نتایج جستجو برای: forest structure

تعداد نتایج: 1663160  

2015
Yi Jin Hong Qian Mingjian Yu Mingxi Jiang

Investigating patterns of phylogenetic structure across different life stages of tree species in forests is crucial to understanding forest community assembly, and investigating forest gap influence on the phylogenetic structure of forest regeneration is necessary for understanding forest community assembly. Here, we examine the phylogenetic structure of tree species across life stages from see...

ژورنال: علوم آب و خاک 2012
جهانگرد محمدی, , سید محسن حسینی, , سید محمد حجتی, , یحیی کوچ, ,

To investigate spatial variability of soil characteristics in the most valuble forest stands in the northern Iran using geostatistical approach, a twenty hectare area in Experimental Forest Station of Tarbiat Modares University was considered. Soil samples were taken from pits, mounds, canopy gaps, under single trees and closed canopy positions at 0 - 15, 15 - 30 and 30 - 45 cm depths using cor...

1999
Michael A. Lefsky Warren B. Cohen Andrew Hudak Steven A. Acker Janet L. Ohmann

Recent work has established the utility of waveform sampling lidar for predicting forest structural attributes. Nevertheless, serious obstacles to its wide-spread use still exist. They include the lack of waveform sampling lidar sensors capable of measuring forest canopy structure over large extents, and the practical difficulty of developing widely applicable relationships to predict forest st...

2010
F. Kugler S-K. Lee S. Sauer A. Toraño K. Papathanassiou

A central parameter of the terrestrial carbon budget is forest biomass which represents a proxy for the stored carbon. Despite its crucial role in the terrestrial carbon budget, forest biomass is poorly quantified across most parts of the planet due to the great difficulties in measuring biomass on the ground and consistently aggregating measurements across scales. Today’s information is largel...

2010
Chadwick D. Rittenhouse Anna M. Pidgeon Thomas P. Albright Patrick D. Culbert Murray K. Clayton Curtis H. Flather Chengquan Huang Jeffrey G. Masek Susan I. Stewart Volker C. Radeloff

BACKGROUND Quantifying changes in forest bird diversity is an essential task for developing effective conservation actions. When subtle changes in diversity accumulate over time, annual comparisons may offer an incomplete perspective of changes in diversity. In this case, progressive change, the comparison of changes in diversity from a baseline condition, may offer greater insight because chan...

Journal: :Ecology letters 2018
Insu Jo Kevin M Potter Grant M Domke Songlin Fei

Forest mycorrhizal type mediates nutrient dynamics, which in turn can influence forest community structure and processes. Using forest inventory data, we explored how dominant forest tree mycorrhizal type affects understory plant invasions with consideration of forest structure and soil properties. We found that arbuscular mycorrhizal (AM) dominant forests, which are characterised by thin fores...

2010
Astor TORAÑO CAICOYA Florian KUGLER Irena HAJNSEK Kostas PAPATHANASSIOU

Forest biomass stock and spatial distribution are still unknown parameters for many regions of the world. Today’s information is largely based on ground measurements on a plot basis without remote regions coverage. Thus, a method capable of quantifying biomass by means of Remote Sensing could help to reduce these uncertainties and contribute to a better understanding of the carbon cycle (Hought...

Journal: :Ecological applications : a publication of the Ecological Society of America 2011
Alexander S Antonarakis Sassan S Saatchi Robin L Chazdon Paul R Moorcroft

Insights into vegetation and aboveground biomass dynamics within terrestrial ecosystems have come almost exclusively from ground-based forest inventories that are limited in their spatial extent. Lidar and synthetic-aperture Radar are promising remote-sensing-based techniques for obtaining comprehensive measurements of forest structure at regional to global scales. In this study we investigate ...

2009
Deborah Baranga Colin A. Chapman John M. Kasenene

Given the extent of tropical forest deforestation and as a number of conservation programmes and local communities rely on forest fragments, it has become important to understand how fragment exploitation by local communities affects forest structure and function. The effects of forest exploitation on forest structure and status of forest fragments were investigated in 20 nonreserved forest fra...

Journal: :محیط زیست طبیعی 0
حسین وارسته مرادی استادیار دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران

although host species generally face increased risk of brood parasitism in fragmented temperate landscapes and forest edge, little information exists to assess such risks in tropical birds. we studied how cuculidae species populations, host species population, and micro-environmental variables changed along an edge-to-interior gradient in peninsular malaysia. bird observations and environmental...

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