基于无人机多光谱估算冬小麦作物系数

打开文本图片集

中图分类号：S127 文献标识码：A 文章编号：1000-4440（2025）06-1169-10

Abstract： Crop coefficient（ Kc ）is a critical parameter for quantifying crop water requirements，and its eficient and timelyacqusitionisssntialforoptimizing irigationmanagementandimprovingagricultural wateruseeficiency.Intisstudy， winterwheatwastakenastheresearchobject，andthecropcoeficientofwinterwheatwasestimatedbyusing thedualcropcoefficientapproachrecommendedbytheFoodandAgricultureOrganizationoftheUnited Nations（FAO），combinedwith theobserved winterwheat growth parameters（plantheight，，leafarea index）.Thecorrelationbetweeneightcommonvegetationindices （normalizeddiferencevegetationidex，renormalizeddiferencevegetationindex，soil-adjustedvegetationindex，rasfoed chlorophyllabsorptioinectaceindex，hacedvegetationindex，reennrmalizeddierencevgetatinindex，atiovege

tationindex，differencevegetation index）and Kc derived fromFAO-recommended methodswas analyzed at different growth stages（jointing，heading，and flowering periods） usingmultispectral imageryacquired throughunmannedaerial vehicle（UAV）remote sensing.According to the coefficient of determination （R2）， ，the appropriate vegetation index was

selectedto establishthecropcoeffcient estimationmodel.Cropcoeffcientvaluesestimatedbythe model werecomparedwith thoseobtainedbytheFAO-recommendedalgorithm.Theresultsshowedthatthenormalizeddiffrencevegetationindex（ NDW ）， renormalized difference vegetation index（ RDVI ），soil-adjusted vegetation index（SAVI）and transformed chlorophyll absorption in reflectance index （ TCARI ）had a good correlation with Kc during jointing stage to flowering stage. The crop coefficient estimation model of winter wheat based on TCARI/RDVI was more accurate. The root mean square errors （ RMSE ） at jointing stage， heading stage and flowering stage were 0.14 ，0.12 and O.15，respectively.The model effciency coefficients（ EF ）at jointing stage，headingstageandfloweringstage wereO.66，O.88and0.71，respecively.Thecropcoeficient distributionmapgenerated bythismodel can provide a scientific basis for reasonable irrigation of winterwheat.

Key words：winter wheat；unmanned aerial vehicle（UAV）；multispectral；crop coeficient；vegetation index

作物蒸散量（ET）包括土壤蒸发和植被蒸腾，是农田水分消耗的重要途径，亦是制定合理灌溉制度的基础[1-2]。（剩余12712字）