نتایج جستجو برای: grassland

تعداد نتایج: 10371  

2015
Xiaobin Dong Guangshuo Dai Sergio Ulgiati Risu Na Xinshi Zhang Muyi Kang Xuechao Wang Jian Yang

Inner Mongolia is among the most important regions in terms of contribution to the socio-economic development of China. Furthermore, its grassland is a major ecological barrier for Northern China. The present study evaluates the changes in ecosystem services availability and human wellbeing based on a survey on864 herdsmen of the grassland and 20 governmental officials. The survey provided the ...

Journal: :Ambio 2006
Gaoming Jiang Xingguo Han Jianguo Wu

Land degradation is one of the major environmental problems worldwide and has become particularly severe in recent decades in China, with its rapid economic developments. China has an enormous area of grasslands, covering 41% of its territory (3.93 million km), and grasslands are regarded as among the most important natural resources because of their ecological and economic importance. However,...

2013
Lihua Zhou Yanling Zhu Guojing Yang Yiqi Luo

In northern China, the recent eco-environment protective policies played a very important role in the ecological environment protection and rehabilitation. To better understand the quantitative effect of the prohibiting grazing policy on grassland desertification reversal process, in this paper, Yanchi County was selected as a case study to conduct a quantitative research on the effect of prohi...

Journal: :Journal of environmental biology 2011
S Gnaana Saraswathi Kailash Paliwal

Seasonal changes in soil respiration (SR), soil temperature (ST) and soil moisture (SM) were compared between a barren land with no vegetation (control) and grassland dominated by Heteropogon contortus (L.) of a semi-arid eco-system during 2005-2006. A statistically significant (p<0.001) seasonal change in SR was observed between the two sites. The variation characteristics of soil CO2 effiux r...

Journal: :Journal of environmental management 2002
N G Burnside R F Smith S Waite

The South Downs Area of Outstanding Natural Beauty, UK, is an internationally and nationally important landscape, which contains a significant proportion (28%) of the southeast of England's calcareous grassland resource. The traditional calcareous grassland habitats characteristic of the downland landscape have suffered significant losses since the Second World War, and the remaining sites are ...

2009
Kurt Riitters James Wickham Timothy Wade

T effects of landscape context on habitat quality are receiving increased attention in conservation biology. The objective of this research is to demonstrate a landscape-level approach to mapping and evaluating the anthropogenic risks of grassland and forest habitat degradation by examining habitat context as defined by intensive anthropogenic land uses at multiple spatial scales. A landscape m...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2013
Christopher K Wright Michael C Wimberly

In the US Corn Belt, a recent doubling in commodity prices has created incentives for landowners to convert grassland to corn and soybean cropping. Here, we use land cover data from the National Agricultural Statistics Service Cropland Data Layer to assess grassland conversion from 2006 to 2011 in the Western Corn Belt (WCB): five states including North Dakota, South Dakota, Nebraska, Minnesota...

Journal: :Remote Sensing 2014
Yunxiang Jin Xiuchun Yang Jianjun Qiu Jinya Li Tian Gao Qiong Wu Fen Zhao Hailong Ma Haida Yu Bin Xu

Grassland biomass is essential for maintaining grassland ecosystems. Moreover, biomass is an important characteristic of grassland. In this study, we combined field sampling with remote sensing data and calculated five vegetation indices (VIs). Using this combined information, we quantified a remote sensing estimation model and estimated biomass in a temperate grassland of northern China. We al...

2017
Ed-Haun Chang Guanglong Tian Chih-Yu Chiu

Wildfire often causes tremendous changes in ecosystems, particularly in subalpine and alpine areas, which are vulnerable due to severe climate conditions such as cold temperature and strong wind. This study aimed to clarify the effect of tree re-planting on ecosystem services such as the soil microbial community after several decades. We compared the re-planted forest and grassland with the mat...

2012
Li Jiang Rui Guo Tingcheng Zhu Xuedun Niu Jixun Guo Wei Sun

BACKGROUND Understanding how grasslands are affected by a long-term increase in temperature is crucial to predict the future impact of global climate change on terrestrial ecosystems. Additionally, it is not clear how the effects of global warming on grassland productivity are going to be altered by increased N deposition and N addition. METHODOLOGY/PRINCIPAL FINDINGS In-situ canopy CO(2) exc...

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