辽河干流流域植被盖度变化及其与气候因子的关系  

Vegetation Coverage Change and Its Relationship with Climate Factors in Liaohe River Watershed

作　　者：李一鸣[1] 苏芳莉[1,2] 李海福[1,2] 赵光辉[1] 

机构地区：[1]沈阳农业大学水利学院,沈阳110161 [2]辽宁双台河口湿地生态国家定位观测研究站,辽宁盘锦124112

出　　处：《沈阳农业大学学报》2017年第1期115-121,共7页Journal of Shenyang Agricultural University

基　　金：国家自然基金面上项目(31470710);国家水体污染控制与治理科技重大专项(2012ZX07202004)

摘　　要：为揭示辽河干流流域植被覆盖度时空变化规律及其对气候因子的响应特征,以1999~2013年为时间尺度,结合ArcGIS空间分析模块与数理统计,分析归一化植被指数(NDVI)与温度及降水量的年际动态、年内各月变化及空间区域变化特征。结果表明:1999~2013年间辽河干流流域NDVI整体呈上升趋势,分别在2000,2004,2008年达到极值0.339,0.405和0.409;辽河干流流域生态环境改善面积占流域总面积的26.91%,彰武、康平、阜新等地具有较好的代表性;年均NDVI受温度、降水量的影响均较显著,且NDVI对温度的响应程度高于降水量,对降水量的响应程度由东北向西南递减;1999~2013年间流域NDVI增速分别为夏季7.7%、秋季3.4%、春季1.5%和冬季1.4%,且夏、秋两季NDVI变化与全年NDVI变化具有较好的一致性。相关分析表明,流域范围内72.01%的区域NDVI与温度显著相关,表明温度是影响辽河干流流域年际植被覆盖度变化的主导气候因子;而年内植被盖度对降水量的响应存在一定滞后性,主要以冬季融雪与春季降水为表现形式。In order to reveal the vegetation coverage changes of time and space of Liaohe River Watershedand its response to climatic factors, taking the period of 1999-2013 as a time scale, through ArcGIS spatial analysis module and mathematical statistics,we analyzed the interannual dynamics, the monthly variation in the year and the spatial change between NDVI andtemperature withprecipitation. The NDVI of Liaohe River Watershed was overall in upward trend in 1999-2013, whichrespectively reached0.339, 0.405 and 0.409 in 2000, 2004 and 2008. The eological environment improvement area of Liaohe River Watershed accounted for 26.91% of the total area of the basin,and theecological environment that had a good representation in Zhangwu,Kangping and Fuxin. The effects of temperature and precipitation on the annual NDVI were significant,and the response of NDVI to temperature was higher than that of precipitation,and the response of NDVI to precipitation decreased from northeast to southwest. The growth rate of NDVI in the basin respectively reached 7.7% in summer, 3.4% in autumn, 1.5% in spring, 1.4%in winter, and the NDVI change trend in summer and autumn was the same as that in a full year.The correlation analysis showed that the NDVI had a significant correlation with temperature in 72.01% catchment area, which indicated that temperature was the main climate factor that influednced the annual vegetation coverage changes of Liaohe River Watershed, and that the response of vegetation cover to precipitation had a certain lag,which took mainly the winter snowmelt and spring precipitation as the form of expression.

关 键 词：辽河干流流域 植被覆盖度 时空演变 气候因子 

分 类 号：P461.7[天文地球—大气科学及气象学]