【摘要】 冬小麦晚霜冻指标与其发育阶段密切相关,通过分区域对河南省冬小麦拔节期进行研究,建立细化的晚霜冻遥感指标,可以精确监测冬小麦晚霜冻发生情况。以2018年4月3—8日河南省晚霜冻过程为案例,首先利用热惯量法反演地表温度,再根据相近时次地面观测气温对其进行订正,最后以地面观测当日最低气温对遥感反演最低温度进行推算,体现了地面观测温度的准确性和遥感反演的区域性的优势,利用晚霜冻区域化指标和遥感反演最低温度进行冬小麦晚霜冻的遥感监测。结果显示,这次晚霜冻主要发生在河南北部的新乡、鹤壁、安阳和中部的平顶山等地,发生灾害面积均在5%以上。和最低气温分布图对比结果显示,低温区域不一定发生晚霜冻害,这主要是因为不同区域的小麦发育期不同,而不同发育期形成冻害的气温不同。根据发育期建立的分区指标进行晚霜冻监测,监测结果与冻害发生实际情况相符。更多还原

【Abstract】 The index of late frost is closely related to the growth period of winter wheat.In order to accurately monitor the occurrence of late frost of winter wheat,a regional study was carried out in Henan province according to the annual value of jointing period of winter wheat,and the monitoring index of late frost was refined.The late frost process in Henan province was monitored by remote sensing from April 3 to 8,2018.Firstly,the thermal inertia method was used to retrieve the surface temperature,and then the temperature retrieved by remote sensing was revised according to the observed lowest temperature on the ground,which combines the accuracy of the surface temperature observation and the regional advantages of remote sensing retrieve.Finally,the regionalization index of late frost and the revised remote sensing inversion temperature were used to monitor late frost of winter wheat.The results showed that the late frost this time mainly occurred in Xinxiang,Hebi,Anyang and Pingdingshan areas,and the affected area was more than 5%.Compared with the distribution map of minimum temperature,we found that late frost does not necessarily occur in the area where the minimum temperature occurs.This is mainly the result of monitoring late frost by establishing sub-regional indicators according to different development stages,which is consistent with the actual situation of frost damage.更多还原