نتایج جستجو برای: tree composition

تعداد نتایج: 424792  

2005
Raymond L. Czaplewski Michael Hoppus Andrew Lister

Detailed data on tree species drive models that predict risk of insect and disease mortality in forest stands and simulation models for future stand conditions. Application of such models in geospatial analyses requires these data for millions of remotely sensed pixels. However, the vast majority of remotely sensed thematic maps predict a few categories of stand conditions, such as forest type ...

2017
Yu-Jie Zhou Jian-Hua Li Cynthia Ross Friedman Hua-Feng Wang

Regarding rubber tree plantations, researchers lack a basic understanding of soil microbial communities; specifically, little is known about whether or not soil microbial variation is correlated with succession in these plantations. In this paper, we used high-throughput sequencing of the 16S rRNA gene to investigate the diversity and composition of the soil bacterial communities in a chronoseq...

Journal: :Int. J. Found. Comput. Sci. 2015
Andreas Maletti

The expressive power of regularity-preserving ε-free weighted linear multi bottom-up tree transducers is investigated. These models have very attractive theoretical and algorithmic properties, but their expressive power is not well understood especially in the weighted setting. It is proved that despite the restriction to preserve regularity their power still exceeds that of composition chains ...

2016
SUGENG BUDIHARTA

Budiharta S (2010) Floristic composition at biodiversity protection area in Lubuk Kakap, District of Ketapang, West Kalimantan. Biodiversitas 11: 151-156. A study on floristic composition has been conducted at biodiversity protection area (Kawasan Perlindungan Plasma Nutfah, KPPN) of PT. Suka Jaya Makmur in Lubuk Kakap, District of Ketapang, West Kalimantan. Two sampling methods were used: Poin...

2017
Rim Khlifa Alain Paquette Christian Messier Peter B Reich Alison D Munson

Studies of biodiversity-ecosystem function in treed ecosystems have generally focused on aboveground functions. This study investigates intertrophic links between tree diversity and soil microbial community function and composition. We examined how microbial communities in surface mineral soil responded to experimental gradients of tree species richness (SR), functional diversity (FD), communit...

2018
Sivajanani Sivarajah Sandy M Smith Sean C Thomas

Human exposure to green space and vegetation is widely recognized to result in physical and mental health benefits; however, to date, the specific effects of tree cover, diversity, and species composition on student academic performance have not been investigated. We compiled standardized performance scores in Grades 3 and 6 for the collective student body in 387 schools across the Toronto Dist...

2016
Heiko Nacke Kezia Goldmann Ingo Schöning Birgit Pfeiffer Kristin Kaiser Genis A. Castillo-Villamizar Marion Schrumpf François Buscot Rolf Daniel Tesfaye Wubet

The complex interactions between trees and soil microbes in forests as well as their inherent seasonal and spatial variations are poorly understood. In this study, we analyzed the effects of major European tree species (Fagus sylvatica L. and Picea abies (L.) Karst) on soil bacterial and fungal communities. Mineral soil samples were collected from different depths (0-10, 10-20 cm) and at differ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2006
William F Laurance Henrique E M Nascimento Susan G Laurance Ana Andrade José E L S Ribeiro Juan Pablo Giraldo Thomas E Lovejoy Richard Condit Jerome Chave Kyle E Harms Sammya D'Angelo

Forest fragmentation is considered a greater threat to vertebrates than to tree communities because individual trees are typically long-lived and require only small areas for survival. Here we show that forest fragmentation provokes surprisingly rapid and profound alterations in Amazonian tree-community composition. Results were derived from a 22-year study of exceptionally diverse tree communi...

Tree marking can cause changes in forest. This study aimed to assess tree marking operation and to predict its effect on stand structure of Persian ironwood-hornbeam stands at Bahramnia forestry plan, north of Iran. Therefore 98 trees that were marked in compartment 9 of the mentioned forest in 2017 based on selection system and according to the recent laws of Forests, Range and Watershed Manag...

2014
Jean-Marc Hero Sarah A. Butler Gregory W. Lollback James G. Castley

A variety of environmental processes, including topography, edaphic and disturbance factors can influence vegetation composition. The relative influence of these patterns has been known to vary with scale, however, few studies have focused on environmental drivers of composition at the mesoscale. This study examined the relative importance of topography, catchment flow and soil in influencing t...

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