论文部分内容阅读
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。
Taking the field maize as the research object, the canopy water temperature index (CTWDI) was constructed by using the Landsat 8TM satellite data to combine the canopy water content index (MSI2) with the temperature index (LST) to monitor the drought in the field corn filling season in 2014-2016 . The results showed that the CTWDI was significantly and significantly correlated with the canopy water content (r = 0.719 **) during filling stage, which could well reflect the moisture content of maize with high coverage at filling stage. The results of CTWDI-based monitoring of maize drought at grain filling stage are consistent with the actual situation and the Kappa coefficients are higher than 57%, which improves the monitoring method of maize drought in the middle and later stages of maize. CTWDI can monitor the drought of maize under high coverage in filling period .