基于Landsat 8TM卫星数据的玉米灌浆期旱情监测

Drought Monitoring of Maize During Grain Filling Period Based on Landsat 8TM Satellite Data

以灌溉区大田玉米为研究对象,利用Landsat 8TM卫星数据把冠层含水量指数MSI2与温度指数LST结合构建冠层水分温度指数(CTWDI),对研究区2014~2016年大田玉米灌浆期旱情进行监测。结果表明,CTWDI与灌浆期玉米冠层含水量极显著相关(r=0.719**),可以较好地反应灌浆期高覆盖度玉米水分状况。基于CTWDI的灌浆期玉米干旱监测结果与实际情况相符,且Kappa系数均高于57%,改进了玉米生育中后期的旱情监测方法,可以利用CTWDI对灌浆期高覆盖度条件下的玉米进行干旱监测。

The irrigated farm maize was used as the research object, canopy water content index MSI2 com-bined with temperature index of LST to build the canopy water temperature index（CTWDI）, which data was fromLandsat 8 TM, and monitored the drought of study area field maize at filling stage in 2014-2016. The results showedthat the CTWDI and the maize canopy water content at filling stage were extremely significant correlation（r=0.719＊＊）, CTWDI hada better reaction on the condition of high coverage maize canopy moisture at the filling stage.The drought monitoring results of maize at filling stage based on CTWDI was consistent with the actual situation,and Kappa coefficient were higher than 57%, which improved the drought monitoring method of maize at latergrowth period. Therefore, the CTWDI could be used for drought regime monitoring at grain filling in maize underhigh coverage.