基于DHSVM模型的作物渍害时空分布信息提取  

Calculating Spatio-spatial Distribution of Waterlogged in Jianli County Using the DHSVM Model

作　　者：熊勤学[1,2] 田小海[1,2] 朱建强[1,2] 

机构地区：[1]长江大学农学院,湖北荆州434025 [2]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,湖北荆州434025

出　　处：《灌溉排水学报》2017年第6期109-116,共8页Journal of Irrigation and Drainage

基　　金：2012年度公益性行业(农业)科研专项项目(201203032)

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。We calculated the spatio-spatial distribution of waterloggingin Jianli County of Hubei province using the DHSVM model （The Distributed Hydrology Soil Vegetation Model）. The region in the county was divided in- to a number of grids, each being 90 m×90 m. The dynamic of soil moisture in each grid was simulated using a wa- ter balance model. We calculated the distribution of waterlogging in summer by classifying the waterlogging into three categories when the groundwater table was less than 0.6 m deep： when the duration of five-day average vol- umetric water higher than 90% lasted more than 5 days （light waterlogging）, or lasted more than 12 days （moder- ate waterlogging）, or lasted more than 20 days （severe waterlogging）. We simulated the distribution of soil mois- ture and groundwater table in all grids from January to May in 2014 and 2015 during the growing season of sum- mer crops using a temporal resolution of one day. These results enabled us to predict the spatio-temporal distribu- tion of waterlogging in the region for the first time. This retrieval method was proven accurate after testing in sev- eral fields.

关 键 词：渍害 DHSVM模型 时空分布 

分 类 号：S422[农业科学—植物保护]