Valuation of rangeland ecosystem degradation with remote sensing technology in China

文献类型： 外文期刊

第一作者： Wang, Ruijie

作者： Wang, Ruijie;Qin, Zhihao;Jiang, Lipeng;Ye, Ke;Qin, Zhihao

作者机构：

关键词： rangeland ecosystem;ecosystem degradation valuation;remote sensing;China

期刊名称：REMOTE SENSING FOR ENVIRONMENTAL MONITORING, GIS APPLICATIONS AND GEOLOGY VI

ISSN： 0277-786X

年卷期： 2006 年 6366 卷

页码：

收录情况： SCI

摘要： Rangeland ecosystems play important roles in both economic development and ecological service in China. The ecosystems are facing challenges of degradation in recent decades due to heavy population pressure and overgrazing. Valuation of the ecosystem degradation is thus urgently required for better administration of the rangeland ecosystem for sustainable development. An approach was developed to use remote sensing technology for valuation of rangeland ecosystem degradation in the paper. A model has been improved from the conventional method for the valuation. Parameterization of the model is retrieved from MODIS data hence featured with spatiality, which is required for the valuation. The model is then applied to MODIS data for the period between 2003 and 2005. Results indicate that the total degradation in Chinese rangeland ecosystem can be valued as 6660.3 million US dollars. The degradation can be evaluated into several categories according to the amount per square kilometer. Slight degradation with a value of 0 similar to 1000 US$ . km(-2) accounts for similar to 1/4 of the total rangeland area in China. Severe degradation with a value of 1000 similar to 3000 US$ . km-2 accounts for similar to 1/3 of the total rangeland area. This indicates that the degradation is very common in the ecosystems. In spatial distribution, Inner Mongolia, Xinjiang, Tibet, Qinghai, Gansu, Yunnan and Sichuan are the main provinces with rangeland ecosystems, hence become the main contributors to the degradation. Inner Mongolia has the greatest degradation value among the provinces. Its degradation value accounts for 25.89% of the entire China. The seven provinces in the west have a degradation value of 5221.9 million US dollars, accounting for 78.41%.

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