基于空间异质性的库鲁斯台草地退化  

Grassland degradation assessment based on spatial heterogeneity in Kulusitai

作　　者：高梓茜 包安明[1,3] 郑国雄 黄晓然[1,2] 于涛 刘铁 GAO Ziqian;BAO Anming;ZHENG Guoxiong;HUANG Xiaoran;YU Tao;LIU Tie(State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;University of Chinese Academy of Sciences,Beijing 100049,China;China-Pakistan Joint Research Center on Earth Sciences,CAS-HEC,Islamabad 45320,Pakistan)

机构地区：[1]中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室,乌鲁木齐830011 [2]中国科学院大学,北京100049 [3]中国科学院-巴基斯坦高等教育委员会中国-巴基斯坦地球科学研究中心,伊斯兰堡45320

出　　处：《中国科学院大学学报（中英文）》2023年第6期735-742,共8页Journal of University of Chinese Academy of Sciences

基　　金：王宽诚教育基金会(GJTD-2020-14)资助。

摘　　要：以库鲁斯台草原为研究区,基于1990—2020年Landsat数据,选择归一化植被指数(NDVI)及空间异质性作为草地退化的遥感监测指标,对库鲁斯台草地退化状况进行评估。结果表明:1)1990—2020年,研究区中部NDVI呈上升趋势,而边缘区域呈下降趋势;草地空间异质性上升的区域主要集中在研究区中部及西南部地区,北部和南部则以下降为主。2)草地退化的监测表明,约54%的草地出现退化,35%的草地得到了改善,10%的草地植被恢复。3)温度和降水对草地空间异质性的年际变化影响较小,对NDVI影响较大,降水量是影响库鲁斯台草原NDVI时间动态的主要因素。Based on Landsat data from 1990 to 2020,this study used the normalized difference vegetation index(NDVI)and spatial heterogeneity as indicators to monitor the grassland degradation in Kulusitai.The results showed that:1)During the study period,the NDVI in the central part of the study area exhibited an increasing trend,while the marginal area showed a decreasing trend.The spatial heterogeneity of grassland increased in the central and southwestern areas and decreased in the northern and southern areas.2)About 54%of the grassland in the Kulusitai was degraded at different levels,35%of grassland was improved and 10%of grassland showed regrowing conditions.3)Temperature and precipitation had little influence on interannual variation of spatial heterogeneity.However,they showed significant impacts on NDVI yearly dynamics,in which precipitation was the dominant climate factor.

关 键 词：草地退化 遥感 NDVI 空间异质性 库鲁斯台草原 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]