摘要
为揭示喀斯特石漠化治理示范区植被覆盖变化以及气候因子对植被覆盖变化的影响,利用2006—2015年Landsat 30 m/16 d分辨率影像数据,采用最大合成法、NDVI差值指数和相关、偏相关分析法,系统分析示范区归一化植被指数的时空变化特征及其与气候因子的关系。结果表明:(1)2006—2015年最大NDVI平均值为0.39,NDVI较高覆盖区域在示范区南北边界,而较低覆区域以花江南岸为主;(2)2006年以来示范区极低(-1.210)、低(-0.669)和中等(-0.729)植被覆盖度呈减少趋势,高(1.359)和极高(1.247)植被覆盖度增加,整体上呈显著增加趋势;(3)本月NDVI与本月、上月、上上月降雨量和气温的相关性均通过显著水平0.05检验,且本月NDVI与本月降雨量相关性高于本月气温(R_(NDVI降雨)=0.782),本月NDVI与上月气温相关性高于上月降雨量(R_(NDVI气温)=0.771);(4)在月尺度上,示范区植被生长对降雨量无滞后期,而对气温存在1个月的滞后期。
This paper studies the variation of vegetation coverage and the effect of climatic factors on the vegetation coverage in a demonstration area for reduction and control of karst rocky desertification.Based on the 30 m(16 d)resolution Landsat images during 2006-2015,using the method of maximum value composite(MVC),normalized difference vegetation index(NDVI),and correlation and partial correlation analyses,we systematically examine the spatial and temporal variation characteristics and the trend of vegetation index of the demonstration area and its relationship with climate factors.The results show that,(1)the annual maximum average value of NDVI between 2006 and 2015 is 0.39,which is higher in the north and south boundary regions of the demonstration area and lower in the south bank of the Huajiang river;(2)Since 2006,the places with extremely low(-1.210),low(-0.669)and moderate(-0.729)NDVI values exhibited a falling trend,those with high(1.359)and extremely high(1.247)increased overall significantly;(3)On the monthly scale,the NDVI of this month and the rainfall and temperature of this month,last month and month before the last one all pass the correlation coefficient test(P<0.05),and the correlation between NDVI and rainfall this month is higher than that between NDVI and temperature(R NDVI rainfall=0.782),the correlation between NDVI of this month and temperature of last month is higher than that between NDVI of this month and rainfall of last month(R NDVI temperature=0.771).(4)The vegetation growth of the demonstration area has no lag phase to rainfall,but a month lag to air temperature.
作者
曹洋
熊康宁
董晓超
肖华
全明英
CAO Yang;XIONG Kangning;DONG Xiaochao;XIAO Hua;QUAN Mingying(School of Karst Science,Guizhou Normal University/State Engineering Technology Institute for Karst Desertification Control,Guiyang,Guizhou 550001,China;Guizhou Acdemy of Sciences,Guiyang,Guizhou 550001,China)
出处
《中国岩溶》
CAS
CSCD
北大核心
2018年第6期850-858,共9页
Carsologica Sinica
基金
国家十三五重点研发计划课题"喀斯特高原石漠化综合治理生态产业模式与技术集成示范"(2016YFC0502607)
贵州省研究生教育创新计划项目"贵州省熊康宁喀斯特环境研究生导师工作室"(黔教研合GZS字[2016]04号)
贵州省科技计划课题(黔科合社G字[2012]4008)
关键词
关岭-贞丰示范区
植被覆盖度
植被变化
气候变化
相关性
Guangling-Zhenfeng demonstration area
vegetation coverage
vegetation variation
climate change
correlation
