基于遥感修正作物系数的冬小麦需水量预测  

Prediction of Winter Wheat Water Demand Based on Remote Sensing Modified Crop Coefficient

作　　者：廖晋一 雷波[2] 苏涛[1] 刘巍[2] 张文发 朱菲 LIAO Jin-yi;LEI Bo;SU Tao;LIU Wei;ZHANG Wen-fa;ZHU Fei(School of Spatial Information and Geomatics Engineering,Anhui University of Science and Technology,Huainan 232001,Anhui Province,China;Department of Irrigation and Drainage,China Institute of Water Resources and Hydropower Research,Beijing 100048,China)

机构地区：[1]安徽理工大学空间信息与测绘工程学院,安徽淮南232001 [2]中国水利水电科学研究院水利研究所,北京100048

出　　处：《节水灌溉》2023年第3期48-52,60,共6页Water Saving Irrigation

基　　金：国家重点研发计划“国家水资源动态评价关键技术与应用”子课题“农业用水动态评价与需水预测”(2018YFC0407703);安徽理工大学引进人才科研启动项目(ZY030)。

摘　　要：作物需水量是确定灌溉制度和灌溉用水的重要依据。为准确预测冬小麦的需水量,以河北邯郸漳滏河灌区为例,利用sentinel-1A雷达影像反演灌区的土壤墒情以修正作物系数,并结合未来15 d的气象预报数据计算的参考蒸散发(ET_(0)),预测漳滏河灌区重要灌水期的冬小麦需水量。结果表明:通过遥感反演的土壤含水量与实测值相近,平均相对误差为4.60%;经气象预报数据预测研究区12月11-25日ET_(0)预测值为15.32 mm;结合土壤水分修正系数与预测ET_(0)数据,计算冬小麦平均需水量预测值为12.64 mm,其中,磁县需水量最大,为14.23 mm,广平县冬小麦需水量最小,为12.04 mm;由MOD16A2产品计算研究期平均需水量为10.65 mm,较预测值相对误差为18.69%。该方法可以有效地预测作物需水量及其空间分布,可为灌区作物生育期用水预测与管理提供理论参考。Crop water demand is an important basis for irrigation schedule.In order to accurately predict the water demand of winter wheat,Zhangfuhe irrigation area in Handan,Hebei Province was taken as an example,and the sentinel-1A radar image was used to retrieve the soil moisture in the irrigation area to correct the crop coefficient,combined with the reference evapotranspiration (ET_(0)) calculated from the weather forecast data in the next 15 days,to predict the demand for winter wheat in important irrigation periods of Zhangfu River irrigation area.The results showed that the soil water content retrieved by remote sensing was similar to the measured value,with an average relative error of 4.60%;the ET_(0)value of the study area from December 11 to December 25 was predicted to be 15.32 mm based on the meteorological forecast data;combined with the soil water content and the predicted ET_(0)data,the average water demand of winter wheat was calculated to be12.64 mm,among which,the water demand of Ci county had the largest water demand of 14.23 mm and Guangping county had the smallest of12.04 mm.The average water demand value calculated by MOD16A2 product was 10.65 mm,and the relative error was 18.69%.This method can provide a theoretical reference for the prediction and water management of the growth period of irrigation areas.

关 键 词：漳滏河灌区 冬小麦 需水量 预测 作物系数 

分 类 号：S271[农业科学—农业水土工程]