نتایج جستجو برای: vegetation degradation

تعداد نتایج: 196873  

2013
Qi Chen

Accurate estimates of vegetation biomass are critical for calibrating and validating biogeochemical models (Hurtt et al. 2010), quantifying carbon fluxes from land use and land cover change (Shukla et al. 1990; Houghton et al. 2001), and supporting the United Nations Framework Convention on Climate Change (UNFCCC) program to reduce deforestation and forest degradation (Reducing Emissions from D...

2004
Meixue Yang Shaoling Wang Tandong Yao Xiaohua Gou Anxin Lu Xuejun Guo

Desertification in Qinghai-Xizang (Tibet) Plateau is part of Chinese desertification. In the past decades, due to the climate warming, the climate condition in Qinghai-Xizang (Tibet) Plateau has been relatively dry. This has resulted in permafrost degradation and other environmental problems. In addition, the vegetation and the soil layer were also destroyed by unreasonable economic activities....

2011
N. Juergens

Contents 1. Introduction 1.1. Arid Ecosystems 1.2. Desertification 2. Degradation of natural resources 3. Frame conditions: The importance of scale 4. Defining compartments for feasible approaches 5. Assessment and monitoring of the problem 6. Approaches to combating degradation in arid systems 6.1. Practical steps within the biophysical system 6.1.1 Water resources 6.1.2. Conservation of soils...

Journal: :Infection and immunity 1978
R A Calderone M F Rotondo M A Sande

Candida albicans endocarditis was established in rabbits after transaortic catherization. Within 30 to 90 min after infection, C. albicans was observed by scanning electron microscopy on the valve surface. The organisms were predominantly associated with host deposits of erythrocytes, phagocytes, platelets, and fibrinous-appearing material, which collectively appeared on the valve surface in re...

2008
Vishal K. Mehta Patrick J. Sullivan M. Todd Walter Jagdish Krishnaswamy Stephen D. DeGloria

Indian forests provide a multitude of services to vast populations. Common human activities including livestock grazing, fuelwood extraction and burning have the potential to impact forest ecosystem structure and function. The effects of these activities on vegetation, ecology and soil properties were investigated in Bandipur National Park (BNP) in southern India. Data were collected from 200 s...

2010
Yeong Dae Park Don Koo Lee Jamsran Tsogtbaatar John A. Stanturf

Forests in Mongolia have been severely degraded by forest fi re and exploitive logging. This study investigated changes in vegetation and soil properties after forest fi re or clearfelling. Microclimate conditions such as temperature and relative humidity (RH) changed drastically after forest fi re or logging; temperature increased 1.6-1.7 oC on average, whereas RH decreased up to 15.7 percent ...

افضلی, نظر, باشتنی, مسلم, شریفی, محمد, غفوری, ام البنین, فرزادمهر, جلیل,

This experiment was done to determine the effectd of growth stage on chemical composition and processing by NaOH and CaOH2 on ruminally degradability of Haloxylon sp. pasture plant in seeding stage. The enough amount of Haloxylon in 3 vegetation stages was prepared from Amari SarChah in May and October and December of 2010. The chemical composition of Haloxylon sp. was determined in three stage...

Journal: :Remote Sensing 2017
Zhoutao Zheng Wenquan Zhu

Vegetation phenology is considered a sensitive indicator of climate change, which controls carbon, nitrogen, and water cycles within terrestrial ecosystems. The Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) is an important moderate resolution remote sensing data for monitoring vegetation phenology. However, Terra MODIS Collection 5 (C5) vege...

Dust events of Iran mainly originate from Iraq, Syria, Saudi Arabia, Kuwait and inland territories which are influenced by droughts and Land Use/Land Cover (LU/LC) degradation in regional scale. The aim of this research was to investigate the impact of Regional Vegetation Cover Degradation (RVCD), particularly Regional Rangeland Cover Degradation (RRCD) on frequency of dusty days in western pro...

ژورنال: مرتع 2022

Background and objectives: Alongside with the progresss in satellite sensors, their role on obtaining information and study of the environmental events and phenomena have become increasingly important. One of these precious data which is the basis for many planning and decision making in rangelands, is the above ground net primary production assements. The traditional method of estimating ANPP ...

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