs further testing to verify its accuracy in other urban tree populations. Furthermore, calibration of the RUSI with parameter weighting and additional parameters might also improve its accuracy. Methods: The objectives of this study are to: (1) evaluate th

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6

Chen, Han YH, Karel Klinka, and Richard D. Kabzems. "Site index, site quality, and foliar nutrients of trembling aspen: relationships and predictions." Canadian Journal of Forest Research 28, no. 12 (1998): 1743–55. http://dx.doi.org/10.1139/x98-154.

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To examine the relationships between trembling aspen (Populus tremuloides Michx.) productivity, environmental attributes, and foliar nutrients and to make accurate predictions of trembling aspen productivity, we sampled 60 naturally established, fire-originated, and even-aged trembling aspen stands in northern British Columbia. Trembling aspen site index significantly varied with latitude, elevation, aspect, slope position, edatopes, some forest floor and mineral soil physical and chemical properties, and concentrations of some foliar nutrients. To predict site index, we developed multiple lin

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7

Klinka, Karel, Gordon J. Kayahara, and Qingli Wang. "Quantitative characterization of nutrient regimes in some boreal forest soils." Canadian Journal of Soil Science 74, no. 1 (1994): 29–38. http://dx.doi.org/10.4141/cjss94-004.

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In order to assess to what extent soil nutrient properties support differentiation of field-identified soil nutrient regimes, composite samples from each forest floor and 0–30 cm of the mineral soil were collected from 116 forest stands in central British Columbia. The samples were analyzed for acidity, total carbon (tC), total nitrogen (tN), mineralizable-N (min-N), and extractable Ca, Mg, K, P, and SO4-S (eCa, eMg, eK, eP, eSO4); and the results were expressed as concentrations on a dry-mass basis. Mineralizable-N of the mineral soil showed (1) the largest amount of variation in the populati

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8

Anwar, Chairil. "PREDICTION OF TEAK BONITA (SITE INDEX) IN CENTRAL JAVA, INDONESIA, BASED ON SOIL PROPERTIES." JOURNAL OF FORESTRY RESEARCH 4, no. 1 (2007): 9–18. https://doi.org/10.20886/ijfr.2007.4.1.9-18.

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The objective of this study was to determine the most correlated soil and physiographic factor with the site index of teak. Tree height and stand age were recorded from seventy-three plots located in Central Java, Indonesia, to determine site index. Size of each plot was 0.1 ha. Measured site properties measured were percent slope, elevation, slope position, slope length, dominant topographic form, aspect, and thickness of A horizon. Soil samples from A and B horizon were analyzed for soil color, soil texture, available phosphorous, total nitrogen, and organic matter content.  Analysis in

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9

Shaw, John D., Edmond C. Packee, Sr., and Chien-Lu Ping. "Growth of balsam poplar and black cottonwood in Alaska in relation to landform and soil." Canadian Journal of Forest Research 31, no. 10 (2001): 1793–804. http://dx.doi.org/10.1139/x01-119.

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While constructing site index curves for balsam poplar (Populus balsamifera L.) and western black cottonwood (Populus trichocarpa Torr. & A. Gray) for interior and southcentral Alaska, we found variations in growth patterns that appeared to be related to landform and soil properties. We characterized soils for 42 of 65 site index plots in an attempt to explain site productivity variation. We found significant negative correlations between site index and elevation. Region, landform, and floodplain characteristics (especially sediment deposition) significantly affected poplar growth rate and

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10

Wang, G. Geoff. "White spruce site index in relation to soil, understory vegetation, and foliar nutrients." Canadian Journal of Forest Research 25, no. 1 (1995): 29–38. http://dx.doi.org/10.1139/x95-004.

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The relationships between site index and measures of soil, understory vegetation, and foliar nutrients were examined using data from 102 white spruce (Piceaglauca (Moench) Voss) stands in the Sub-boreal Spruce zone of British Columbia. Compared with soil physical properties (adjusted.R2 = 0.54), soil nutrient properties (adjusted.R2 = 0.29) were poor predictors of white spruce site index. The best soil model, using depth of major rooting zone, total nitrogen, and slope as predictors, explained 60% of the total variance in site index. The best understory vegetation model, using frequencies of s

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11

Błońska, Ewa, and Kazimierz Januszek. "Usability of enzyme activity in estimation of forest soil quality." Folia Forestalia Polonica, Series A - Forestry 55(1) (March 1, 2013): 18–26. https://doi.org/10.2478/ffp-2013-0003.

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Taking into account the progressive degradation of soils it is important to assess their quality. Soil quality depends on a large number of physical, chemical, biological and biochemical properties. In the publications available, there are presented three approaches regarding the use of soil properties to estimate soil quality: (1) the use of individual properties, (2) the use of simple indexes and (3) the use of complex indexes derived from combinations of different properties. The purpose of this study was to investigate the possibility to use enzymes as indicators of forest soil quality. Ex

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12

Bijak, Szymon. "Selected properties of organic soils under boreal mire spruce forest in the Romincka Forest, NE Poland." Soil Science Annual 68, no. 4 (2017): 182–88. http://dx.doi.org/10.1515/ssa-2017-0023.

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Abstract The paper presents selected properties of the organic soils developed in boreal mire spruce forests (Sphagno girensohnii-Piceetum) in the Romincka Forest (NE Poland). Additionally, the relationship between soil fertility and forest stand productivity was investigated. Data from 12 soil profiles, differing in terms of peatland ecological type (raised bog, transitional bog and fen) was used. The significance of the differences in soil properties among peatland types was assessed with the Kruskal-Wallis test. Soil fertility was described using soil trophic index (SIGo), whereas stand pro

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13

Belli, Keith L., John D. Hodges, and Jeffery C. G. Goelz. "Site Productivity Assessment for Cherrybark Oak on Minor Stream Bottoms in Mississippi: A Comparison of Methods." Southern Journal of Applied Forestry 22, no. 1 (1998): 7–10. http://dx.doi.org/10.1093/sjaf/22.1.7.

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Abstract A study was conducted to test the accuracy of two soil-based site quality estimation methods against actual site index values for cherrybark oak located on minor stream bottoms in Mississippi. At the same time, the potential effects of slight changes in topographic position on estimated site quality and observed soil characteristics were examined. Of the two soil-based methods, only one system provided accurate estimates of observed site index. However, both soil-based methods proved to be more sensitive than observed site index to changes in topographic position. Finally, the soil ch

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14

Aitimova, Aynazhan M., Gusman Zh Kenzhetayev, and Vladimir N. Permyakov. "Studying the state of soils in the territory of the Shetpe South chalk deposit." Oil and Gas Studies, no. 3 (July 10, 2019): 135–46. http://dx.doi.org/10.31660/0445-0108-2019-3-135-146.

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Investigations were carried out to study the state of the soil in the territory of the Shetpe South chalk deposit and in the area of the Caspian Cement plant in October 2018. 20 soil samples were taken. Samples were taken from a depth of 0–20 cm. The presence of heavy metals in the soil was determined by atomic absorption spectrometry using AAC MGA-915M (Lumex, Russia), their content was compared with background values and with existing maximum allowable concentrations. The total soil pollution indicator or ZC , using the background, was used to study the state of the soil. The indicators of t

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15

Jiang, Huiquan, Philip J. Radtke, Aaron R. Weiskittel, John W. Coulston, and Patrick J. Guertin. "Climate- and soil-based models of site productivity in eastern US tree species." Canadian Journal of Forest Research 45, no. 3 (2015): 325–42. http://dx.doi.org/10.1139/cjfr-2014-0054.

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As concerns rise over potential effects of greenhouse gas related climate change on terrestrial ecosystems, forest managers require growth and yield modeling capabilities responsive to changing climate conditions. Our goal was to develop prediction models of site index for eastern US forest tree species with climate and soil properties as predictors for use in predicting potential responses of forest productivity to climate change. Species-specific site index data from the USDA Forest Service Forest Inventory and Analysis (FIA) program were linked to contemporary climate data and soil properti

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16

Gordon, Andrew M., Peter A. Williams, and Edward P. Taylor. "Site Index Curves for Norway Spruce in Southern Ontario1." Northern Journal of Applied Forestry 6, no. 1 (1989): 23–26. http://dx.doi.org/10.1093/njaf/6.1.23.

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Abstract Four dominant or codominant Norway spruce trees from each of 55 sites were destructively sampled and the annual height growth determined by stem analysis. The sampled sites were stratified by soil textural class (coarse, medium, and fine) and depth to distinct mottling (0-16, 16-40, and 40 in.). Two sets of an-amorphic site index curves were constructed using a total age of 30 years (SI30), and breast height age of 25 years (SIBH25) as base ages. The mean SI30 from Ontario (53 ft) was found to be 17.8% higher than the mean values published from Vermont (45 ft) and currently used in On

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17

Karira, Hemu, Aneel Kumar, Anees Raja, and Ali Murtaza. "Correlation between Chemical and Index Properties of Soils of Hyderabad Region." Civil Engineering Journal 4, no. 12 (2018): 2821. http://dx.doi.org/10.28991/cej-03091201.

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Each soil has unique nature of the characteristics and its properties are beyond the control of the designer. Since the soil parameters varies from site to site or location to location, thus selecting the reliable properties of soil is always a challenge for the Geotechnical Engineers. One of the option is intense soil investigations. However, there are various soil properties whose determination is time consuming and expansive. Geotechnical Engineer usually tries to develop mathematical equations specific to a particular soil type. However, a mathematical formula that is more reliable for the

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18

Konrad, Jean-Marie. "Frost susceptibility related to soil index properties." Canadian Geotechnical Journal 36, no. 3 (1999): 403–17. http://dx.doi.org/10.1139/t99-008.

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The analysis of frost-heave data on several soils confirmed that segregation potential, hence frost susceptibility, of saturated soils was best related to the average size of the fines fraction, the specific surface area of the fines fraction, and the ratio of the material's water content to its liquid limit. The influence of overburden pressure can also be accounted for by an empirical relationship between the segregation potential, the average size of the fines fraction, and the compressibility index of the soil. The segregation potential was also proportional to the relative fines content i

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19

Oke, Isaiah A., Catherine Mayowa Ikumapayi, Adekemi L. Ayodele, et al. "SPATIAL VARIABILITY OF THE GEOTECHNICAL PROPERTIES OF SOILS: A CASE STUDY OF ELIZADE UNIVERSITY." FUDMA JOURNAL OF SCIENCES 8, no. 5 (2024): 156–74. http://dx.doi.org/10.33003/fjs-2024-0805-2662.

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Soil variability can alter the mechanical behaviour of foundations. It is therefore, necessary to conduct site investigations specific geotechnical analysis before any construction. This study evaluated selected engineering index and properties of soils at three different locations (sites) and depths withing Elizade University (EU), Ilara-Mokin. Five soil samples were collected from each of these locations and their engineering index and properties were determined. Statistical analysis namely Analysis of Variance (ANOVA) was utilised to determine the effects of location within the campus on th

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20

Kim, Dokyung, Jin Il Kwak, Rongxue Cui, et al. "A comparative Study of Ecological Risk Index for Site-specific Soil Ecological Risk Assessment." Journal of Korean Society of Environmental Engineers 44, no. 11 (2022): 426–35. http://dx.doi.org/10.4491/ksee.2022.44.11.426.

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Objectives : Since the risk of pollutants in soil environment may vary depending on the characteristics, functions, and environmental conditions of the soil, the site-specific soil ecological risk assessment (SERA) should be conducted to protect soil ecosystem from pollutants. It has been confirmed that each country is conducting SERAs based on site-specific guidelines suitable for their own conditions. However, in Korea, there is a lack of basis for introducing SERA, therefore, the development of techniques for SERA which is suitable for domestic soil conditions is required. Accordingly, this

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21

Apata, A. C., Ismail Abdullahi, U. U. Imoh, and Praise Dawodu Onimisi. "Site Investigation and Shear Strength Properties of Soil." Journal of Engineering Research and Reports 24, no. 10 (2023): 1–12. http://dx.doi.org/10.9734/jerr/2023/v24i10843.

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This study examined the soil's shear strength qualities at various depths with natural soil moisture content. At various depths below the surface of the ground, ranging from 400mm to 24.75m for point 1 and 400mm to 11.25m for point 2, the soil sample was taken using the drilling method. Wet sieve analysis was used to determine the distribution of the grains, and each soil sample's natural moisture content was calculated. Other fundamental tests included the Atterberg limit test, specific gravity, and sieve analysis. The data revealed that silt and clay make up the soils at points 1 and 2, with

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22

Monserud, Robert A., Ula Moody, and David W. Breuer. "A soil-site study for inland Douglas-fir." Canadian Journal of Forest Research 20, no. 6 (1990): 686–95. http://dx.doi.org/10.1139/x90-092.

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A soil-site study was conducted for inland Douglas-fir growing in northern Idaho and north western Montana. The hypothesis was that standard soil survey procedures would provide edaphic data that could predict site index in the absence of site trees. Soil profile descriptions and physical analyses were obtained on 133 plots, along with several physiographic site descriptors. Chemical analyses were performed on soil samples from a third of these plots, and moisture availability was determined on 60% of the plots. Site index was based on felled-tree stem analyses. Elevation was the strongest pre

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23

Kim, Lee Yul, Hyun Jun Cho, Sun Ok Chung, Won Yeop Park, and Kyou Seung Lee. "Determination of Tillage Depth Based on Physical Properties of Soil for Rice Production in Korea." Key Engineering Materials 321-323 (October 2006): 1229–32. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.1229.

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Compaction is becoming a great concern in crop production and the environment. Recently, three has been a need of field management based on site-specific conditions to improve sustainability of agriculture and reduce environmental damage. In the study, soil management or tillage depth was recommended nondestructively based on cone index profiles for typical Korean rice paddy fields. Field variables related to tillage, soil strength, rice growth, and other soil physical properties showed considerable spatial and vertical variations as well as significant (α<0.1) correlations among them. Cone

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24

Klinka, K., and R. E. Carter. "Relationships Between Site Index and Synoptic Environmental Factors in Immature Coastal Douglas-Fir Stands." Forest Science 36, no. 3 (1990): 815–30. http://dx.doi.org/10.1093/forestscience/36.3.815.

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Abstract Indirect synoptic measures of climate, soil moisture, and soil nutrients are used to characterize site quality in the biogeoclimatic ecosystem classification. To assess relationships of these measures to potential forest productivity, environmental and site index data from 133 sample plots established in immature coastal Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) stands were utilized. The stands were distributed across three climatic regimes (biogeoclimatic units), five soil moisture regimes, and five soil nutrient regimes. These regimes were used as categorical variables in s

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25

Splodytel, А. "HEAVY METALS DISTRIBUTION TRENDS ON "OLESHKIVSKI PISKY" MILITARY TRAINING SITE." Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 2 (89) (2020): 42–48. http://dx.doi.org/10.17721/1728-2713.89.06.

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The results of ecological-geochemical researches of soil cover of "Oleshkivski pisky" military training site, using maximum allowable concentration and classification of chemical elements with respect to hazard classes are presented. Analytical works to identify gross content and heavy metals movable forms in soils were defined by methods of atomic absorption and mass-spectometry with inductively coupled plasma (ICPMS) as well as by using gamma-ray activation analysis and X-ray fluorescence analysis. Analysis and interpretation of the coefficients of heavy metal components concentration were c

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Chen, Han YH, Pavel V. Krestov, and Karel Klinka. "Trembling aspen site index in relation to environmental measures of site quality at two spatial scales." Canadian Journal of Forest Research 32, no. 1 (2002): 112–19. http://dx.doi.org/10.1139/x01-179.

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To evaluate the variation in trembling aspen (Populus tremuloides Michx.) productivity at a large geographic scale, we examined the relationships between site index and environmental factors from 142 even-aged, fully stocked stands located on a variety of sites across interior British Columbia. Site index was derived from stem analysis and the environmental measures included climate surrogates (latitude, longitude, and elevation), biogeoclimatic zone, slope aspect, actual soil moisture regime (SMR), and soil nutrient regime (SNR). The spatial gradients (latitude, longitude, and elevation), sl

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27

Al-Nimah, Ahmed K. "The Effect of Oil Contamination on some Geotechnical Properties of West Qurna Oilfield Soils at Basrah, Southern Iraq." Iraqi Geological Journal 54, no. 2B (2021): 76–84. http://dx.doi.org/10.46717/igj.54.2b.7ms-2021-08-27.

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Oil contamination in soils causes several geotechnical problems that must be considered during construction. The contamination occurs due to oil seepage which could happen during oil explorations and production processes or oil transportation. The site of West Qurna oilfield in Basrah was selected for this study because it has witnessed oil seepages many times. In order to study the significant impact on geotechnical properties of soils in the West Qurna site, as uncontaminated bulk soil sample was taken at a depth of 1 m, and crude oil was added at weight ratios of 2, 4, 6, 8, and 10 %. Labor

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McNab, W. Henry. "Effects of Landform on Site Index for Two Mesophytic Tree Species in the Appalachian Mountains of North Carolina, USA." International Journal of Forestry Research 2010 (2010): 1–7. http://dx.doi.org/10.1155/2010/298674.

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The effects of soil and topographic variables on forest site index were determined for two mesophytic tree species, northern red oak (Quercus rubraL.) and yellow-poplar (Liriodendron tulipiferaL.) in the Southern Appalachian Mountains of North Carolina. Stand variables included soil solum thickness, soil A-horizon thickness, elevation, aspect, slope gradient, and landform index. Landform index is a recently devised environmental variable that has been used to quantify the influence of topography surrounding a stand on productivity. Regression analysis indicated that among the variables only la

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Liu, Hao, Zheng Huang, Wen Qi, Han Shi, and Lijuan Yao. "Study on the Engineering Properties of Waste Soil-Based Flowable Fill." Journal of Physics: Conference Series 2468, no. 1 (2023): 012092. http://dx.doi.org/10.1088/1742-6596/2468/1/012092.

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Abstract Flowable fill is developed mainly for the difficult backfilling and compaction such as side trenches of foundation pits and retaining wall backfills. It can make use of waste soils. It has good flowability before curing, and thus can be compacted by its own weight. It also has high strength after curing. In this study, by using on-site waste soils as the raw material soil, 25 groups of flowable fill experiments were carried out. The relationship between flowability, strength and mix ratio of flowable fills was analyzed. The results show that the flowability of flowable fill increases

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Permana, Andrianto Muliawan, and Paulus Pramono Rahardjo. "The site characterization of central jakarta soft soil using CPTu and laboratory test." Indonesian Geotechnical Journal 1, no. 1 (2022): 25–40. http://dx.doi.org/10.56144/igj.v1i1.6.

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Construction activities has been named as one of the contributing factors to Jakarta’s alarming rate of land subsidence, which ranges between 1 to 15 cm annually, and up to 28 cm in some locations. This problem is commonly known as settlement, and the affected soft soil is usually attributed to under-consolidating soil (UC). In regards to that matter, this study aims to characterize the soft soil layer in Central Jakarta using the Cone Penetration Test with pore pressure measurement (CPTu) and laboratory assessment. In addition, Undrained Shear Strength () and Pore Pressure Ratio (and ) method

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Irenasari, Almira Harwidya, and S. Soemarno. "Soil Moisture Assessment Using Soil Moisture Index (SMI) Method at the Bangelan Coffee Plantation, Malang Regency, East Java." Jurnal Tanah dan Sumberdaya Lahan 9, no. 1 (2022): 1–12. http://dx.doi.org/10.21776/ub.jtsl.2022.009.1.1.

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Water is one of the limiting factors in the growth of coffee plants. If plants experience a lack of water, it can inhibit plant growth and, at a critical level, can lead to drought stress and plant damages. The available soil water to plants can be estimated from the level of soil moisture index. The monitoring of soil moisture status can be used in improving the management of coffee plantations. Soil Moisture Index (SMI) is a method that can be used to estimate the level of soil moisture using remote sensing technology using NDVI and LST values. The purpose of this study was to analyze the st

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32

Chashchin, Aleksey N., and Vitaliy Yu Gilev. "Estimation of the thickness of the fertile layer of technologically disturbed soils using the NDVI vegetation index." SOCIALNO-ECOLOGICHESKIE TECHNOLOGII 10, no. 3 (2020): 290–305. http://dx.doi.org/10.31862/2500-2961-2020-10-3-290-305.

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The article highlights the possibilities of using the vegetation index NDVI to assess the spatial heterogeneity of the thickness of the fertile layer of technologically disturbed soils. The role of the remotely determined NDVI indicator is known as an indicator of soil fertility, however, no similar studies have been conducted on the territory of Perm region on technologically disturbed soils. The aim of the study was to assess the spatial heterogeneity of the thickness of technologically disturbed soils of Perm region using the NDVI spectral index. The object of research is the soil cover of

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Wang, Ming Wu, Kang Ge, and Da Rong Zhu. "Experimental Study of Engineering Behaviors on Improved Expansive Soils in the Xinqiao Airport Runway of Hefei." Advanced Materials Research 261-263 (May 2011): 1329–35. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.1329.

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Foundation treatment of expansive soils is a complex worldwide problem. Herein engineering behaviors of expansive soils and improved expansive soils with lime (IESL) in the runway area of Xinqiao international airport of Hefei were investigated by means of laboratory experiments and field tests. It was concluded that the expansive soils of mean plasticity index 24.2, and optimum moisture content of 16% in the engineering area, behaved weak and medium expansive potential. The plastic index of improved expansive soil of 7% lime mixed indoor and of 8% lime incorporated on site dropped to 20 and 1

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Khudhur, Nashmeel, Sidra Qubad Yassin, Ahmed Saman Hassan, and Mortatha Nawzad Omar. "Applying Some Indices for Soil Pollution Assessment in Northern Industrial Area from Erbil Governorate." Al-Qadisiyah Journal Of Pure Science 26, no. 4 (2021): 45–58. http://dx.doi.org/10.29350/qjps.2021.26.4.1385.

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Soil pollution by some heavy metals including: Cr, Mn, Fe, Ni, Cu, Zn, As, Mo, Cd and Pb from northern industrial area of Erbil City was assessed. The contamination indices including: geoaccumulation (Igeo), contamination factor (CF), enrichment factor (EF), degree of contamination (Cdeg), pollution load index (PLI) and element contamination index (ECI) were applied to assess soil pollution in Erbil North Industrial area at three sites (for both surface and sub-surface soils). Maximum Fe value 34243.6 ppm was recorded in sub-surface soil (site 2). Maximum values 265.4, 248.8, 98.23 and 397.45

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Garten, Charles T., Michael A. Huston, and Christopher A. Thoms. "Topographic Variation of Soil Nitrogen Dynamics at Walker Branch Watershed, Tennessee." Forest Science 40, no. 3 (1994): 497–512. http://dx.doi.org/10.1093/forestscience/40.3.497.

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Abstract Understanding the spatial and temporal variability of soil nitrogen (N) transformations is central to quantifying the N dynamics and productivity of ecosystems. The objectives of this work were to examine spatial and temporal variation of soil N dynamics and to identify factors correlated with topographic variation in soil N dynamics in a forest watershed. Net N mineralization and net nitrification potential were measured by aerobic laboratory incubations of surface (0-7 cm) mineral soils. Principal components analysis was used to describe sampling sites across the watershed based on

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Wang, G. Geoff, Shongming Huang, Robert A. Monserud, and Ryan J. Klos. "Lodgepole pine site index in relation to synoptic measures of climate, soil moisture and soil nutrients." Forestry Chronicle 80, no. 6 (2004): 678–86. http://dx.doi.org/10.5558/tfc80678-6.

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Lodgepole pine site index was examined in relation to synoptic measures of topography, soil moisture, and soil nutrients in Alberta. Data came from 214 lodgepole pine-dominated stands sampled as a part of the provincial permanent sample plot program. Spatial location (elevation, latitude, and longitude) and natural subregions (NSRs) were topographic variables that might be considered as synoptic measures of climate. Soil moisture regimes (SMRs) were used as synoptic measures of soil moisture supply. Soil nutrient regimes (SNRs) were used as synoptic measures of soil nutrient supply. Simple mea

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Kabzems, R. D., and K. Klinka. "Initial quantitative characterization of soil nutrient regimes. II. Relationships among soils, vegetation, and site index." Canadian Journal of Forest Research 17, no. 12 (1987): 1565–71. http://dx.doi.org/10.1139/x87-240.

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Relationships between soil properties, understory vegetation, foliar properties, and site index were examined in some Douglas-fir ecosystems on Vancouver Island. Multivariate summaries of variation in understory vegetation and foliar properties were highly correlated with the soil properties (mineralizable N, total N, and exchangeable Ca and Mg) that best characterized soil nutrient regimes of the ecosystems. The increases in soil nutrient availability were correlated with increased foliar N concentrations of the current year foliage. A consistent correlation was found between increased soil n

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Rajinder Singh, Rakesh Kumar, and Jitender Kumar. "Assessment of Irrigation Practice in Wheat at Farmers' Fields under Shallow Water Table Conditions through Simulation Model." Journal of Agricultural Engineering (India) 44, no. 1 (2007): 8–15. http://dx.doi.org/10.52151/jae2007441.1232.

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The central and western part of Haryana underlain with brackish ground water quality has experienced rise of water table at a rate of 10 to 30 cm annually during the last three decades. On an average the area under critical water table depth (0-3.0 m) increased from 6.20 per cent in October 2002 to 10.61 percent in October 2003 and 10.27 per cent in October 2004. At present about 2 per cent area of the State is fully waterlogged (0-1.5m). Poor irrigation and drainage management and inadequate exploitation of saline ground water are the main factors responsible for this phenomenon. Physical bas

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Curt, Thomas. "Predicting yield of Norway spruce and Douglas-fir using a morphopedological approach in the granitic landscapes of French Massif Central." Canadian Journal of Soil Science 79, no. 3 (1999): 491–500. http://dx.doi.org/10.4141/s99-002.

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To investigate the productivity of two coniferous species in granitic uplands of the French Massif Central, relationships between soil–landscape units (= morphopedological units) and forest yield were examined. An alveola landscape model composed of seven main morphopedological units (MPU) characterizes these two granitic areas. In total, 460 forest stands were studied and joined to the MPU. Each type of MPU was correlated to the yield of Norway spruce and Douglas-fir, evaluated by the site index (dominant height of stand at a reference age). Results stress that MPU explain a large part of sit

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Zádorová, T., D. Žížala, V. Penížek, and Š. Čejková. "Relating extent of colluvial soils to topographic derivatives and soil variables in a Luvisol sub-catchment, Central Bohemia, Czech Republic." Soil and Water Research 9, No. 2 (2014): 47–57. http://dx.doi.org/10.17221/57/2013-swr.

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Colluvial soils, resulting from accelerated soil erosion, represent a significant part of the soil cover pattern in agricultural landscapes. Their specific terrain position makes it possible to map them using geostatistics and digital terrain modelling. A study of the relationship between colluvial soil extent and terrain and soil variables was performed at a morphologically diverse study site in a Luvisol soil region in Central Bohemia. Assessment of the specificity of the colluviation process with regard to profile characteristics of Luvisols was another goal of the study. A detailed field s

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Azam, M. G., M. A. Zoebisch, K. S. Wickramarachchi, and S. L. Ranamukarachchi. "Site-specific soil hydraulic quality index to describe the essential conditions for the optimum soil water regime." Canadian Journal of Soil Science 89, no. 5 (2009): 645–56. http://dx.doi.org/10.4141/cjss08089.

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This study was conducted in northeast Thailand (i) to identify soil hydraulic quality (SHQ) factors under four common cropping systems in a specific soil series, (ii) to configure indicators from these factors that can be used to develop SHQ indices for each cropping system, and (iii) to describe the essential conditions for the optimum soil water process in the study area. The cropping systems were (i) maize (Zea mays L.)-maize, (ii) mungbean (Vigna radiate L.)-maize, (iii) maize-fallow and (iv) cassava (Manihot esculenta Crantz). Ten representative farms under each system were used to develo

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Shilov, P. M., and O. A. Antsiferova. "Diagnostics of hydrological properties of soils of the Sambian plains based on aerial photography and electromagnetic induction." Dokuchaev Soil Bulletin, no. 122 (March 26, 2025): 127–73. https://doi.org/10.19047/0136-1694-2025-122-127-173.

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The article focuses on studying the influence of the spatial heterogeneity of lithological and geomorphological conditions on the hydrological characteristics of the soils of the Sambian Plain using aerial photography and electromagnetic induction methods. From 2020 to 2022, at the “Pereleski” test site, topographic surveys were conducted using UAV, soil-forming material heterogeneity was diagnosed, and field measurements of particle size distribution, moisture content, and the degree of gleyization were carried out in reference soil profiles (n = 4). Additionally, the morphology of soil horiz

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Dalsgaard, Lise, Holger Lange, Line Tau Strand, et al. "Underestimation of boreal forest soil carbon stocks related to soil classification and drainage." Canadian Journal of Forest Research 46, no. 12 (2016): 1413–25. http://dx.doi.org/10.1139/cjfr-2015-0466.

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Soil organic carbon (C), accumulated over millennia, comprise more than half of the C stored in boreal and temperate forest landscapes. We used the Norwegian national forest inventory and soil survey network (n = 719, no deep organic soils) to explore the validity of a deterministic model representation of this pool (Yasso07). We statistically compared simulated and measured soil C stocks and related differences (measured – simulated) to site factors (drainage, topography, climate, vegetation, C-to-N ratio, and soil classification). Median C stocks were 5.0 kg C·m−2 (model) and 14.5 kg C·m−2 (

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Jiang, Jiong. "Research and Evaluation of Heavy Metal Pollution of Contaminated Site." E3S Web of Conferences 131 (2019): 01107. http://dx.doi.org/10.1051/e3sconf/201913101107.

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This paper made the research on the heavy metal pollution situations in three areas of contaminated sites in Weinan city, including reactor, pollution source and administrative area. The results show that the contaminated sites are polluted at different levels, mainly Hg and As. The evaluation results of nemerow indexes demonstrate that the comprehensive pollution index of soil in reactor area is polluted seriously, the comprehensive pollution index of soil in pollution source area belongs to mild pollution and middle pollution and the comprehensive pollution index of soil in the administrativ

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Mohammed, Elaf W. "Determination of the effect of soil and irrigation water quality on total chlorophyll, carbohydrates, and proteins values in cress, parsley, celery, and basil plants." Kirkuk University Journal For Agricultural Sciences 14, no. 2 (2023): 138–44. http://dx.doi.org/10.58928/ku23.14213.

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The effect of soil and irrigation water quality in three sites of the Khasah Su River basin Kirkuk-Iraq was studied on the values of total chlorophyll, carbohydrates, and proteins of cress, parsley, celery, and basil plants. Samples were collected from November 2021 to May 2022. Sampling sites in the Khasah Su River located between longitudes 44o 23/ and 44o 24/ and latitudes 35o 24/ and 35o 29/. Soil quality index (SQI) values documented poor soil fertility in all sites, especially on the third site. Irrigation water quality index (IWQI) values were excellent in the first site, good in th

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Pietrzykowski, Marcin, Marek Pająk, and Wojciech Krzaklewski. "Application of soil quality indexes for the habitat conditions variability assessment in the forestry rehabilitated former mining spoil banks." Folia Forestalia Polonica, Series A - Forestry 53(1) (March 1, 2011): 17–24. https://doi.org/10.5281/zenodo.30832.

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According to Polish law, all former mining areas, whether for coal or other minerals should be rehabilitated. This paper analyses the possibility of using of indexes of Soil Trophy (ITGL) and Site Soil (SIG) to describe variability in the “Bełchatów” Brown Coal Mine dumping grounds for mining subsidence, which have been reclaimed for forestry. Research was conducted in four substrate variants forming the soil bedrock being created of: nutrient-rich, sandy clay Quaternary (NWL on the inside spoil bank) and clay silt (NZL on the outside spoil bank), as well as poorer Quaternar

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Berguson, William E., David F. Grigal, and Peter C. Bates. "Relative stocking index: a proposed index of site quality." Canadian Journal of Forest Research 24, no. 7 (1994): 1330–36. http://dx.doi.org/10.1139/x94-173.

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Site index is difficult to implement and interpret in multispecies, multiple-aged stands, and its relationship to site factors is obscure. Using data from the USDA forest inventory and analysis (FIA) for the Lake States, we developed log-log relationships between mean tree size and stand density for five cover types. Fits were good, with r2 from 0.96 to 0.98 and slopes from −0.948 to −0.995. We define an alternative index of site quality, the relative stocking index (RSI), as the ratio of a stand's measured density to that predicted using the log–log relationship for its cover type (the norm).

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Zádorová, T., O. Jakšík, R. Kodešová, and V. Penížek. " Influence of terrain attributes and soil properties on soil aggregate stability." Soil and Water Research 6, No. 3 (2011): 111–19. http://dx.doi.org/10.17221/15/2011-swr.

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&nbsp; The study on the relationship between the soil aggregates stability assessed using water stable aggregate (WSA) index and the selected terrain and soil properties was performed on a morphologically diverse study site in Chernozem soil region of Southern Moravia. Soil analyses and detailed digital elevation model processing were the main methods adopted in the study. The soil structure stability is negatively influenced by the soil material removal from the steep parts of the back-slope and re-deposition of the mineral loess material at the base of the slope. The highest aggregates s

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Oktavianti, Rina, Jabang Nurdin, and Henny Herwina. "Komunitas Collembola pada Hutan Konservasi dan Perkebunan Sawit di Kawasan PT. Tidar Kerinci Agung (TKA), Sumatera Barat." JURNAL BIOLOGI UNAND 5, no. 1 (2018): 16. http://dx.doi.org/10.25077/jbioua.5.1.16-24.2017.

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The research about composition and structure of Collembola community was conducted at TKA company area, west Sumatra. Collembola were collected at oil palm plantation, conservasion forest and forest edge sites (between conservation forest and plantation area) by survey method with systematic random sampling for collembolla in litter and soil. A total of four Collembola species that belonging to 2 orders, 3 families, 4 genera and 57 individuals was collected. The density of Collembola in litter at conservation forest site was higher than density of Collembola at oil palm plantation site meanwhi

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Marquis, F., and D. Paré. "The role of permanent site factors in the assessment of soil treatment effects: A case study with a site preparation trial in jack pine plantations on glacial outwashes." Canadian Journal of Soil Science 89, no. 1 (2009): 81–91. http://dx.doi.org/10.4141/cjss06044.

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In silvicultural trials, the confounding influence of permanent soil properties is assumed to be minimal. A covariance analysis using total elemental concentrations of parent material (geochemistry) and soil particle size distribution (texture) was used to understand the role that these variables could play in tree growth and foliar nutrient status, and in the growth response to site preparation of 16- to18-yr-old jack pine plantations growing on seemingly homogeneous glacial outwash deposits. Three treatments were tested in a replicated design: direct plantation, and site preparation with TTS

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