农业干旱监测指标研究进展

从传统监测指标和遥感监测指标两个方面对农业干旱表征指标进行了综述.传统农业干旱监测指标主要包括降水量指标、土壤含水量指标以及作物需水量指标等;遥感监测指标包含基于裸露地表和基于有植被覆盖地表的干旱遥感监测指标两大类.由于遥感方法具有大范围、宏观、动态监测的优势,目前得到了较为广泛的使用.未来农业干旱监测应建立广义的、适合于作物各时期的监测模型,并在此基础上对双层模型进一步简化.

Research Progress on Monitoring Indexes of Agricultural Drought

The agricultural drought index was reviewed from two aspects of the traditional monitoring index and remote sensing monitoring index.Traditional agricultural drought monitoring indexes include precipitation index,soil moisture content index,crop water requirement index;and remote sensing monitoring indexes are divided into two kinds of indexes which are based on the bare ground and based on the part of the vegetation or the vegetation covering the surface.The remote sensing method has been used widely at present due to advantages of large scopes,macro and dynamic monitoring.The general monitoring model which is suitable for each period of crops should be established for the agricultural drought monitoring in future as well as the double model should be simplified.