摘要
地理要素时空异质性是山地景观的突出特征之一,其研究不仅使复杂地理格局和过程生动形象化,而且促进地理学定量化分析的发展。以2001年EVI（增强植被指数）、日降水和日气温为基础数据,利用ARCG IS栅格计算模块求得植被区域差异;以雨量变化为依据定量化出研究区30气象站点的雨季开始时间。结果显示：（1）无量山-哀牢山组合地形以西地区相对于东部地区EVI数值大、随季节变化和缓;（2）4月底、5月初,东部地区植被盖度先呈现增大态势,而随着时间推移其增强幅度明显弱于西部地区;（3）2001年雨季开始的具体时间方面,无量山-哀牢山组合地形以东地区相对于西部地区提前2-3候进入雨季。总之,由于高大山地对水汽输送的阻隔与截留作用,无量山-哀牢山组合地形成为研究区气候和植被时空分布格局差异的分界带。
The geographical spatio-temporal heterogeneity is a conspicusous characteristic in mountainous region.Its research visualized the complicated geographical patterns and processes,and promoted quantitative analysis in geography.The vegetation regional difference is calculated by raster calculator bar in ARCGIS,with MODIS-EVI as vegetation index in this study.Rainy season starting of 2001 is quantified from their precipitation variatons,including 30 data attracted from meteorological stations in southern Yunnan Province.The results show that：（1） the spatio-temporal difference of vegetation landscape is very remarkable,for EVI value shows higher averagely and variation slower down or up seasonally in the western of Wuliang Mt.-Ailao Mt.assemblage zone than in the eastern region;（2）there are serious differences in EVI vulue of different directions between these two regions at the end of April or early May.The vegetation coverage of the eastern region presents increase firstly in the middle of April of 2001,but with time going,its increase degree becomes weaker and weaker obviously than that in the western region;（3） the regional distinction is obvious in 2001 for the beginning time of rainy season is earlier with ten or fiffteen days in the eastern region.In one word,the Wuliang Mt.-Ailao Mt. assemblage zone becomes a boundary zone in the climatic characters and vegetation patterns,as the result of the effect for the high mountains on barrier or interception of vapor transportation.
出处
《生态学报》
CAS
CSCD
北大核心
2009年第1期223-230,共8页
Acta Ecologica Sinica
基金
河南理工大学博士基金资助项目(B2006-11)
国家重点基础研究发展计划(973项目)资助项目(2003CB415101)
关键词
滇南地区
EVI
时空异质性
地形因子
阻隔作用
Southern Yunnan Province
enhanced vegetation index
spatio-temporal heterogeneity
topographic factor
barrier function
