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Journal articles on the topic 'Permanent experimental plots'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Ratchford, Kevin. "Rice Water Weevil Control, 1986." Insecticide and Acaricide Tests 12, no. 1 (1987): 265. http://dx.doi.org/10.1093/iat/12.1.265.

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Abstract Rice was planted 22 May on loessial silt loam soil at the Macon Ridge Branch of the Northeast Research Station. The experimental design was a randomized complete block design with 4 replications. All plots were sampled for root feeding larvae by taking 3 soil cores (9 cm dia × 10 cm deep) from drills rows, once a week, for 4 weeks after establishing permanent flood. Cores were processed by washing through a #40 mesh sieve and floating the larvae out in a saline solution. Granular insecticides were applied by hand shaker to plots measuring 9 square meters. Preplant treatments were inco

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Gagić-Serdar, Renata, Tomislav Stefanović, Goran Češljar, et al. "Air pollution impact assessment and monitoring, its effects on the forest ecosystems in the territory of the Republic of Serbia in 2015." Sustainable Forestry: Collection, no. 71-72 (2015): 39–61. http://dx.doi.org/10.5937/sustfor1571039g.

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In 2015 research observations of permanent monitoring of forests in the Republic of Serbia on permanent experimental plots were carried out in accordance with the Instructions of the International Cooperative Programme on Forest Condition Monitoring and data were collected for the necessary analyses. Experimental fields (FSP) are systematically arranged in 16x16 km or 4 x 4 km grid systems. Basic parameters evaluated in the plots were: presence of pests, phytopathological changes, as well as of other types and causes of forest damage. The aim of this paper was to correlate these factors that a

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3

Lebedev, Aleksandr V., Aleksandr V. Gemonov, Sergey N. Volkov, et al. "Features of natural renewal in pine-linden and larch-linden forest stands in Moscow." RUDN Journal of Agronomy and Animal Industries 18, no. 3 (2023): 373–84. http://dx.doi.org/10.22363/2312-797x-2023-18-3-373-384.

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Problems of natural renewal of tree species (pine-linden and larch-linden stands) were studied in the territory of Forest experimental station, Moscow Timiryazev Agricultural Academy. Natural regeneration of tree species is one of the most urgent problems of forestry and forest park management in urban areas. Reforestation refers to complex natural processes that affect all components of biogeocenoses. The purpose of the research was to study natural regeneration in mixed stands in Moscow. Methods and results of field surveys of forest stands in permanent trial plots were described. The forest

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Hébert, Rémi. "Méthodologie pour l'analyse des données forestières historiques : le cas de la forêt expérimentale du Lac Édouard, Québec." Forestry Chronicle 80, no. 4 (2004): 469–72. http://dx.doi.org/10.5558/tfc80469-4.

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Permanent sampling plots in experimental forests have generated large quantities of data over the past decades. Methods used to collect certain of these data have often varied over the course of the sampling. The objective of this study was to develop a process to evaluate sampling differences in historical forest data. The proposed approach is to: (1) examine available data and seek out the missing ones in archives of the concerned organizations; (2) regroup data by inventory periods; (3) search for the sampling methodology in each of the different inventory periods; and (4) evaluate the impa

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D'Eon, Steve. "A retrospective look at 80 years of silvicultural research at Petawawa." Forestry Chronicle 75, no. 3 (1999): 385–88. http://dx.doi.org/10.5558/tfc75385-3.

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Canada's oldest forest research plot was laid out at Petawawa in 1918. Since then, hundreds of researchers have established plots, gathered data, and published results utilizing the Petawawa Research Forest. Many of the projects and plots were designed as long-term studies meant to endure and be re-measured over the decades. Although control plots were utilized, these early experiments were established prior to the benefits of repetition and experimental design. Later experiments were installed with three or more reps and factorial designs strengthening their analytical capabilities. Research

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Way, M. O., and R. G. Wallace. "Control of Rice Water Weevil with Dimilin, 1989." Insecticide and Acaricide Tests 15, no. 1 (1990): 273. http://dx.doi.org/10.1093/iat/15.1.273a.

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Abstract The experiment was conducted at the Texas A&M University Agricultural Research and Extension Center at Beaumont. The experimental design was a randomized complete block with 5 treatments and 4 replicates. Each plot was 6 × 13 ft surrounded by a metal barrier to prevent contamination among plots. Plots were fertilized with urea at 110.5 lb N/acre and broadcast seeded at 100 lb seed/acre 10 May. Plots were flooded 11 May and drained 13 May. Thiobencarb at 4 lb(AI)/acre was applied 16 May. Rice emerged 18 May. Plots were flooded 26 May and drained 28 May. Propanil at 3 lb (AI)/acre a

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Zachara, Tadeusz, and Wojciech Gil. "The damage caused by wind in middle-aged Scots pine stands on permanent thinning experimental plots." Folia Forestalia Polonica 63, no. 4 (2021): 300–307. http://dx.doi.org/10.2478/ffp-2021-0030.

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Abstract In July 2002, the very strong hurricane appeared in northern Poland, which caused destruction of forest cover of area more than 10,000 ha. The permanent thinning research plot in a 53-year-old pine stand located in Myszyniec forest district (150 km north of Warsaw) was lying on the edge of damaged area. The following treatments were tested on this plot: 1) control plot (without thinning); 2) schematic cut in 20-year-old stand, selective thinning to 40 years, then thinning from below; 3) schematic cut in 20-year-old stand, then selective thinning; 4) selective thinning in young stand (

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Tadeusz, Zachara, and Gil Wojciech. "The damage caused by wind in middle-aged Scots pine stands on permanent thinning experimental plots." FOLIA FORESTALIA POLONICA, SERIES A – FORESTRY 63, no. 4 (2021): 300–307. https://doi.org/10.2478/ffp-2021-0030.

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In July 2002, the very strong hurricane appeared in northern Poland, which caused destruction of forest cover of area more than 10,000 ha. The permanent thinning research plot in a 53-year-old pine stand located in Myszyniec forest district (150 km north of Warsaw) was lying on the edge of damaged area. The following treatments were tested on this plot: 1) control plot (without thinning); 2) schematic cut in 20-year-old stand, selective thinning to 40 years, then thinning from below; 3) schematic cut in 20-year-old stand, then selective thinning; 4) selective thinning in young stand (20–

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Podhrázská, J., J. Uhlířová, and S. Hejduk. "Evaluation of crop effects on runoff and washout of soil from the surface of agricultural land." Soil and Water Research 4, No. 4 (2009): 142–48. http://dx.doi.org/10.17221/12/2009-swr.

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Measurements of the runoff intensity (i.e. its volume and amounts of washed out soil particles) were performed on experimental plots with the slope gradient of 5&deg; within the period of 2004&ndash;2008. Experimental plots were covered with different types of crops: crops with wide rows (maize, potatoes), no row crops (cereals) and permanent grasslands (both extensively and intensively managed). The main objective of this study was to quantify the effect of individual crops on the reduction of runoff and erosion transport (i.e. washout) of soil from the surface of agricultural land. D

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Beker, Cezary. "Znaczenie stałych powierzchni doświadczalnych dla leśnictwa i ochrony przyrody." Zarządzanie ochroną przyrody w lasach XV (July 31, 2024): 41–46. http://dx.doi.org/10.5604/01.3001.0054.7141.

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Conducting rational forest management, with an emphasis on the protective aspects, necessitates informed breeding and economic decisions. This underscores the need for continuous monitoring of environmental factors affecting tree and stand development, health, structure, and productivity. The most effective way of tracking changes in forest ecosystems is through interdisciplinary research conducted on permanent experimental plots. Current studies on these plots aim to elucidate the impact of habitat and abiotic, biotic and anthropogenic factors on the forest. Given the multifaceted nature of o

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Dubenok, N. N., and A. V. Lebedev. "Dynamics of stand indicators of pine plantations according to the data of long-term observations." Rossiiskaia selskokhoziaistvennaia nauka, no. 4 (August 15, 2023): 48–51. http://dx.doi.org/10.31857/s2500262723040099.

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The purpose of the study is to study the dynamics of stand indicators (average height and diameter, the basal areas and stock) of pine forest plantations of different initial density over a 120-year period based on long-term observations on permanent sample plots. The object of the study was pine plantations on permanent trial plots of the Forest Experimental Station (Moscow). Course of Growth tables are among the simplest models that reflect the change in stand indicators of a collection of forest stands. A comparison of the growth and yield of forest stands on permanent test plots was carrie

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Silva, Katia Emidio da, Sebastião Venâncio Martins, Carlos Antônio Alvares Soares Ribeiro, Nerilson Terra Santos, and Celso Paulo de Azevedo. "STRUCTURE OF 15 HECTARES PERMANENT PLOTS OF TERRA FIRME DENSE FOREST IN CENTRAL AMAZON." Revista Árvore 40, no. 4 (2016): 603–15. http://dx.doi.org/10.1590/0100-67622016000400004.

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ABSTRACT Terra Firme dense forest occurs in 65% of the Amazonian region and is characterized by the high diversity of plant species and high occurrence of rare plant species. The objective of this work was to analyze the horizontal structure of 15 hectares of plots, randomly chosen from a set of 400 ha of permanent plots situated at the Experimental Site of Embrapa, Manaus, Amazonas State, Brazil. All individuals with DBH ≥ 10 cm were identified at the level of species in 2005. The VI values (Values of importance) were separated in classes of range with one (01) standard deviation and the indi

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Andrasev, Sinisa, Martin Bobinac, and Nikola Susic. "Research of black locust and common hackberry stands’ structure in Subotica-Horgos sands and proposed silvicultural measures aimed at their improvement." Bulletin of the Faculty of Forestry, no. 125 (2022): 27–56. http://dx.doi.org/10.2298/gsf2225027a.

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The paper analyzes the elements of the stand structure and proposes silvicultural measures to improve conditions in the stand of black locust (Robinia pseudoacacia L.) and common hackberry (Celtis occidentalis L.) aged 28 years in Subotica-Horgos sands. The research was performed on three permanent experimental plots on which selective thinning (T1 and T2) was performed experimentally in two plots, while one was left as a control plot (C).Initially, 528 trees for tending per hectare were selected in the studied age, of which 448 black locust and 80 common hackberry trees per hectare were selec

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Way, M. O., and R. G. Wallace. "Control of Rice Water Weevil, 1988." Insecticide and Acaricide Tests 14, no. 1 (1989): 268–69. http://dx.doi.org/10.1093/iat/14.1.268a.

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Abstract This field experiment was conducted on clay soil at the Texas A&M University Agricultural Research and Extension Center at Beaumont. The experimental design was a randomized complete block with 5 treatments and 4 replicates. Each plot was 6 by 13 ft and surrounded by a metal barrier to prevent contamination among plots. Plots were fertilized 12 Apr with urea at 68 lb nitrogen/acre. Rice was broadcast seeded in each plot 12 Apr at 100 lb seed/acre. The plots were flooded 15 Apr and drained 24 h later. Thiobencarb at 4 lb (AI)/acre was applied 20 Apr as a preemergence herbicide. Ric

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Way, M. O., and R. G. Wallace. "Control of Rice Water Weevil With Fipronil in A Drill-Seeded, Delayed Flood Culture–Eup Study, 1996." Arthropod Management Tests 22, no. 1 (1997): 297. http://dx.doi.org/10.1093/amt/22.1.297.

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Abstract The experiment was conducted at the TAMU Agricultural Research and Extension Center at Beaumont and was a non-replicated experimental use permit (EUP) study with 4 treatments. Plot size was 3 acres. On 26 Mar, plots were fertilized by air with 55-40-0 at 56 lb nitrogen/acre. Fertilizer was in-corporated with a “Do-all” on the same day. On 27 Mar, a designated plot was treated with Fipronil 80 WG at 0.0325 lb (AI)/acre using a large (11 nozzle, tip size80015, 50 mesh screens), 2 person, hand-held spray boom pressurized with CO2. Final spray volume was 10.6 gpa. Following application, t

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Way, M. O., and R. G. Wallace. "Control of Rice Water Weevil, 1988." Insecticide and Acaricide Tests 14, no. 1 (1989): 268. http://dx.doi.org/10.1093/iat/14.1.268.

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Abstract The experiment was conducted at the Texas A&M University Agricultural Research and Extension Center at Beaumont. The experimental design was a randomized complete block with 8 treatments and 4 replicates. Each plot was 8 by 16 ft and surrounded by a metal barrier to prevent contamination between plots. Plots were fertilized with urea at 68 lb nitrogen/acre and drill seeded at 100 lb seed/acre 14 Apr. Distance between rows was 7 inches. The plots were flooded 15 Apr and drained 24 h later. Thiobencarb at 4 lb (AI)/acre was applied 20 Apr. Rice emerged 24 Apr. Plots were flush irrig

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Ivojević, Sead, Osman Mujezinović, Damir Prljača, and Kenan Zahirović. "REGENERATION OF FIR IN DIFFERENTLY STRUCTURED STANDS OF BEECH AND FIR FORESTS (WITH SPRUCE) ON BJELAŠNICA." Radovi Šumarskog fakulteta Univerziteta u Sarajevu 48, no. 2 (2018): 1–16. http://dx.doi.org/10.54652/rsf.2018.v48.i2.43.

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UDK: 630*23:582.475(234.422 Bjelašnica) This document includes research in regeneration of fir in differently structured stands of beech and fir forests (with spruce) on mountain Bjelašnica near Sarajevo. Analysis of fir regeneration in differently structured stands was done by comparison of numbers of units of young fir, per growth category, and by total number of young fir at canopy density degree of 0.7 (0.60 – 0.79) and 0.9 (0.80 – 1.00), and by mixture ratio – share of fir (spruce) 0.7 (60 – 79 %) and 0.9 (80 – 100 %). Comparisons were done between virgin forest stands of beech and fir (w

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Peereman, Jonathan, James Aaron Hogan, and Teng-Chiu Lin. "Landscape Representation by a Permanent Forest Plot and Alternative Plot Designs in a Typhoon Hotspot, Fushan, Taiwan." Remote Sensing 12, no. 4 (2020): 660. http://dx.doi.org/10.3390/rs12040660.

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Permanent forest dynamics plots have provided valuable insights into many aspects of forest ecology. The evaluation of their representativeness within the landscape is necessary to understanding the limitations of findings from permanent plots at larger spatial scales. Studies on the representativeness of forest plots with respect to landscape heterogeneity and disturbance effect have already been carried out, but knowledge of how multiple disturbances affect plot representativeness is lacking—particularly in sites where several disturbances can occur between forest plot censuses. This study e

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Feshchenko, Roman, Yaroslav Kovbasa, Raisa Matashuk, Svitlana Bilous, Olena Naumovska, and Andrii Bilous. "Current increment of ecosystem services in permanent sample plots within the forest stands of the Feofania park-monument." Ukrainian Journal of Forest and Wood Science 14, no. 4 (2023): 88–102. http://dx.doi.org/10.31548/forest/4.2023.88.

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Despite the fact that forests in nature conservation areas are of mature and over-mature age, they have a leading role in the production of ecosystem services, in particular in ensuring biodiversity. In the typical sense, at the mature and over-mature age of stands, the growth of live biomass and carbon sequestration almost stops, and the death of trees leads to a negative change in the stock. The purpose of the study is to substantiate the ability of over-mature forests to accumulate live biomass under the condition of the formation of multi-tiered and different-age stands. The research was c

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Zachara, Tadeusz. "The influence of different thinning methods on dominance coefficients of future crop trees in even-aged Scots pine stands." Forest Research Papers 75 (1) (March 1, 2014): 31–45. https://doi.org/10.2478/frp-2014-0004.

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The research aim was to evaluate the influence of different thinning methods on future crop tree growth. Investigations were conducted on permanent Scots-pine experimental plots, established in 1960s and 1970s in Kozienice, Łąck, Parciaki and Janów Lubelski Forest Districts. To assess the response to thinning of future crop trees, their dominance coefficients were used. These are defined as quotients for each given future crop tree diameter and average stand diameter (WP1), the average dominant layer diameter (WP2) and the average diameter of 100 thickest trees per hectare (WP3). The di

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Lebedev, Aleksandr. "Dynamic model of the growth and yield of pine stands (Pinus sylvestris L.) in the Unzhensky Lowland." Forestry Engineering Journal 14, no. 3 (2025): 127–51. https://doi.org/10.34220/issn.2222-7962/2024.3/8.

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Scots pine is one of the main forest-forming species in the Kostroma region, therefore it is necessary to have tools that allow one to make informed decisions on managing the forest growing process, planning forest management, designing forest management activities and increasing the efficiency of forest stands performing environmental functions. The purpose of the study is to develop a dynamic model of growth and yield of pine stands in the Unzhensky Lowland (Kostroma region) based on repeated observations on permanent trial plots. The data for modeling the growth and yield of pine stands wer

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Balcerkiewicz, Stanisław, and Grażyna Pawlak. "Dynamics of a small clearing flora in the biodiversity context." Biodiversity: Research and Conservation, no. 1-2 (June 30, 2006): 114–22. https://doi.org/10.14746/biorc.2006.1-2.26.

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The present study forms a part of a multifaceted research project exploring the rate and directions of spontaneous dynamics of vegetation cover after the cessation of agricultural use, as well as the effects of anthropogenic modification of this process through controlled mowing and ploughing. Results are based on data from the experimental site located in the Wielkopolski National Park and consisting of 135 permanent 5 m x 5 m square plots. Observations in all plots were regularly repeated at 5 year intervals and, in selected plots, at additional times. The documentation covers the period fro

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Balić, Besim, Aida Ibrahimspahić, Ćemal Višnjić, and Vahid Hadžiabdić. "REGRESSION MODEL FOR ASSESSMENT OF VOLUME OF MERCHANTABLE WOOD OF EVEN-AGED NOT-TENDED FOREST PLANTATIONS OF SCOTS PINE ON CARBONATE SUBSTRATES IN B&H." Radovi Šumarskog fakulteta Univerziteta u Sarajevu 49, no. 1 (2021): 20–33. http://dx.doi.org/10.54652/rsf.2019.v49.i1.23.

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UDK: 630*52:519.233.5]:582.475(497.6) As the result of sporadic afforestation of not-grown forest land in the past, today in B&H we have significant areas of even-aged forest plants of Scots pine of different ages. Estimate of yield capabilities of habitats/sites of these stands is one of very real issues in even-aged management planning for this tree species. In order to get the clear idea on the value of yield of even-aged stands, it is necessary to conduct long-term researches on permanent experimental plots. Considering that for the results of those researches it is necessary to

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Mašíček, Tomáš, F. Toman, and M. Vičanová. "Comparison of infiltration capacity of permanent grassland and arable land during the 2011 growing season." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 60, no. 6 (2012): 257–66. http://dx.doi.org/10.11118/actaun201260060257.

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The aim of this paper was to compare the rate of infiltration and cumulative infiltration in permanent grassland (PG) and in arable land over the course of the 2011 growing season. The measurement of water infiltration into soil was conducted via ponded infiltration method based on the use of two concentric cylinders in field conditions. Kostiakov equations were applied to evaluate the ponded infiltration. Based on field measurements, the dependence of infiltration rate (v) on time (t) was determined and also the dependence of cumulative infiltration (i) on time (t). In order to determine phys

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Bernhardt, J. L. "Control of Rice Water Weevil with Dimilin, 1996A." Arthropod Management Tests 22, no. 1 (1997): 288. http://dx.doi.org/10.1093/amt/22.1.288.

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Abstract The experimental design was a RCB with 4 replications. Plot size was 9 rows (7 inch spacing) by 20 ft. Each plot was bound by levees. Rice was drill-seeded in Crowley silt loam at 90 lb/acre on 3 May and emerged on 12 May. Propanil and Bolero at 4 and 2 lb (AI)/acre, respectively, were applied for weed control on 29 May. Nitrogen was applied in a 3-way split of 75 lb N/acre as urea on 12 Jun and 30 lb N/acre on 5 and 14 Jul. Permanent flood was established on 12 Jun. All treatments of Dimilin were made with a CO2-pressurized back-pack sprayer at 18 gpa. Furadan 3G was applied 10 d aft

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Дубенок, Н. Н., А. В. Лебедев, and С. А. Чистяков. "Dynamics of Silvicultural and Taxation Indicators of Forest Stands on Permanent Sample Plots in Native Spruce Forests of the Kologrivsky les Nature Reserve." Лесохозяйственная информация, no. 2 (June 14, 2024): 37–46. http://dx.doi.org/10.24419/lhi.2304-3083.2024.2.03.

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Приведены особенности лесоводственно-таксационных показателей древостоев на постоянных пробных площадях в коренных ельниках заповедника «Кологривский лес» (Костромская обл.). Исследования проведены на 5 пробных площадях (0,25–1,0 га), заложенных в 1981–1984 гг. сотрудниками Костромской лесной опытной станции и Московского государственного университета леса в памятнике природы «Кологривский лес». С 2014 по 2019 г. проведены работы по восстановлению этих пробных площадей. По данным наблюдений на пробных площадях проанализирована динамика лесоводственно-таксационных показателей (средние высота и

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Way, M. O., and R. G. Wallace. "Control of Rice Water Weevil with Diflubenzuron–Eup Experiment,1996." Arthropod Management Tests 22, no. 1 (1997): 300. http://dx.doi.org/10.1093/amt/22.1.300.

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Abstract The experiment was conducted at the TAMU Agricultural Research and Extension Center at Beaumont and was a non-replicated experimental use permit (EUP) study with 4 treatments. Plot size was 4.77 acres. One d before planting, plots were fertilized by air with 55 lb nitrogen and 40 lb phosphorus/acre. Fertilizer was incorporated with a “do-all” On 23 Mar plots were drill planted (7.5 inches between rows) at 90 lb seed/acre. Soil type was Labelle. Seed was treated with Apron-FI, Vitavax 200 Flowable, Zinc Starter, and Release LC. After planting, plots were “rolled” to help cover seed and

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C, UDAYASOORIAN, and PARAMASIVAM . "CHANGES IN AVAILABLE NPK STATUS AFTER 8 YEARS OF CONTINUOUS MANURING AND FERTILIZATION IN RICE-RICE CROPPING SYSTEM." Madras Agricultural Journal 78, March Augest (1991): 204–6. http://dx.doi.org/10.29321/maj.10.a01846.

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The influence of long term fertilization with organic manure and inorganic fertilizers under Rice-Rice cropping system on the available NPK status was investigated in the permanent manurial experimental plots of Agricultural College farm, Madurai. Continuous addition of FYM along with NPK fertilizers for eight years resulted in higher available N and P content while addition of compost along with K fertilizer resulted in higher available K content. Accumulation of more of available NPK was observed in the surface soil than sub surface soil. Addition of Nhad a depressive effect on the available

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Badalíková, Barbora, and Jaroslava Bartlová. "Effect of Various Compost Doses on the Soil Infiltration Capacity." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 62, no. 5 (2014): 849–58. http://dx.doi.org/10.11118/actaun201462050849.

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In the years 2008–2012, the infiltration capacity was monitored in the different sites, viz. on the arable land and permanent grassland. In the permanent grassland site the soil was characterised as Leptic Cambisol, loamy sand with the depth of the top layer 0.20 m while on the arable land, it was classified as Eutric Cambisol, sandy loam with the maximum depth of the topsoil humus horizon 0. 40 m. Experimental variants with different doses of incorporated compost were as follows: Variant 1 –without compost incorporation, Variant 2 – compost incorporated in the dose of 80 t.ha−1, Variant 3 – c

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Stefanović, Tomislav, Renata Gagić-Serdar, Ilija Đorđević, et al. "Studies of defoliation on ICP sample plots level I in Republic of Serbia." Sustainable Forestry: Collection, no. 75-76 (2017): 41–56. http://dx.doi.org/10.5937/sustfor1775041s.

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Project of forests condition monitoring (ICP Forests) operates as an international European project in which, on grid of ICP sample plots (bioindication points) condition of forests has been monitored annually in continuity, including recording data on defoliation with evidencing any damage to the trees. The main goal of the program is monitoring of condition of forests on a permanent, representative surfaces, arranged in a systematic grid distributed on the territory of of Europe. This paper analyzes the data on defoliation as part of the results of the forest conditions monitoring on ICP sam

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Lebedev, Aleksandr, Aleksandr Gemonov, and Olga Koryakina. "Dynamic growth model for oak stands in Moscow, Russia." E3S Web of Conferences 462 (2023): 02033. http://dx.doi.org/10.1051/e3sconf/202346202033.

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The most objective information about the state of Moscow’s forests is provided by long-term observation data on permanent trial plots. Such data makes it possible to identify changes in forest stands under the influence of recreationists, environmental pollution, and climate change. Long-term observational data are particularly valuable in modeling forest stand growth and productivity. The goal of the study is to develop a dynamic model of the growth of oak stands in Moscow based on long-term observation data. The modelling data were obtained from 7 plots of the permanent sample plot network e

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Kuzmichev, V. V. "LIMIT LINE “AVERAGE DIAMETER - AVERAGE DISTANCE BETWEEN TREES” IN STANDS." Prirodoobustrojstvo, no. 5 (2024): 119–26. https://doi.org/10.26897/1997-6011-2024-5-119-126.

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The degree of space occupancy with woody plants has a certain limit associated with their biological characteristics and the level of soil fertility. The value of relative density in our country serves as a criterion for determining the intensity of thinning, while abroad the “index of forest density is used”. The purpose of the study is to substantiate the limit line “average diameter – average distance between trees” in stands of the main forest-forming species according to the data of long-term observations on permanent sample plots. The materials for the study were measurement data on perm

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Hynynen, Jari. "Predicting tree crown ratio for unthinned and thinned Scots pine stands." Canadian Journal of Forest Research 25, no. 1 (1995): 57–62. http://dx.doi.org/10.1139/x95-007.

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A nonlinear model that yields logical predictions for tree crown ratio is presented. The model is based on data from permanent experimental plots located in even-aged Scots pine (Pinussylvestris L.) stands in southern and central Finland. Regressor variables in the model are stand dominant height, stand basal area, tree diameter, and tree height. The effect of thinning on tree crown ratio is modelled by incorporating a thinning response variable into the model. Thinning effect is dependent on thinning intensity and time elapsed from thinning, the latter of which is represented by the differenc

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Hart, V., M. Nentvichová-Hartová, and P. Tauchman. "Analysis of herbicide effects on Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) natural regeneration." Journal of Forest Science 56, No. 5 (2010): 209–17. http://dx.doi.org/10.17221/77/2009-jfs.

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Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) natural regeneration under parent stand after weed suppression was investigated in the area of the Training Forest Enterprise in Kostelec nad Čern&yacute;mi lesy. The study evaluates two measurements made in a two-year interval. The parent stand, where Douglas fir grows in mixture with our domestic tree species, is one of the oldest and most productive stands at the Training Forest Enterprise in Kostelec nad Čern&yacute;mi lesy. Herbicides for the control of weeds were applied onto three permanent experimental plots under the parent st

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Andrašev, Siniša, Martin Bobinac, Tomislav Dubravac, and Nikola Šušić. "Diameter Structure Changes in the Pre-Maturing Black Locust and Common Hackberry Stand in the Subotica-Horgoš Sands under the Influence of a Late Thinning." South-east European forestry 11, no. 2 (2020): 111–26. http://dx.doi.org/10.15177/seefor.20-13.

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In this paper, a change of diameter structure in a pre-maturing stand of black locust and common hackberry under the influence of a late thinning is analysed. The research is based on three permanent experimental plots and two measurements of diameters in a five-year period. One of the plots is a control plot and two plots are experimental, where the thinning was carried out in a stand 28-years old, with the thinning intensity of 28.9–30.6% of the initial density, approximately evenly distributed across diameter classes. In the investigated stand common hackberry came from the neighbouring are

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Дубенок, Н. Н., А. В. Лебедев, С. Н. Волков, А. В. Гемонов, В. М. Градусов, and Г. М. Миронова. "160 Years of the Forest Experimental Station of the Timiryazev Agricultural Academy (1862-2022)." Лесохозяйственная информация, no. 4 (December 16, 2022): 5–14. http://dx.doi.org/10.24419/lhi.2304-3083.2022.4.01.

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Лесная опытная дача Российского государственного аграрного университета - МСХА имени К.А. Тимирязева является неотъемлемой частью становления и развития экспериментального лесоводства в России. Первые работы по изучению лесных насаждений начались здесь в 1862 г. В 2022 г. исполняется 160 лет со времени первого обустройства лесного массива и закладки первых постоянных пробных площадей, поэтому цель исследования - подведение основных итогов научно-исследовательских работ в Лесной опытной даче РГАУ - МСХА за 160 лет непрерывных наблюдений (1862-2022 гг.). С 1862 г. на опытной даче было заложено 2

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Czerepko, Janusz. "Changes in the structure of tree stands on bog habitats in the Bialowieza forest." Folia Forestalia Polonica, Series A - Forestry 51(1) (March 1, 2010): 33–43. https://doi.org/10.5281/zenodo.30619.

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The analyses of 4 permanent study plots located in the Białowieża forest (NE Poland, at 52º43´ N, 23º50´ E) were carried out 4 times, first time in 1973 or 1974 and next in 1985, 1998, 2008. The paper presents the results of a long–term study on natural forest dynamics in two forest communities: raised-bog pine forest of the association Ledo-Sphagnetum magellanici Sukopp 1959 em. Neuhäusl 1969 and transitional bogs represented by the boreal spruce forest Sphagno girgensohnii-Piceetum Polak. 1962. On each measurement date the DBH of all trees were recognized. At

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Целиков, Глеб Владимирович, and Николай Васильевич Выводцев. "MODELING THE GROWTH OF FOREST STANDS ON THE DATA OF STATE FOREST INVENTORY." Вестник Бурятской государственной сельскохозяйственной академии имени В. Р. Филиппова, no. 4(57) (December 20, 2019): 45–50. http://dx.doi.org/10.34655/bgsha.2019.57.4.007.

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В статье описан метод составления таблиц хода роста. Экспериментальным материалом послужили постоянные пробные площади, заложенные при проведении государственной инвентаризации лесов в Дальневосточном лесном районе. Ранее таблицы хода роста строились по данным пробных площадей, точность которых при определении запаса не превышала 10-15%. При этом значительная часть разработанных нормативов носила локальный характер. Современные лесные насаждения в процессе естественного роста, антропогенного влияния в большинстве случаев не укладываются в заданные ранее границы. Заложенные в нормативы ошибки в

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Junker, Robert R., Maximilian Hanusch, Xie He, et al. "Ödenwinkel: an Alpine platform for observational and experimental research on the emergence of multidiversity and ecosystem complexity." Web Ecology 20, no. 2 (2020): 95–106. http://dx.doi.org/10.5194/we-20-95-2020.

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Abstract. Studies on ecological successions have a long tradition and have strongly contributed to the understanding of community assembly, niche theory, and ecosystem structure and functionality. Reports on ecological successions are however mostly restricted to one or two taxonomic groups, neglecting the mutual influences and dependencies between multiple taxonomic groups that are the building blocks of diverse communities. We introduce the Alpine research platform Ödenwinkel to promote observational and experimental research on the emergence of multidiversity and ecosystem complexity. We es

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Sousa, Ricardo Silva de, Luís Alfredo Pinheiro Leal Nunes, Francisco de Alcântara Neto, Henrique Antunes de Souza, and Ademir Sérgio Ferreira de Araújo. "Physical soil properties after seven years of composted tannery-sludge application." Acta Scientiarum. Agronomy 45 (August 22, 2023): e60748. http://dx.doi.org/10.4025/actasciagron.v45i1.60748.

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This study was performed to investigate the effects of composted tannery sludge (CTS) on the physical properties of tropical sandy soil after seven years of CTS application. CTS was applied to a Fluvisol at five rates (0.0, 2.5, 5.0, 10.0, and 20.0 Mg ha-1) in experimental plots (sized 20 m2) with four replications. Water infiltration into the soil was determined in the field with the concentric-ring infiltrometer method. Bulk density, total porosity, macroporosity, and microporosity were determined in the soil samples. The permanent CTS application altered the physical properties of the soil

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Chinea, Jesus D. "Changes in the herbaceous and vine communities at the Bisley Experimental Watersheds, Puerto Rico, following Hurricane Hugo." Canadian Journal of Forest Research 29, no. 9 (1999): 1433–37. http://dx.doi.org/10.1139/x99-108.

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While herbaceous species and vines constitute a minor portion of the biomass in tropical closed forest ecosystems, they account for a substantial portion of the diversity of these ecosystems and become more conspicuous after natural disturbances. This study describes the changes in abundance and diversity of the herbs and vines during 5 years following Hurricane Hugo at the Bisley Experimental Watersheds, Puerto Rico. The cover of herbs, ferns, and vine species was sampled within a 5-m2 area in 25 randomly chosen circular permanent plots within the 13 ha of these watersheds. Sampling was done

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Wédjangnon, Adigla Appolinaire, Yvon-Carmen H. Hountondji, and Christine A. I. Nougbodé Ouinsavi. "Assessing the Landscape Pattern and Population Status of the Timber Species Mansonia altissima A. Chev. For Restoration Purposes in Moist Semi-Deciduous Forest." Journal of Landscape Ecology 13, no. 2 (2020): 14–31. http://dx.doi.org/10.2478/jlecol-2020-0008.

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AbstractMansonia altissima A. Chev., a redwood producer species in tropical Africa, occurs as one small, isolated population in a highly anthropized landscape in Republic of Benin. We accessed the landscape pattern and population status to inform restauration action for the species. We established 20 one-ha permanent plots divided in 320 subplots (25 m × 25 m) in-situ and counted and measured M. altissima plants with diameter ≥ 1cm at base and 1.30 m above ground (DBH) in February 2017, 2018 and 2019. Based on the main disturbance factors, such as fire, human-caused damage to seedlings, harves

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Silva, P. S. L., T. M. S. Cunha, R. C. Oliveira, K. M. B. Silva, and O. F. Oliveira. "Weed control via intercropping with gliricidia: II. corn crop." Planta Daninha 27, no. 1 (2009): 105–12. http://dx.doi.org/10.1590/s0100-83582009000100014.

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A reduction in herbicide use is one of modern agriculture's main interests and several alternatives are being investigated with this objective, including intercropping. Gliricídia (Gliricidia sepium) mulch has no allelopathic effect on corn or beans but significantly decreased the population of some weed species. The objective of this study was to evaluate green ear and grain yield in corn cultivars as a response to weed control achieved via intercropping with gliricidia. A completely randomized block design with five replicates and split-plots was used. Cultivars AG 1051, AG 2060, BRS 2020, a

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Bernhardt, J. L. "Control of Rice Water Weevil with Selected Insecticides, 1997." Arthropod Management Tests 23, no. 1 (1998): 260–61. http://dx.doi.org/10.1093/amt/23.1.260a.

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Abstract The experimental design was a RCB with 6 treatments and 4 replications. Plot size was 9 rows (7-inch spacing) by 20 ft. Each plot was bound by levees. Foundation seed rice was treated with fipronil 75 FS by Celpril Industries (Manteca, CA). Treated and untreated rice was drill seeded by Crowley silt loam at 90 lb/acre on 13 May and emerged between 24 and 28 May. Cool, rainy weather extended the emergence period and contributed to 5 to 15% stand reduction in plots. Propanil (Stam M4) and thiobencarb (Bolero 8 E) at 3 and 2 lb (AI)/acre, respectively, were applied for weed control on 12

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Malysheva, Nataliya V., Tatiana A. Zolina та Andrey N. Filipchuk. "Запасы углерода в почвах по материалам государственной инвентаризации лесов". Lesnoy Zhurnal (Forestry Journal), № 1 (1 лютого 2025): 83–97. https://doi.org/10.37482/0536-1036-2025-1-83-97.

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The main organic carbon stocks in the predominantly boreal forests of Russia are contained in the soil pool. Quantitative estimates of soil pool carbon stocks vary considerably. This is due to the high temporal and spatial variability of the organic carbon content in soils, the lack of empirical data for a number of regions, the difference in approaches to assessing soil carbon and the density of soil horizons, the thickness of the soil layer taken into account, the inclusion of forest litter carbon stocks, the peat layer, etc. In 2020, the 1st cycle of the State Forest Inventory in Russia was

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Layne, Richard E. C., and Chin S. Tan. "Influence of Cultivars, Ground Covers, and Trickle Irrigation on Early Growth, Yield, and Cold Hardiness of Peaches on Fox Sand." Journal of the American Society for Horticultural Science 113, no. 4 (1988): 518–25. http://dx.doi.org/10.21273/jashs.113.4.518.

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Abstract Three cultivars (early, midseason, late), two ground covers (clean cultivation followed by temporary cover vs. permanent sod strips), and trickle vs. no irrigation were studied in a high-density (633 trees/ha) experimental peach orchard established in 1980 on Fox sand. Growth rate in the first 5 years was similar for all three cultivars. It was retarded up to 12% by permanent sod relative to temporary cover and enhanced up to 30% by trickle irrigation vs. no irrigation. Total marketable yields and that of large-sized fruit (>6.3 cm) were significantly influenced by cultivars in the

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Pavel, Muha Abdullah Al, Susana Barreiro, and Margarida Tomé. "The Importance of Using Permanent Plots Data to Fit the Self-Thinning Line: An Example for Maritime Pine Stands in Portugal." Forests 14, no. 7 (2023): 1354. http://dx.doi.org/10.3390/f14071354.

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Density-dependent mortality occurs in the evolution of even-aged populations when these approach crown closure age. This density-dependent mortality is regulated by the so-called “3/2 power law of self-thinning” that assumes a constant slope for the line relating the log of stand density with the log of the average tree size, the self-thinning line or maximum size–density relationship, MSDR. A good estimate of the self-thinning line is therefore an essential component to any forest growth model. Two concepts for the MSDR have emerged: (1) a static upper limit for the species; and (2) a dynamic

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Házi, Judit, Károly Penksza, András Barczi, Szilárd Szentes, and Gergely Pápay. "Effects of Long-Term Mowing on Biomass Composition in Pannonian Dry Grasslands." Agronomy 12, no. 5 (2022): 1107. http://dx.doi.org/10.3390/agronomy12051107.

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This study is focused on the vegetation of seminatural dry grasslands. These grasslands are valuable with large biodiversity; however, their long-term preservation requires regular conservation management. This report demonstrates the results of a 13-years mowing experiment, designed to suppress the spread of an unpalatable grass species, Calamagrostis epigejos. The study site was located in mid-successional grasslands, in the Western-Cserhát, near Rád, Northern Hungary. The experimental design consisted of eight permanent plots, where mowing was applied twice a year. The vegetation was sample

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Andrasev, Sinisa, and Martin Bobinac. "Regulation of space for tree growth by thinning in a poplar clone I-214 plantation with medium density." Bulletin of the Faculty of Forestry, no. 117 (2018): 9–44. http://dx.doi.org/10.2298/gsf1817009a.

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The paper deals with issues related to the regulation of the growing space of trees by thinning in poplar plantations of clone I-214, established on the best habitatat with a planting distance of 5 x 5 m, i.e. 400 trees per hectare, aged 11 years. On nine permanent experimental plots, which were formed in a random block design with three repetitions, the similarity of the growth elements of trees and plantations (H100, hL, D100, dg, N, G, V) were determined, as well as a small coefficient of variation of the number of trees between experimental plots (8.3%), indicating the homogeneity of the e

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Stoyanov, N. "Elm forests in North Bulgaria and conservation strategies." Forest Systems 13, no. 1 (2004): 255–59. http://dx.doi.org/10.5424/830.

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From the genus Ulmus, the naturally spread species in Bulgaria are Ulmus minor, U. laevis, and U. glabra. The main reason for the decreasing of the number and density of the elm populations in Bulgaria are the epyphytonic expressions of the Dutch elm disease (DED) in the 1920s and 1970s, after which the representatives of genus Ulmus today occur predominantly as solitaire trees, biogroups and rarely form stands. In connection with the preservation of the genepool of the elms after the in situ method, an inventory of their genetic resources in North Bulgaria has started in 2002. To study the va

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