基于改进作物缺水指数的河南省冬小麦干旱监测  

Drought Monitoring of Winter Wheat in Henan Province Based on Improved Crop Water Scarcity Index

作　　者：李颖[1,2,3,4] 陈怀亮 梁辰[6] 贺添 李彤霄 Li Ying;Chen Huailiang;Liang Chen;He Tian;Li Tongxiao(CMA·Henan Key Laboratory of Agrometeorological Support and Applied Technique,Zhengzhou 450003,China;Henan Institute of Meteorological Sciences,Zhengzhou 450003,China;Zhengzhou Agrometeorological Field Observation and Research Station of Henan Province,Zhengzhou 450003,China;Zhengzhou Agrometeorological Field Science Experiment Base,CMA,Zhengzhou 450003,China;Liaoning Meteorological Service,Shenyang 110016,China;Shanghai Qingpu District Water Bureau,Shanghai 201715,China;Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]中国气象局·河南省农业气象保障与应用技术重点开放实验室,郑州450003 [2]河南省气象科学研究所,郑州450003 [3]河南省郑州农业气象野外科学观测研究站,郑州450003 [4]中国气象局郑州农业气象野外科学试验基地,郑州450003 [5]辽宁省气象局,沈阳110016 [6]上海市青浦区水务局,上海201715 [7]郑州大学,郑州450001

出　　处：《气象与环境科学》2024年第5期1-8,共8页Meteorological and Environmental Sciences

基　　金：中国气象局·河南省农业气象保障与应用技术重点开放实验室开放基金项目(AMF202408);国家自然科学基金项目(41805090)。

摘　　要：基于农业干旱遥感监测指标的干旱监测是简单且有效的手段,其中作物缺水指数CWSI通过反映植被供水状况在农业干旱监测中取得了良好的应用效果,但CWSI在反映植被水分实际状况时存在滞后性。在CWSI的基础上,通过增加LAI变化项表征作物形态受干旱影响的变化,构建一种改进的作物缺水指数CWSI_(IMP),以反映作物水分实际状况和作物受干旱影响的程度。计算结果表明,河南省冬小麦田的CWSI_(IMP)普遍低于CWSI,反映农业干旱程度较轻,与实际情况更为吻合。CWSI_(IMP)与20 cm土壤相对湿度的相关系数R^(2)为0.856,CWSI与20 cm土壤相对湿度的相关系数R 2为0.803,CWSI_(IMP)与20 cm土壤相对湿度的相关性显著优于CWSI。通过经验模型,将以20 cm土壤相对湿度为指标的干旱等级划分标准分别转换为以CWSI和CWSI_(IMP)为指标的干旱等级划分标准。典型区域分析表明,利用CWSI_(IMP)指标监测农业干旱等级较CWSI指标具有更高的可靠性和合理性,可为大面积农业干旱监测与评估、农田灌溉管理等提供科学依据。Drought monitoring based on the agricultural drought remote sensing monitoring index is a relatively simple and effective method.The crop water stress index(CWSI)has been widely applied in agricultural drought monitoring via reflecting vegetation water supply status,but it shows a lag in promptly reflecting actual vegetation water conditions.To address this limitation,an improved crop water stress index,CWSI_(IMP),is constructed on the basis of CWSI by adding LAI variation term to characterize crop morphology changes due to drought,so as to reflect the actual crop water status and the degree of drought-affected crops.The results show that CWSI_(IMP) values in winter wheat fields in Henan Province are generally lower than CWSI values,indicating milder agricultural drought conditions that align more closely with observation.The coefficient of determination(R^(2))between CWSI_(IMP) and 20 cm relative soil moisture is 0.856,highlighting a stronger correlation for CWSI_(IMP) compared to the R^(2) value of 0.803 between CWSI and 20 cm relative soil moisture.Empirical models are used to transform drought grade classifications based on 20 cm relative soil moisture into classifications based on both CWSI and CWSI_(IMP).Regional analysis demonstrates that using the CWSI_(IMP) index for monitoring agricultural drought grades in winter wheat areas of Henan Province is more reliable and scientific than using CWSI alone.This approach can provide a robust basis for large-scale farmland drought monitoring,evaluation and irrigation management.

关 键 词：CWSI LAI SEBS 遥感 

分 类 号：P49[天文地球—大气科学及气象学] S512.11[农业科学—作物学]