基于Geodetector的广西喀斯特植被覆盖变化及其影响因素分析  

Vegetation cover change and its influencing factors in karst regions of Guangxi based on Geodetector

作　　者：刘大元 张雪梅 岳跃民[2,3] 王克林[2,3] 邹冬生[1] LIU Da-yuan;ZHANG Xue-mei;YUE Yue-min;WANG Ke-lin;ZOU Dong-sheng(College of Bioscience and Biotechnology,Hunan Agricultural University,Changsha,Hunan 410125,China;Key Laboratory of Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,the Chinese Academy of Sciences,Changsha,Hunan 410125,China;Huanjiang Observation and Research Station for Karst Eco-systems,Huanjiang,Guangxi 547100,China)

机构地区：[1]湖南农业大学生物科学技术学院,湖南长沙410125 [2]中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室,湖南长沙410125 [3]中国科学院环江喀斯特生态系统观测研究站,广西环江547100

出　　处：《农业现代化研究》2019年第6期1038-1047,共10页Research of Agricultural Modernization

基　　金：国家重点研发计划项目(2016YFC0502400)~~

摘　　要：广西喀斯特地区生态环境脆弱,植被退化严重,石漠化问题突出。随着一系列生态保护与建设措施的实施,广西植被已逐渐恢复,石漠化面积扩张趋势已得到控制。深入了解广西植被覆盖演变特征及其主导因素可为新一轮石漠化治理工程实施提供科学依据。本研究基于1982-2015年GIMMS NDVI3g生长季NDVI(the growing season GSN)数据和1982-2016年AVHRR VCF数据,分析广西植被时空变化特征,同时结合气候、土壤以及人类活动等因素,运用地理探测器模型,探究自然和人文因素对区域尺度植被覆盖变化影响的空间差异。结果表明,1982-2015年广西植被,尤其是林地面积比例呈增加趋势,裸地面积比例呈减少趋势;广西北部、西北部的植被覆盖显著高于广西中部和东南部经济活动较强的区域;影响植被变化的综合因素主要包括交通通达度、气候条件、社会经济条件和土壤养分等,其中,社会经济条件对植被和裸地空间分异的解释率分别为20.49%和21.27%,其次为交通通达度、气候条件和土壤养分;植被与裸地在空间上呈显著负相关(R=-0.65,P<0.01),社会经济发展水平是影响植被和裸地空间分布的主导因素。Karst areas in Guangxi are typically eco-fragile zones, with serious degraded vegetation and rocky desertification. The vegetation in karst areas of Guangxi has been gradually recovering and the expansion trend of rocky desertification has been improving with a series of ecological conservation and restoration programmes. It is critical to explore the evolution characteristics and driving factors of vegetation recovery changes in Guangxi for the further implementation of rocky desertification treatment project. This study aimed to identify the spatial and temporal changes of vegetation in Guangxi based on the growing season NDVI(GSN)GIMMS NDVI3g data from 1982 to 2015 and the AVHRR vegetation continuous fields(VCF)products from 1982 to 2016. The geographical detector model was used to explore the spatial stratification of the impacts of natural and human factors on vegetation changes at the regional scale.The results showed that both the vegetation from 1982 to 2015 and the tree canopy(TC)cover from 1982 to 2016 inGuangxi are significantly increasing. While the proportion of the bare ground(BG)cover from 1982 to 2016 was decreased. The vegetation cover in north and northwest Guangxi was significantly higher than that in central and southeastern Guangxi. The main vegetation changing drivers were traffic accessibility, climate change, socio-economic conditions and soil nutrients. Among them, the impacts of socio-economic conditions on vegetation activities and BG were the largest, with an explanatory rate of 20.49% and 21.27%, respectively. Then it was traffic accessibility, climate condition and soil nutrients. There was a significant negative correlation between vegetation and bare ground land(R=-0.65, P<0.01). Socio-economic conditions were the dominant factors impacting the spatial distribution of vegetation and bare ground land.

关 键 词：喀斯特生态系统 植被变化 自然因素 社会经济条件 地理探测器 

分 类 号：Q948[生物学—植物学]