基于温度植被干旱指数的松辽平原干旱时空特征  

Spatiotemporal Change of Drought over the Songliao Plain Based on TVDI

作　　者：王婷婷[1] 张洪岩[1] 郭笑怡[1] 张正祥[1] 赵建军[1] 

机构地区：[1]东北师范大学地理科学学院,吉林长春130024

出　　处：《干旱区研究》2014年第3期383-389,共7页Arid Zone Research

基　　金：中央高校基本科研业务费专项资金(11SSXT134))资助

摘　　要：利用MODIS产品数据,采用TVDI方法,分析基于生态地理区的松辽平原干旱时空分布变化特征,探讨不同土地利用类型与干旱程度关系,结果显示:利用TVDI获取干旱情况与实际相符合,是进行干旱监测一种有效手段。反演结果与郑度等对此区域生态地理区划分一致:干旱年际变化差异较大,分布差异明显,2009年干旱分布面积最广,而2004年干旱面积最小;从干旱统计来看,2005年比2004年更湿润。研究区总体呈湿润趋势,湿润面积占总面积的84.95%,主要集中在耕地、林地和草地。水体类型不能利用TVDI方法进行干旱监测。Drought is a kind of natural disaster occurring frequently and affecting agricultural production in Chi- na, and it is important to improve the ecological environment, optimize the land allocation and water resources re- distribution, and relieve the shortage of ecological resources in arid zone. The MODIS sensor is significantly advan- tageous in monitoring land use change because of its high spectral resolution, high temporal resolution and appropri- ate spatial resolution. Temperature vegetation drought index （TVDI） is widely used, and there are many evidences to reveal that it is a reasonable and effective way in monitoring land use change related significantly to drought. TVDI is of an important theoretical significance in drought monitoring, crop irrigation, agricultural production, pas- ture conservation, forest fire detection, etc. By using TVDI method from MODIS product, the spatiotemporal distri- bution of drought can be derived to explore the relationship between different land use types and drought over the Songliao Plain based on coo-geographical regionalization. The eeo-geographieal regionalization system is based on the biological and non-biological factors. This study revealed that TVDI turns out to be an effective way to get drought conditions, and the result was consistent with Zheng Du＇s eco-geographical regionalization theory. Temporal and spatial variation of drought in the study area was quite different from different time and different subregions dur- ing the period from 2002 to 2009. The area of drought was the largest in 2009 but the smallest in 2004. Holistical- ly, the study area was in a wetting trend, and the proportion of wetting area including mainly tile cropland, wood- land and grassland was as high as 84.95 %. TVDI could not be used to monitor waters.

关 键 词：干旱 TVDI 生态地理区划 时空分布 MODIS产品数据 土地利用 

分 类 号：S812.29[农业科学—草业科学]