基于DHSVM模型的作物渍害时空分布信息提取

发布时间：2019-01-22 20:51

【摘要】：为了实时监测作物渍害时空分布,以湖北省监利县作为研究对象,采用分布式水文土壤植被模型-DHSVM(Distributed Hydrology Soil Vegetation Model)将监利县分成若干90 m×90 m的栅格单元,通过计算每个栅格单元的水平衡,达到模拟农田土壤水分状况的目的,结合作物轻、中、重度3种渍害的水分特征指标(地下水位埋深小于0.6 m,土壤表层相对体积含水率5 d的均值大于90%的持续期分别大于5、12、20 d)的方法,模拟监利县夏收作物不同渍害的时空分布。结果表明,模拟得到了2014年、2015年每年1—5月(夏收作物生长期间)监利县农田表层土壤水分和地下水位埋深的时空分布(时间分辨率为1 d,空间分辨率为90 m),首次实现了作物渍害的时空间分布信息提取;通过多次田间调查,证明此反演方法结果是准确的。
[Abstract]:In order to monitor the temporal and spatial distribution of crop damage in real time, Jianli County, Hubei Province, was divided into several grid units of 90 m 脳 90 m by using distributed hydrological soil vegetation model (DHSVM (Distributed Hydrology Soil Vegetation Model). By calculating the water balance of each grid unit, the purpose of simulating the soil moisture status of farmland is achieved, and the water characteristic indexes of light, moderate and severe crop damage are combined (the buried depth of groundwater level is less than 0.6 m, and the depth of groundwater table is less than 0.6 m). The mean value of soil surface relative volume water content in 5 days was more than 90%, the duration of which was more than 512 ~ (12) days, respectively, to simulate the temporal and spatial distribution of different soakage damage of summer harvest crops in Jianli County. The results show that the temporal and spatial distribution of surface soil moisture and groundwater table depth (temporal resolution 1 d, spatial resolution 90 m),) in Jianli County is obtained from January to May of 2015 (during the growing period of summer harvest crops) in Jianli County, and the results show that the temporal resolution is 1 day and the spatial resolution is 90 m),. The extraction of spatial distribution information of crop waterlogging was realized for the first time. Through many field investigations, it is proved that the inversion method is accurate.
【作者单位】：长江大学农学院;主要粮食作物产业化湖北省协同创新中心;
【基金】：2012年度公益性行业(农业)科研专项项目(201203032)
【分类号】：S422

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