Response patterns of simulated corn yield and soil nitrous oxide emission to precipitation change
作者机构：Department of Biological Sciences Tennessee State University Environmental Sciences Division and Climate Change Science InstituteOak Ridge National Laboratory Schiller Institute for Integrated Science and Society Department of Earth and Environmental Sciences Boston College
出 版 物：《Ecological Processes》 (生态过程(英文))
年 卷 期：2023年第12卷第2期
页 面：32-44页
核心收录：
学科分类：083001[工学-环境科学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 08[工学] 070601[理学-气象学] 0818[工学-地质资源与地质工程] 09[农学] 0903[农学-农业资源与环境] 0706[理学-大气科学] 0901[农学-作物学]
基 金：supported by the Department of Energy(DOE)RDPP project National Science Foundation(NSF)MRI and EiR projects U.S. Department of Agriculture(USDA)projects Tennessee State University(TSU)RSP Seed Grant financially supported by the U.S. DOE Office of Biological and Environmental Research through the Terrestrial Ecosystem Science Scientific Focus Area at Oak Ridge National Laboratory(ORNL)
主 题：Background precipitation DNDC model Precipitation change Response pattern Yield Soil N 2 O emission
摘 要：Background Precipitation plays an important role in crop production and soil greenhouse gas emissions. However, how crop yield and soil nitrous oxide（N2O） emission respond to precipitation change, particularly with different background precipitations（dry, normal, and wet years）, has not been well investigated. In this study, we examined the impacts of precipitation changes on corn yield and soil N2O emission using a long-term（1981–2020, 40 years） climate dataset as well as seven manipulated precipitation treatments with different background precipitations using the De Nitrification-De Composition（DNDC） *** Results showed large variations of corn yield and precipitation but small variation of soil N2O emission among 40 years. Both corn yield and soil N2O emission showed near linear relationships with precipitation based on the long-term precipitation data, but with different response patters of corn yield and soil N2O emission to precipitation manipulations. Corn yield showed a positive linear response to precipitation manipulations in the dry year, but no response to increases in precipitation in the normal year, and a trend of decrease in the wet year. The extreme drought treatments reduced corn yield sharply in both normal and wet years. In contrast, soil N2O emission mostly responded linearly to precipitation manipulations. Decreases in precipitation in the dry year reduced more soil N2O emission than those in the normal and wet years, while increases in precipitation increased more soil N2O emission in the normal and wet years than in the dry *** This study revealed different response patterns of corn yield and soil N2O emission to precipitation and highlights that mitigation strategy for soil N2O emission reduction should consider different background climate conditions.
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