基于被动微波遥感的2008年广东省春季低温与典型作物寒害研究

以2008年作物寒害为例,基于AMSR|E亮温和地面气象温度数据构建了广东省气温反演模型,平均误差为2.5 ℃。寒害期间,全省最低气温均小于9 ℃,大部分地区降温幅度在5~15 ℃之间,降温持续天数均在10 d以上。综合最低气温、降温幅度和降温持续天数3个重要因子,构建了广东省寒害指数。结果显示,寒害程度从北部山区向南部沿海平原逐步递减:严重寒害主要发生在北部山区,较严重寒害发生在中部地区,以平行于海岸线的狭长带状形式分布,一般寒害和无寒害区域主要分布在沿海地区。其中,严重和较严重寒害约占省域总面积的40.1%,遭受严重寒害和较严重寒害的典型亚热带作物园地面积占总园地面积的49.61%。

Study on the Low Temperature and Chilling Injuries of Typical Crops Using Passive Microwave Remote Sensing in Guangdong Province during Snow Disaster of 2008

Using AMSR-E brightness temperatures and in-situ temperatures,this paper establish an air temperature inversion model(error=2.5 ℃) during the 2008 chilling injury.The minimum air temperatures are all smaller than 9 ℃.The temperature cooling duration in most areas is larger than 10 day.We further establish a chilling injury index based on three important chilling injury factors(minimum air temperature,air temperature difference and temperature cooling duration).The chilling injury degree gradually decreases from northern mountain areas to southern coastal plain areas.Severe chilling injury mainly occurs in northern mountain areas.Less severe chilling injury occurs mainly in central regions,paralleling to the coastline.General chilling injury and no chilling injury mainly distribute in coastal regions.The severe and less severe chilling injury equals to 40.1% of the total area of Guangdong.Orchards suffering severe and less severe chilling injury reach 49.61% of the total orchard area.