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基于MODIS-NDVI的三江源区称多县高寒草地退化现状评价

作  者:
杨文才;吴新宏;张德罡;石红霄;李鹏;丁勇
单  位:
甘肃农业大学草业学院/草业生态系统教育部重点实验室/甘肃省草业工程实验室/中-美草地畜牧业可持续发展研究中心;中国农业科学院
关键词:
称多县;高寒草甸;MODIS-NDVI;草地退化;空间分布
摘  要:
通过对三江源区高寒草地现状调查,依据地上生物量和植被盖度将高寒草地退化分为未退化、轻度、中度、重度、极度退化5个等级。结合调查期间的MODIS影像,分别建立基于NDVI的地上生物量和植被盖度模型,按照退化等级标准分类,制作了相应的退化等级图,并统计各退化等级的面积和比例。结果表明:研究区域未退化草地所占草地面积比例为33.23%,轻度退化草地所占草地面积比例为25.55%,中度退化草地所占草地面积比例为15.72%,重度退化草地所占草地面积比例为12.48%;极度退化草地所占草地面积比例为13.02%。
译  名:
Evaluation of alpine grassland degradation of Three-River Source area in Chengduo Country based on MODIS-NDVI
作  者:
YANG Wen-cai1,WU Xin-hong2,ZHANG De-gang1,SHI Hong-xiao2, LI Peng2,DING Yong2(1.College of Pratacultural Science,Gansu Agricultural University/Key Laboratory of Grassland Ecosystem,Ministry of Education/Pratacultural Engineering Laboratory of Gansu Province/Sino-U.S. Centers for Grazingland Ecosystem Sustainability Lanzhou 730070,China;2.Grassland Research Institute of The Chinese Academy of agricultural Science,Hohhot,010010 China)
关键词:
Chengduo County;grassland degradation;MODIS-NDVI;spatial distribution
摘  要:
Alpine grassland situation of Three-River source area was surveyed on ground biomass and vegetation coverage.And the alpine grassland was divied into five ranks(non-degeneration,mild,moderate,severe and extreme degeneration).We established a model of ground biomass and vegetation coverage based on NDVI.According to degeneration rank,we had drawn a corresponding degeneration rank chart and calculated the area and proportion of each degenerated rank.The result indicates that the proportion of the non-degeneration,mild,moderate,severe,extreme degeneration was 33.23%,25.55%,15.72%,12.48% and 13.02% respectively.

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