Integration of remote sensing and GIS technology to evaluate grassland ecosystem health in north China

文献类型： 外文期刊

第一作者： Qin, ZH

作者： Qin, ZH;Xu, B;Xin, XP;Zhou, QB;Zhang, HO;Li, J

作者机构：

关键词： grassland;ecosystem;overgrazing;unsuitable farming;desertification

期刊名称：IGARSS 2004: IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM PROCEEDINGS, VOLS 1-7: SCIENCE FOR SOCIETY: EXPLORING AND MANAGING A CHANGING PLANET

ISSN：

年卷期： 2004 年

页码：

收录情况： SCI

摘要： Grassland in north China faces serious ecological degradation in recent decades. Overgrazing and unsuitable farming over the grassland are believed to he the direct causes leading to such ecological disasters as sand and dust storms ill north China. Objective of the study is to integrate remote sensing awl GIS technology for evaluation of grassland environmental healh in north China. Methodology used ill the study includes ground observation grassland database establishment, reclamation mopping and remote sensing image interpretion. Our results indicate that grassland reclamation for agricultural farming is very serious ill recent decade in north China. About 15% of grassland has been reclaimed into farmland in the transaction zone of north China ill a short period from 1985 to 2000. Most reclaimed farmlands are not suitable for agricultural cropping. In both transaction and posture zones the areas of unsuitable farmland account for above 20% of total farmland area. Desertification is also very serious in the grassland. 4 of the 6 provinces under study, have over hoof of grassland areas suffering Various levels of desertification. Percentage of grassland areas under intensive desertification to the total is high up to 57% in Gansu and over 30% in Inner Mongolia, Qinghai and Ningxia. We classified the grassland into 5 categories according to the degree of desertification. The results show that the categories with slight, moderate and complete desertification mainly concentrate ill southern and central Inner Mongolia. This evaluation provides valuable assistances to policy proposals for local administration of farming and grazing activities in the region.

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