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Dissertations / Theses on the topic 'Leaf area'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Back, Merri, and A. K. Dobrenz. "Increasing the Leaf Area of Alfalfa." College of Agriculture, University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/200495.

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2

Malone, Sean M. "Assessment of Soybean Leaf Area for Redefining Management Strategies for Leaf-Feeding Insects." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/29252.

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Commercially available leaf area index (LAI) meters are tools that can be used in making insect management decisions. However, proper technique must be determined for LAI estimation, and accuracy must be validated for the meters. Full-season soybean require LAI values of at least 3.5 to 4.0 by early to mid-reproductive developmental stages to achieve maximum yield potential, but the relationship between double-crop soybean LAI and yield is unknown. This research (1) evaluated minimum plot size requirements for mechanically defoliated soybean experiments using the LAI-2000 Plant Canopy Analy

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3

Duffy, Natasha Michelle. "Design limitations to potential leaf area in urban forests." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ46004.pdf.

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4

Ebodaghe, Denis Abumere. "Estimating daily green leaf area index for corn in Virginia." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/74731.

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A model to predict the daily green leaf area index (GLAI) for corn has been developed for Indiana conditions. Using daily maximum and minimum temperatures the GLAI was predicted for the vegetative stage, reproductive and grain filling stage, and the leaf senescing stage of corn. Predictions of GLAI for corn can be made on a daily basis from the day corn is planted until it is harvested for grain. The GLAI model was tested under Virginia conditions using green leaf area measurements collected from corn plants grown on Davidson silty clay loam, Davidson silty clay, and Mayodan sandy loam soils

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5

Coker, Graham William Russell. "Leaf Area Index in Closed Canopies: An indicator of site quality." Thesis, University of Canterbury. School of Forestry, 2006. http://hdl.handle.net/10092/1128.

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This study examined leaf area index (LAI) and relationships with corresponding tree growth, climate and soil characteristics across New Zealand forest plantations. The aim of this study was to determine if quick measures of projected leaf area across environmental gradients of New Zealand were an accurate indicator of site quality. Projected leaf areas of Pinus radiata D Don and Cupressus lusitanica Mills seedlings were measured using a Li-Cor LAI-2000 plant canopy analyser at 22 locations representing the soil and climatic diversity across New Zealand plantation forests. Seedlings planted at

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6

Wang, Dongdong. "Improving satellite Leaf Area Index estimation based on various integration methods." College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/9872.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2009.<br>Thesis research directed by: Dept. of Geography. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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7

Johnson, Ryan L. "Airborne remote sensing of forest leaf area index in mountainous terrain." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ49131.pdf.

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8

Johnson, Ryan L., and University of Lethbridge Faculty of Arts and Science. "Airborne remote sensing of forest leaf area index in mountainous terrain." Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2000, 2000. http://hdl.handle.net/10133/90.

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Leaf area index (LAI) provides forestry information that is important for regional scale ecological models and in studies of global change. This research examines the effects of mountainous terrain on the radiometric properties of multispectral CASI imagery in estimating ground-based optical measurements of LAI, obtained using the TRAC and LAI- 2000 systems. Field and image data were acquired summer 1998 in Kananaskis, Alberta, Canada. To account for the influence of terrain a new modified approach using the Li and Strahler Geometric Optical Mutual Shadowing (GOMS) model in 'multiple forward

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9

Winkler, Tobias. "Empirical models for grape vine leaf area estimation on cv. Trincadeira." Master's thesis, ISA-UL, 2016. http://hdl.handle.net/10400.5/13008.

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Mestrado Vinifera Euromaster - Viticulture and Enology - Instituto Superior de Agronomia - UL / Institut National D'Etudes Superieures Agronomiques de Montpellier<br>Estimating a Vineyard’s leaf area is of great importance when evaluating the productive and quality potential of a vineyard and for characterizing the light and thermal microenvironments of grapevine plants. The aim of the present work was to validate the Lopes and Pinto method for determining vineyard leaf area in the vineyards of Lisbon’s wine growing region in Portugal, with the typical local red grape cultivar Trincadeira, and

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10

Phinopoulos, Victoras Georgios. "Estimation of leaf area in grapevine cv. Syrah using empirical models." Master's thesis, ISA/UL, 2014. http://hdl.handle.net/10400.5/8631.

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Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia<br>Empirical models for the estimation of the Area of single Primary and Lateral leaves, and total Primary and Lateral Leaf Area of a shoot, are presented for the grapevine cv. Syrah (Vitis vinifera L.). The Area of single Leaves is estimated with models using the sum of the lengths of the two lateral veins of each leaf, with logarithmic transformation of both variables. Separate models are proposed for Primary and Lateral Leaves. Models based on the Lopes and Pinto (2005) method, using Mean Leaf Area multiplied by the number of Le

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11

Hailemariam, Temesgen. "Leaf area distribution and alternative sampling designs for hybrid spruce tree crowns." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ27153.pdf.

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12

Fang, Hongliang. "Improving the estimation of leaf area index from multispectral remotely sensed data." College Park, Md. : University of Maryland, 2003. http://hdl.handle.net/1903/304.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2003.<br>Thesis research directed by: Geography. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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13

Bowyer, P. "Estimating leaf area index in savanna vegetation using remote sensing and inverse modelling." Thesis, University of Salford, 2005. http://usir.salford.ac.uk/2234/.

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Leaf area index (LAI), defined as the one sided green leaf area per unit ground area, is a key parameter in ecosystem process models. Owing to the large area of the earth's surface that they occupy, savanna ecosystems represent the third largest terrestrial carbon sink. There is considerable uncertainty however, as to the functioning of these ecosystems, particularly as they respond to land cover changes. Consequently, ecosystem process models constitute one of the best methods available for investigating the effect this may have on terrestrial carbon cycling. If these models are to be used ov

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14

Chalfant, Patricia. "Responses of Grapevines to Timing and Method of Leaf Removal." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337628161.

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15

Aqeel, Abdullah Mohammad. "USING MANUAL DEFOLIATION TO SIMULATE SOYBEAN RUST: EFFECT ON GROWTH AND YIELD FORMATION." UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_diss/223.

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Field experiments were conducted in Kentucky and Louisiana in 2008 and 2009 (split-plot in a randomized complete block design with four replications) to investigate it is possible to simulate with manual defoliation the effect of soybean rust (SBR) (Phakopsora pachyrhizi Syd. and P. Syd) injury on a healthy soybean [Glycine max, (L.) Merr.] canopy, understand how defoliation affects the growth dynamics and canopy light interception, and if defoliation affectsleaf senescence and nitrogen remobilization during the seed-filling period. Two manual defoliation treatments based on changes in effecti

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16

Neumann, John A. P. "Variability in the relationship between leaf area and selected stem measures in Douglas fir." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28819.

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Variability in the relationship between tree leaf area (TLA) and selected stem measurements was examined in three Douglas-fir stands (Pseudotsuga menziesii (Mirb.) Franco, var. menziesii) that were less than 50 years-old, spaced to approximately 550 to 650 stems/ha, and differed in soil moisture and nutrients. Attention was given to the effect of mean annual ring width (MARW), cross-sectional area of the live bark (ALB - a surrogate measure of relative nutrient storage in the stem), and cross-sectional area of the most recent annual rings equal in number to the number of whorls in the live cro

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17

Bravo, Avila Catherine Heidy. "Root:Shoot Ratio and Specific Leaf Area Along an Elevational Gradient in the Peruvian Andes." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/884.

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Andean montane forests are one of the most diverse ecosystems on Earth, but are also highly vulnerable to climate change. Therefore, the link between plant distribution and ecosystem productivity is a critical point to investigate in these ecosystems. Are the patterns in productivity observed in montane forest due to species turnover along the elevational gradients? Methodological constraints keep this question unanswered. Also, despite their importance, belowground biomass remains poorly quantified and understood. I measured two plant functional traits in seedlings, root:shoot ratio and speci

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18

May, David Z. "A MULTISPECTRAL REMOTE SENSING INVESTIGATION OF LEAF AREA INDEX AT BLACK ROCK FOREST, NY." Ohio University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1157569101.

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19

Hirooka, Yoshihiro. "Evaluation of Rice Growth Characteristics Based on Non-destructive Measurements of Leaf Area Index." Kyoto University, 2016. http://hdl.handle.net/2433/215581.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第19755号<br>農博第2151号<br>新制||農||1038(附属図書館)<br>学位論文||H28||N4971(農学部図書室)<br>32791<br>京都大学大学院農学研究科農学専攻<br>(主査)教授白岩立彦, 教授奥本裕, 教授稲村達也<br>学位規則第4条第1項該当

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20

Bobeva, Albena. "Quantifying the distribution of forest functional types and forest leaf area index in the Alps." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969685106.

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21

HAGIHARA, Akio, 秋男萩原, Kazuyoshi YAMAJI, and 和義山路. "Dimension Relations of Branches in Hinoki (Chamaecyparis obtusa (Sieb. et Zucc.)Endl.)." 名古屋大学農学部付属演習林, 1993. http://hdl.handle.net/2237/8693.

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22

Thomas, Dana J. "Morphological Tradeoffs of American Chestnut (Castanea Dentata) and Co-Occurring Hardwoods in Varying Nutrient and Light Regimes." Miami University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=miami1134161439.

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23

Shah, Kushendra Narayan. "MULTI-SCALE MAPPING AND ACCURACY ASSESSMENT OF LEAF AREA INDEX FOR VEGETATION STUDY IN SOUTHERN ILLINOIS." OpenSIUC, 2013. https://opensiuc.lib.siu.edu/theses/1234.

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The increasing interest of modeling global carbon cycling during the past two decades has driven this research to map leaf area index (LAI) at multiple spatial resolutions by combining LAI field observations with various sensor images at local, regional, and global scale. This is due to its important role in process based models that are used to predict carbon sequestration of terrestrial ecosystems. Although a substantial research has been conducted, there are still many challenges in this area. One of the challenges is that various images with spatial resolutions varying from few meters to s

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24

Pfister, Lucas Federico. "Effect of canopy management practices - hedging vs curling shoot tips - on growth, yield and fruit composition of Merlot grapevines." Master's thesis, ISA, 2011. http://hdl.handle.net/10400.5/8583.

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Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia<br>A study to compare the effects of hedging and curling the shoot tips (rolling) on the last wire of the trellising system was carried out in Saint Emilion (France) on Merlot grapevines in 2011. Vines were hedged or curled when shoots were 30 – 40 cm longer than the highest wire. The effects of the two canopy management strategies on vine performance, mainly vegetative growth, disease occurrence, phenology, water status, yield components and berry composition were compared. Curled, not hedged vines presented longer main shoo

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25

Pasch, Ludwig Anselm. "The effect of leaf area to crop weight ratios on fruit quality and performance of grapevine (Vitis vinifera cv. Pinot Noir)." Master's thesis, ISA/UL, 2014. http://hdl.handle.net/10400.5/8635.

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Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia<br>Vine performance, fruit and wine composition were investigated on field grown Pinot Noir grapevines subjected to a range of leaf removal and cluster thinning treatments. Both treatments were applied in three levels (25 %, 50 % and 100 % of leaves and clusters retained, respectively) at the phenological stage of pea-size. New emerging leaves were removed as they appeared. Veraison was delayed when leaf area to fruit weight ratio (LA/Y) dropped below a certain threshold (13 cm2 g-1). On the contrary a high LA/Y ratio (> 26 cm

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26

Cardoso, Saulo Strazeio [UNESP]. "Crescimentos sucessivos de Capim-Marandu em diferentes solos submetidos à fertilização potássica." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/138912.

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27

Donaldson, Jason. "Do trees suppress grass fuel loads? : canopy cover effects in South African savannas." Bachelor's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/26376.

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Continental scale analysis of the savanna biome indicated that fire did not spread at tree canopy cover above 40%. This study investigates this relationship in a field study. It is possible that the type of tree (forest vs. savanna) may influence the amount of shade experienced by the understory and therefore this study also explores differences in LAI between congeneric pairs of forest and savanna tree species. Data were collected in two major South African savanna parks. Plots were set out to measure grass biomass in reference to canopy cover in both Kruger National Park (n=60) and the Hlu

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28

DeRose, Robert Justin. "Leaf Area Index - Relative Density Relationships in Even-Aged Abies Balsamea - Picea Rubens Stands in Maine." Fogler Library, University of Maine, 2004. http://www.library.umaine.edu/theses/pdf/DeRoseRJ2004.pdf.

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29

Norris, Patricia E. "Factors influencing the adoption of soil conservation practices in Virginia's Piedmont Bright Leaf Erosion Control Area." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/104521.

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30

Meek, David B. "The Relationship Between Leaf Area Index and Photosynthetic Temperature Response in Wheat (Triticum aestivum L.) Canopies." DigitalCommons@USU, 1990. https://digitalcommons.usu.edu/etd/6764.

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The objective of this study was to determine the effect of increasing leaf area index on the photosynthetic temperature response of a wheat canopy. Hard red spring wheat (Triticum aestivum L. cv. Veery-10) was grown hydroponically in a growth chamber, which also served as the gas-exchange chamber. Gas-exchange parameters were measured on single leaves and on wheat canopies at various leaf area indices. The temperature response curves of the canopy shifted from being steeper with a high temperature optimum to being flatter with a lower temperature optimum as leaf area index increased from 0 to

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31

Thomas, Dana Jeanette. "Morphological tradeoffs of American chesnut (Castanea dentata) and co-occurring hardwoods in varying nutrient and light regimes." Connect to this document online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1134161439.

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Thesis (M.S.)--Miami University, Dept. of Botany, 2005.<br>Title from first page of PDF document. Document formatted into pages; contains [1], v, 38 p. : ill. Includes bibliographical references (p. 35-38).

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32

McCurdy, Wyatt Conner. "Characterizing spatiotemporal variation in LAI of Virginia Pine Plantations." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/96595.

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Loblolly pine is an important managed tree species within the southeastern United States, and better understanding spatial patterns in its productivity has potential to contribute to both modeling and management of the species. Using recently-created pine management maps specific to Virginia and empirical relationships predicting pine LAI from the Landsat satellite, we conducted a statewide analysis of temporal patterns in stand-level southern pine leaf area index (LAI) following clear-cut and planting. Here, using 28 years of Landsat time-series data for 13,140 stands that were clear-cut betw

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33

Kenefic, Laura. "Leaf Area, Stemwood Volume Growth, and Stand Structure in a Mixed-Species, Multi-Aged Northern Conifer Forest." Fogler Library, University of Maine, 2000. http://www.library.umaine.edu/theses/pdf/KeneficLS2000.pdf.

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34

Joel, Gräsman. "Effekten av gödsling på björkars (Betula pendula) specifika bladarea (SLA) och tillväxt." Thesis, Linnéuniversitetet, Institutionen för skog och träteknik (SOT), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-90151.

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The number one highest growth-limiting factor in Swedish forests is nitrogen, because of that fertilization often gives a significant growth increase, wherever you are in Sweden. Specific leaf area (SLA) can be used as a standard measurement of how much resources a tre has to use to build up light absorbing leaf area of needles/leaves. Since there is a strong linear relationship between tree growth and leaf area, there should also be a clear correlation between each leaf area of single trees and its diameter, basal area and volume growth (Xiao, 2005).The datamaterial for the study was collecte

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35

Pacheco, Anna. "Contribution of hyperspectral remote sensing to the estimation of leaf area index in the context of precision agriculture." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26734.

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The estimation of Leaf Area Index (LAI) is a key parameter controlling biophysical processes of the vegetation canopy, and ultimately yield. Defined as one half the total green leaf area per unit ground surface area, LAI is an essential component of precision crop management. Direct field techniques are tedious, time-consuming and labour-intensive. Indirect techniques, such as determining gap fraction with optical instruments have proven to be a good alternative, but their use is limited to rigid field sampling techniques. Vegetation indices have been useful to estimate LAI but are limited mos

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36

Alavi, Ghasem. "Climate, leaf area, soil moisture and tree growth in spruce stands in SW Sweden : field experiments and modelling /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5710-6.pdf.

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37

Davidson, Diedre P., and University of Lethbridge Faculty of Arts and Science. "Sensitivity of ecosystem net primary productivity models to remotely sensed leaf area index in a montane forest environment." Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2002, 2002. http://hdl.handle.net/10133/155.

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Net primary productivity (NPP) is a key ecological parameter that is important in estimating carbon stocks in large forested areas. NPP is estimated using models of which leaf area index (LAI) is a key input. This research computes a variety of ground-based and remote sensing LAI estimation approaches and examines the impact of these estimates on modeled NPP. A relative comparison of ground-based LAI estimates from optical and allometric techniques showed that the integrated LAI-2000 and TRAC method was preferred. Spectral mixture analysis (SMA), accounting for subpixel influences on reflectan

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38

King, Nathan Todd. "The short-term effects of fertilization on loblolly pine (Pinus taeda L.) photosynthesis, dark respiration, and leaf area." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34476.

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The initial physiological processes leading to enhanced growth of loblolly pine subsequent to fertilization are not clearly understood. Much of the debate revolves around the temporal response of photosynthesis (Pn) to fertilization or even if Pn increases at all due to enhanced nutrition. This study tracked loblolly pine light-saturated photosynthesis (Asat), dark respiration (Rd), volume, height, basal diameter, and leaf area responses in eight clones to fertilization (112 kg/ha N) over the course of a growing season in the field. Measurements were conducted intensively before and after f

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39

Milla-Moreno, Estefania. "Structural properties related to mesophyll conductance and underlying variation in leaf mass area of balsam poplar (Populus balsamifera L.)." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/52158.

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In leaves, the ease with which CO₂ may diffuse from substomatal cavities to the sites of carboxylation (mesophyll conductance, gm) is inversely proportional to the pathway length in the gas phase and the structural resistances encountered in the liquid phase. Increased length of any pathway component should decrease gm, whereas increased area for diffusion should increase gm. There is evidence that within native balsam poplar (Populus balsamifera L.) populations, gm may increase with latitude of origin, as do leaf mass (LMA) and nitrogen per unit area. To investigate the internal structural ch

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40

Banskota, Asim. "The discrete wavelet transform as a precursor to leaf area index estimation and species classification using airborne hyperspectral data." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/39188.

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The need for an efficient dimensionality reduction technique has remained a critical challenge for effective analysis of hyperspectral data for vegetation applications. Discrete wavelet transform (DWT), through multiresolution analysis, offers oppurtunities both to reduce dimension and convey information at multiple spectral scales. In this study, we investigated the utility of the Haar DWT for AVIRIS hyperspectral data analysis in three different applications (1) classification of three pine species (Pinus spp.), (2) estimation of leaf area index (LAI) using an empirically-based model, and (3

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41

Jones, Brian Paul. "Determination and Manipulation of Leaf Area Index to Facilitate Site-Specific Management of Double-Crop Soybean in the Mid-Atlantic, U.S.A." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/31566.

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Double cropping soybean after small grain harvest does not always allow sufficient canopy growth to maximize photosynthesis and seed yield. This is due to a shorter growing season and moisture deficits common to the Mid-Atlantic USA. Leaf area index (LAI) is the ratio of unit leaf area of a crop to unit ground area and is a reliable indicator of leaf area development and crop biomass. An LAI of 3.5 to 4.0 by flowering is required to maximize yield potential. Soybean LAI will vary within and between fields due to soil differences, cultivar selection, and other cultural practices. Site-spec

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42

Hancock, Dennis Wayne. "SPECTRAL REFLECTANCE OF CANOPIES OF RAINFED AND SUBSURFACE IRRIGATED ALFALFA." UKnowledge, 2006. http://uknowledge.uky.edu/gradschool_diss/332.

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The site-specific management of alfalfa has not been well-evaluated, despite the economic importance of this crop. The objectives of this work were to i) characterize the effects of soil moisture deficits on alfalfa and alfalfa yield components and ii) evaluate the use of canopy reflectance patterns in measuring treatment-induced differences in alfalfa yield. A randomized complete block design with five replicates of subsurface drip irrigation (SDI) and rainfed treatments of alfalfa was established at the University of Kentucky Animal Research Center in 2003. Potassium, as KCl, was broadcast o

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Souza, Vanessa de Arruda. "Utilização de técnicas de sensoriamento remoto para a estimativa da evapotranspiração em uma cultura de arroz irrigado." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/72454.

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A evapotranspiração (ET) é um fenômeno natural que influencia diretamente mudanças no clima local e global, possuindo grande importância hidrológica e meteorológica. Este trabalho teve como objetivo estimar a ET através do método Penman-Monteith, e comparar com os resultados estimados pelo Método da Covariância de Vórtices Turbulentos. Os dados de IAF (Índice de Área Foliar) para descrição da vegetação foram obtidos a partir do sensor MODIS e de medições em campo da Rede SulFlux. A área de estudo desta pesquisa localizou-se no município de Cachoeira do Sul-RS, em uma propriedade de cultivo de

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44

Braun, Marko. "The Segmentation of Reflectances from Moderate Resolution Remote Sensing Data for the Retrieval of Land Cover Specific Leaf Area Index." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-75863.

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45

Pace, Micah D. "Effect of Stand Density on Behavior of Leaf Area Prediction Models for Eastern White Pine (Pinus strobus L.) in Maine." Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/PaceMD2003.pdf.

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Kandasamy, Sivasathivel. "Leaf Area Index (LAI) monitoring at global scale : improved definition, continuity and consistency of LAI estimates from kilometric satellite observations." Phd thesis, Université d'Avignon, 2013. http://tel.archives-ouvertes.fr/tel-00967319.

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Monitoring biophysical variables at a global scale over long time periods is vital to address the climatechange and food security challenges. Leaf Area Index (LAI) is a structure variable giving a measure of the canopysurface for radiation interception and canopy-atmosphere interactions. LAI is an important variable in manyecosystem models and it has been recognized as an Essential Climate Variable. This thesis aims to provide globaland continuous estimates of LAI from satellite observations in near-real time according to user requirements to beused for diagnostic and prognostic evaluations of

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Harrington, John T. "Physiological effects of moisture stress, moisture stress conditioning, and leaf area manipulations on black alder seedlings (Alnus glutinosa (L.) Gaertn.)." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45674.

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<p>This project consisted of three studies, two of which examined the effects of moisture deficits and moisture stress conditioning of black alder seedlings and the third examined the effects of shoot manipulations on the physiology of black alder seedlings and the nitrogenase activity of the seedlings' root nodules.</p> <p> Endophyte strain was found to be nonsignificant in response to moisture deficit and moisture-stress conditioning (MSC). Using regression analysis MSC significantly decreased the impact of low water potentials on photosynthesis and acetylene reduction. There were

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Johnson, Bryan Fisher. "Influence of Several Herbicides on Visual Injury, Leaf Area Index, and Yield of Glyphosate-Tolerant Soybean (Glycine max)." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/32295.

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The occasional failure of glyphosate to control all weeds throughout the entire growing season has prompted growers to sometimes use herbicides other than glyphosate on glyphosate-tolerant soybean. Field studies were conducted in 1999 and 2000 to investigate potential crop injury from several herbicides on glyphosate-tolerant soybean, and to determine the relationship between soybean maturity, planting date, and herbicide treatment on soybean injury, leaf area index (LAI), and yield. Three glyphosate-tolerant soybean cultivars representing maturity groups III, IV and V were planted at dates

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Bazzano, Lorenza. "Basal leaf removal to reduce fruitset and induce smaller and looser clusters in variety Trincadeira with compact bunches." Master's thesis, ISA-UL, 2016. http://hdl.handle.net/10400.5/13006.

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Mestrado Vinifera Euromaster - Viticulture and Enology - Instituto Superior de Agronomia - UL / Institutt National D'Etudes Superieures Agronomiques de Montpellier<br>This paper studies whether pre-flowering basal leaf removal is able to modify the cluster compactness in Vitis vinifera L. cv Trincadeira, as well as its berry composition and canopy density, in order to avoid the incidence of diseases such as Botrytis bunch rot. The first six leaves were removed for an early defoliation treatment (ED) performed at pre-bloom, and this was compared with a control non-defoliated (ND). During the ve

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Soma, Maxime. "Estimation de la distribution spatiale de surface et de biomasse foliaires de couverts forestiers méditerranéens à partir de nuages de points acquis par un LIDAR terrestre." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0111.

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Pour mieux comprendre le fonctionnement des écosystèmes forestiers à échelle fine, les modèles écophysiologiques cherchent à intégrer les flux d’énergie et de matière. Ces échanges dépendent de la distribution de la végétation. Leur modélisation nécessite donc une description de la structure de la végétation en trois dimensions (3D) à un niveau de détail que seule la télédétection peut produire à haut débit. Les LiDAR terrestre (Light Detection And Ranging) possèdent un fort potentiel pour caractériser en 3D la végétation au sein des canopées. De précédents travaux qui relient la densité de po

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