近20年杭锦旗植被覆盖变化特征及驱动力分析  

Analysis on the Characteristics of Changes and Driving Forces of Vegetation Cover in Hangjin County in Recent 20 Years

作　　者：何亮 梁海荣[2] 李钢铁 刘雪锋[2] 齐容镰 杨文斌[3] HE Liang;LIANG Hai-rong;LI Gang-tie;LIU Xue-feng;QI Rong-lian;YANG Wen-bin(College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010010,China;Inner Mongolia Academy of Forestry Science,Hohhot 010010,China;Institute of Desertification Studies,Chinese Academy of Forestry,Beijing 100091,China)

机构地区：[1]内蒙古农业大学沙漠治理学院,内蒙古呼和浩特010010 [2]内蒙古自治区林业科学研究院,内蒙古呼和浩特010010 [3]中国林业科学研究院荒漠化研究所,北京100091

出　　处：《生态与农村环境学报》2021年第5期587-596,共10页Journal of Ecology and Rural Environment

基　　金：内蒙古自治区科技重大专项“沙化土地抗逆树种筛选与适地适树研究”。

摘　　要：以MOD13Q1为数据源,采用固定起始年份,逐步增加结束年份的分析方法并辅以Sen+Mann-Kendall趋势、Hurst指数等方法,探究杭锦旗2000—2017年植被覆盖变化特征及驱动力。结果表明:(1)杭锦旗植被覆盖由北向南空间分布格局呈“高低高”特征。随着研究时段的延长,归一化植被指数(NDVI)显著改善面积呈先增加后减少趋势,退化面积则表现为先减少后增加;(2)不同土地利用类型NDVI均值由大到小依次为耕地、有林地、灌丛、草地和沙地,18 a间有林地、灌丛和草地NDVI增速显著,沙地最低;(3)研究区未来NDVI主要变化趋势表现为退化,占比为57.93%,需进一步精准施策,加强该地区生态保护力度;(4)降水对NDVI的作用以正效应为主,而温度以负效应为主且相关性随时段延长而降低,人类活动对NDVI影响则具有双重效应;(5)各阶段驱动力逐渐复杂化,气象要素和人类活动共同作用对NDVI影响更为显著。Using MOD13Q1 as the data source,by adopting the analysis method of fixed starting year and increased ending years,and supplemented by Sen+Mann-Kendall slope method and Hurst index methods,the characteristics and driving forces of the changes of vegetation cover in Hangjin County from 2000-2017 was investigated.The results show that:(1)the spatial distribution pattern of vegetation cover in Hangjin County showed“high-low-high”trend from north to south;a greening-browing trend was observed in the significantly increased area of normalized difference vegetation index(NDVI),while the degraded area had a first downward and then upward trend;(2)the mean NDVI value presented an order:agricultural land>forest>shrub>grassland>sandland under the different land use types,and the increase rate of NDVI in forest,shrub and grassland was significant while sandy land was the lowest;(3)the main trend of NDVI in the study area is degradation,accounting for 57.93%of the total area of the Hangjin County,and precise measures should be taken to strengthen ecological protection in this region;(4)precipitation had a positive effect on NDVI,whereas temperature did not promote vegetation grown and the correlation decreased with time period lengthening;and human activities had a dual effect on NDVI;(5)the driving forces of each period exhibited a complicated status gradually,and the interactions of climate variations and human activities had significant effects on NDVI.

关 键 词：杭锦旗 MODIS-NDVI 植被覆盖 变化趋势 驱动力 

分 类 号：X171[环境科学与工程—环境科学]