为了研究DNDC模型在华北平原典型作物-冬小麦的适用性,利用DNDC模型对冬小麦不同灌溉制度下小麦生长进行模拟和验证,并对模型精度进行评价。本试验基于2015和2016年冬小麦生育期实测数据,建立了不同灌溉制度下冬小麦DNDC模型,分析了不同作物参数对冬小麦生育期的生物量和产量的敏感性排序,率定和验证了DNDC模型参数,并对模型精度进行了评价。结果表明,作物需水量对产量和地上部生物量的敏感性较大；不同灌溉制度下冬小麦生育期的土壤水分、地上部生物量以及产量的实测值与模拟值的各项评价指标均在可接受范围内,DNDC模型可以较好的模拟华北地区冬小麦生育期间的土壤含水量、地上部生物量和产量,对冬小麦的生产有一定的指导意义。
Abstract
In order to study the applicability of DNDC model to winter wheat in typical crops of North China Plains,the DNDC model is used to simulate and verify the wheat growth under different irrigation regimes and the accuracy of the model is evaluated． Based on the measured
data of winter wheat growth period in 2015 and 2016,the DNDC model of winter wheat under different irrigation regimes is established,the sensitivity of different parameters is analyzed to soil moisture,biomass and yield during the growth of winter wheat． The DNDC Model
parameters are also calibrated and verified,and the accuracy of the model is evaluated in this study． The results show that,crop water demands are more sensitive to yield and above ground biomass． Under the different irrigation systems,the all evaluation indexes between the
measured value and the simulated value of soil moisture,above ground biomass and yield during the growth period of winter wheat were within acceptable range． DNDC model can simulate the soil moisture,above ground biomass and yield of winter wheat during growth period in North
China better,which is of guiding significance to the production of winter wheat．
关键词
DNDC模型 /
冬小麦 /
模型率定 /
模型验证
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基金
国家自然科学基金项目( 51479210) ; 水利部公益性行业
科研专项项目( 201501017) ; 现代农业产业技术体系建
设专项项目( Nycytx-35) 。
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