| 摘要: |
| 水分亏缺指数(WDI)是综合陆地表面温度和植被指数建立的区域干旱遥感监测评价指标.本研究利用1982-2001年NOAA AVHRR资料计算了全国20年间各旬WDI,提出基于WDI判断农田受旱及受旱成灾的标准,结合土地覆盖分类提取的耕地范围,提取我国1982-2001年间各年份受旱和受旱成灾耕地面积.结果表明:利用遥感手段提取农田受旱面积具有一定参考价值,遥感获取的农田受旱成灾面积与统计结果基本一致,是快速有效获取干旱成灾范围和成灾面积的方法. |
| 关键词: 水分亏缺指数 遥感 耕地 旱灾 受旱成灾 |
| DOI：10.11841/j.issn.1007-4333.2008.06.124 |
| 分类号:S1 |
| 基金项目:国家自然科学基金，江西省教育厅科研项目 |
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| Study on remotely sensed drought-stricken and drought-damaged farmland in China during 1982 to 2001 |
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QI Shu-hua LI Zhao-liang WANG Chang-yao
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| Abstract: |
| In this paper,Water Deficit Index(WDI) was introduced briefly and was estimated with NOAA-AVHRR 10-day composite dataset of NDVI,CH4 and CH5 light temperature.Based on the 10-day WDI images,the pixels that represent the drought-stricken farmland and the drought-damaged farmland were picked up for each year.Only when more than one decade WDI during crop development period from March to October was greater than 0.7,the pixel was thought as drought-stricken.And more than two continuous decades WDI were greater than 0.75,the pixel was treated as drought-damaged.With the criterion,the drought-stricken and drought-damaged farmland in China was estimated during 1982-2001 with the assistance of farmland distribution map.The comparison between remotely sensed and statistical drought-stricken and drought-damaged farmland areas showed that it is disagreement in the early 1980s,while remotely sensed drought-stricken farmland areas could be reference data and remotely sensed drought-damaged farmland areas were consistent with the statistical data. |
| Key words: water deficit index,remote sensing,farmland,drought,drought-damaged,China |
