The Tendency and its Spatial Pattern of Grassland Changes in the East Xilin Gol from 1975 to 2009: The Tendency and its Spatial Pattern of Grassland Changes in the East Xilin Gol from 1975 to 2009
The Tendency and its Spatial Pattern of Grassland Changes in the East Xilin Gol from 1975 to 2009: The Tendency and its Spatial Pattern of Grassland Changes in the East Xilin Gol from 1975 to 2009
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DOI：
10.3724/sp.j.1047.2011.00549
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发表时间：
2011-08
期刊：
影响因子：
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通讯作者：
Yan Yan-Yan;Ala tengtuya;Yunfeng Hu;Yue Liu;Guomao Yu
中科院分区：
文献类型：
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作者：
Yan Yan-Yan;Ala tengtuya;Yunfeng Hu;Yue Liu;Guomao Yu
利用20世纪70年代中后期的MSS影像、1990、2000、2005年的TM影像和2009年的HJ-1影像，首次建立了东乌珠穆沁旗、西乌珠穆沁旗和锡林浩特市5个时期的草地现状资料，在此基础上，结合区域地理学原理，建立了锡林郭勒盟东部草地变化分类体系，并在GIS支持下，对锡林郭勒盟东部草地变化的时空分布格局进行了深入分析，主要结果如下：1975 - 2009年，锡林郭勒盟东部草地存在长期退化过程，2000年是一个转折点：2000年以前，锡林郭勒盟东部草地变化处于加速退化过程，退化面积比例不断上升，1975-2000年，2000年以后，虽然退化草地面积大于改良草地面积，但两者之间的差距缩小，总体变化面积减小;速度和空间范围明显缩小，抑制了前期加速退化过程，从空间分布来看，草地破碎化和覆盖度减少是主要的退化类型，2000年前从锡林浩特向东乌珠穆沁和西乌珠穆沁扩展，2000年后从东乌珠穆沁和西乌珠穆沁向锡林浩特收缩。
Using remote sensing images including MSS images in the middle and late 1970s,TM images in 1990,2000,2005 and HJ-1 images in 2009,the grassland changes database in eastern Xilin Gol League(East Ujimqin Banner,West Ujimqin Banner and Xilinhot City) including grassland current situation data for five periods was firstly developed,and then a grassland change classification system was established based on these images and regional geographic principle.Then,supported by GIS,the temporal and spatial distribution pattern of grassland changes in eastern Xilin Gol was analyzed deeply.The main results include: the grassland in eastern Xilin Gol existed a long-term degradation process during the period from 1975 to 2009.The year of 2000 is a breaking point: before the year of 2000,grassland change in eastern Xilin Gol was in an accelerated degradation process,and the percentage of degradation area climbed.During 1975-2000,the strength and range of the grassland degradation reached the most serious and intensive peak;after the year of 2000,although the degraded ared was larger than those improved,the deference between them was narrowed and the whole changed area was reduced;the speed and space range was reduced obviously,and the previous accelerated degradation process was contained.Judging from the spatial distribution,as the main degradation type,grassland fragmentation and coverage reduction expanded from Xilinhot to East Ujimqin and West Ujimqin before 2000,and then shrinked to Xilinhot from East Ujimqin and West Ujimqin after 2000.The other type of grassland change,i.e.improved grasses,showed a similar spatial distribution pattern with those of grassland fragmentation and coverage reduction.