摘要
西南喀斯特石漠化区是国家重点治理的生态脆弱区域,该区尽管年降雨量大,但由于独特的水文特征,植被常因地质性缺水生长受到抑制.利用2000年至2004年中分辨率成像光谱辐射计(MODIS)归一化植被指数(NDVI)数据作为植被生长的指标参数,分析了石漠化发生后,植被对降雨变化的不同响应.结果表明:当年降雨量在900mm以下时,降雨量(气候性干旱)是制约植被生长的主要因素;在900mm以上,石漠化因素(地质性干旱)开始影响植被生长,石漠化地区NDVI与降雨量之间保持着较高的正相关性,主要集中在贵州的乌江上游、北盘江流域等石漠化典型的区域.
Rock desertification pervades the karst regions in Southwest China.In spite of a moderate annual precipitation there,temporary droughts occur frequently under the special geological background.In a study reported in this paper,we used Moderate Resolution Imaging Spectroradiometer （MODIS） 250m Normalized Difference Vegetation Index （NDVI） data from 2000 to 2004 as an indicator of vegetation growth to qualify how vegetation in this region responded to precipitation when rock desertification occurred.Our results suggested that climatic droughts exerted the major influence on vegetation growth under an annual precipitation of 900 mm,while geological droughts were found to be more influential under an annual precipitation of 900 mm.A positive correlation was observed between NDVI and precipitation in the rock desertification regions.The typical karst rock desertification regions were largely distributed in the upper reaches of the Wujiang River and the Panjiang River.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第12期140-144,共5页
Journal of Southwest University(Natural Science Edition)
基金
中科院知识创新重要方向项目(KZCX2-YW-306)
国家重点基础研究发展计划资助项目(2006CB403200)
国家科技支撑计划重大课题资助项目(2008BAD98B07)
作者简介
倪雪波（1981-），男，浙江嘉兴人，博士生，主要从事喀斯特石漠化的遥感监测与分析的研究．
通讯作者：王世杰。研究员．
