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Response patterns of simulated corn yield and soil nitrous oxide emission to precipitation change

Ecological Processes 2023年第1期12卷 247-259页

作者： Navneet Kaur Dafeng Hui Daniel M.Riccuito Melanie A.Mayes Hanqin Tian Department of Biological Sciences Tennessee State UniversityNashvilleTN 37209USA Environmental Sciences Division and Climate Change Science Institute Oak Ridge National LaboratoryOak RidgeTNUSA Schiller Institute for Integrated Science and Society Department of Earth and Environmental SciencesBoston CollegeChestnut HillMAUSA

background precipitation plays an important role in crop production and soil greenhouse gas ***,how crop yield and soil nitrous oxide(N_(2)O)emission respond to precipitation change,particularly with different background precipitations(dry,normal,and wet years),has not been well *** this study,we examined the impacts of precipitation changes on corn yield and soil N_(2)O emission using a long-term(1981-2020,40 years)climate dataset as well as seven manipulated precipitation treatments with different background precipitations using the DeNitrification-DeComposition(DNDC)*** Results showed large variations of corn yield and precipitation but small variation of soil N_(2)O emission among 40 *** corn yield and soil N_(2)O emission showed near linear relationships with precipitation based on the long-term precipitation data,but with different response patters of corn yield and soil N_(2)O emission to precipitation *** 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 *** extreme drought treatments reduced corn yield sharply in both normal and wet *** contrast,soil N_(2)O emission mostly responded linearly to precipitation *** in precipitation in the dry year reduced more soil N_(2)O emission than those in the normal and wet years,while increases in precipitation increased more soil N_(2)O emission in the normal and wet years than in the dry *** This study revealed different response patterns of corn yield and soil N_(2)O emission to precipitation and highlights that mitigation strategy for soil N_(2)O emission reduction should consider different background climate conditions.

关键词： background precipitation DNDC model precipitation change Response pattern Yield Soil N_(2)O emission

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