نتایج جستجو برای: forest ecosystems

تعداد نتایج: 144986  

2003
DAVID D. BRESHEARS JEFFREY J. WHICKER MATHEW P. JOHANSEN JOHN E. PINDER

Soil erosion is an important process in dryland ecosystems, yet measurements and comparisons of wind and water erosion within and among such ecosystems are lacking. Here we compare wind erosion and transport field measurements with water erosion and transport from rainfall-simulation for three different semi-arid ecosystems: a shrubland near Carlsbad, New Mexico; a grassland near Denver, Colora...

1999

This paper describes the impacts of unplanned urban expansion and land surface change in the city of Bamenda in Cameroon, the underlying causes and the ecological and social implications. This expansion has placed great stress on forest, land and water ecosystems. Much of the city’s rapid growth in population has been accommodated in informal settlements on steep slopes and flood plains, with l...

Journal: :Int. J. Digital Earth 2016
Dengsheng Lu Qi Chen Guangxing Wang Lijuan Liu Guiying Li Emilio Moran

A survey of remote sensing-based aboveground biomass estimation methods in forest ecosystems Dengsheng Lu, Qi Chen, Guangxing Wang, Lijuan Liu, Guiying Li & Emilio Moran a Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, School of Environmental & Resource Sciences, Zhejiang A&F University, Lin'An, China b Center for Global Change and Earth Obse...

Journal: :Journal of environmental biology 2010
Ibrahim Atalay Recep Efe

Turkey has very rich ecosystems and habitats in which various types of vegetation communities and fauna are found. These properties of Turkey depend on its geographical position, different climatic region, mountainous topographical conditions and climatic changes occurred during the Pleistocene. Several field works have been conducted during the period of 1975-2008. The field observations and a...

2000
DUNCAN MORRISON

Morrison D.J. 2000. Armillaria root disease: A major impediment to sustainable management of southern Interior ecosystems. In Proceedings, From science to management and back: a science forum for southern interior ecosystems of British Columbia. C. Hollstedt, K. Sutherland, and T. Innes (editors). Southern Interior Forest Extension and Research Partnership, Kamloops, B.C., pp. 23–26. Armillaria...

2013
Yi Zou Weiguo Sang Fan Bai Jan Christoph Axmacher

A positive relationship between plant diversity and both abundance and diversity of predatory arthropods is postulated by the Enemies Hypothesis, a central ecological top-down control hypothesis. It has been supported by experimental studies and investigations of agricultural and grassland ecosystems, while evidence from more complex mature forest ecosystems is limited. Our study was conducted ...

نادری, مصطفی, جعفرزاده, علی‌اکبر , حیدری, مهدی, کریمی‌کیا, حمدیه,

The key factor in understanding the forest ecosystems is forest structure. Spatial arrangement and location of trees are both one of the main components of forest stand structure. This study was carried out in Manesht protected area, Ilam province. In order to determine the ecological groups and spatial patterns of indicator species, we used fixed-area plots method. For data collection, 125 squ...

The land-use change, cutting forest trees and the grasslands conversion to agricultural lands destroyed natural ecosystems and also current or future production capacity reduce and these are harmful effects on the soil physicochemical characteristics. This study taken with aim, checking the role of forest-land change on some soil physical-chemical characteristics and then identify some effectiv...

2009
Sassan S. Saatchi

Today, the scientific community and the space organizations are becoming increasingly interested in the use of UHF radar sensors for global observation of forested ecosystems. This interest has challenged the radio science community to develop innovative and improved approaches to problems associated with the spaceborne UHF propagation and scattering of microwaves in forest applications. In thi...

2015
Diana Laarmann Henn Korjus Allan Sims Ahto Kangur Andres Kiviste John A. Stanturf

Post-mining restoration sites often develop novel ecosystems as soil conditions are completely new and ecosystem assemblage can be spontaneous even on afforested sites. This study presents results from long-term monitoring and evaluation of an afforested oil-shale quarry in Estonia. The study is based on chronosequence data of soil and vegetation and comparisons are made to similar forest site-...

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