半干旱地区NDVI对气温和降水响应的多时间尺度分析——以甘肃省榆中县为例  

The multi-time-scale response of NDVI to temperature and precipitation in semiarid areas——A case study for Yuzhong County of Gansu Province

作　　者：罗隆诚[1] 王俊[1] 

机构地区：[1]西北大学城市与环境学院,西安710127

出　　处：《干旱区资源与环境》2011年第9期167-171,共5页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(30500077);陕西自然科学基础研究计划项目(2006D02)资助

摘　　要：半干旱地区植被覆盖与其水热条件有着密切的关系,文中以地处典型半干旱环境的甘肃省榆中县为例,通过定义的生长季连续时滞分析法、生长季记忆时滞分析法和持续时滞分析法3种时滞分析方法,应用归一化植被指数(NDVI)与气温和降水量进行旬、月、季三种不同时间尺度的时滞相关分析。结果表明:半干旱地区NDVI对气温的响应大于对降水的响应,且在月时间尺度上表现最为明显;通过3种方法对比,生长季连续时滞分析法最能够反映半干旱区NDVI对水热条件响应特征。但是,研究时间、空间尺度的不同以及植被类型的变化等都可能造成NDVI对降水、气温响应滞后时间的差异。The relationship between the vegetation cover of semiarid area and temperature and precipitation are compact.We analyzed the multi-time-scale responses of Normalized Difference Vegetation Index（NDVI） to temperature and precipitation by three different methods in each ten-day,month and quarter period covering 1998 to 2008 based on the SPOT VGT-NDVI data and temperature and precipitation data.The results indicated that on the whole,the response of NDVI to the variation of temperature was greater than to that of precipitation in semiarid areas,especially in monthly time scale.Comparing among these three different methods,the first method is the most effective method which can relationship the responses of NDVI to temperature and precipitation at semiarid area.However,the responses of NDVI to temperature and precipitation conditions will changed by other relative elements such as time scale,space scale and the type of vegetation.

关 键 词：NDVI 时滞 多时间尺度 榆中县 

分 类 号：Q948[生物学—植物学]