| 刘公英,申海凤,胡佳,史晓瑞,商彦蕊.基于TVDI指数的冬小麦旱情动态研究——以河北省邢台市为例[J].干旱地区农业研究,2015,33(4):227~232 |
| 基于TVDI指数的冬小麦旱情动态研究——以河北省邢台市为例 |
| Investigation on dynamic changes of drought of winter wheat by TVDI index——Taking the Xingtai in Hebei province as an example |
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| DOI：10.7606/j.issn.1000-7601.2015.04.34 |
| 中文关键词: 干旱监测 归一化植被指数 地表温度 温度植被干旱指数 邢台市 |
| 英文关键词:drought monitoring NDVI LST TVDI Xingtai Country |
| 基金项目:国家自然科学基金项目“区域农业旱灾适应性评价模型与风险防范模式研究”（41171402） |
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| 中文摘要: |
| 以重大干旱年份2010年为例，采用冬小麦生长期的MODIS数据，提取邢台市归一化植被指数（NDVI）和地表温度数据（LST），计算温度植被干旱指数（TVDI），制定农业干旱监测等级，利用该指标对邢台市2010年重大旱情进行分析，并利用降水数据和20 cm土壤湿度数据进行结果验证。结果显示：利用MOD11A2数据反演的地表温度与实测地表温度对比平均误差为0.295℃，反演结果能够代替实地温度进行计算；利用实测20 cm深度土壤相对湿度数据与该地区计算的TVDI值做线性拟合，拟合度R2最高为清河县站点0.722，最低是任县站点0.598，整体效果较好；从验证结果来看，TVDI能够较好地反映出邢台市整体的实际旱情。邢台市2010年冬小麦主要生长阶段中返青拔节阶段整体旱情等级较高，而且出现大面积重旱区域，进入抽穗阶段重旱区域减少，正常或湿润区域范围扩大，整体旱情减轻。 |
| 英文摘要: |
| Temperature Vegetation Dryness Index（TVDI）is an effective method for monitoring the dynamic changes of drought, and based on land surface soil moisture retrieval from optical and thermal-infrared remote sensing data. In 2010, TTVDI was calculated by Normalized Differential Vegetation Index (NVDI) and Land Surface Temperature (LST) data, that were derived from the MODIS data of winter wheat growing period in Xingtai county. We used TVDI for evaluate severe drought, and obtained a consistent result in comparison with the data of precipitation and soil moisture. The result showed that the deductive temperature of ground surface could be used as the actual value, considering the average error was 0.295℃ by a comparison between measured temperature and temperature retrieval from MOD11A2 data. There was a superior linear fitness between local TVDI value and relative humidity in 0～20 cm layer, with the maximal and minimal R2 were 0.722 of Qinghe and 0.598 of Renxia. These results suggest that TVDI can effectively reflect the actual drought in Xingtai county. |
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