NDLI: Simulating greenhouse gas mitigation potentials for Chinese Croplands using the DAYCENT ecosystem model

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Year: 2014 Volume: 20 Issue: 2

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Simulating greenhouse gas mitigation potentials for Chinese Croplands using the DAYCENT ecosystem model

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Cheng, Kun Ogle, Stephen M. Parton, William J. Pan, Genxing
Spatial Coverage	China
Description	Country affiliation: United States Author Affiliation: Cheng K ( Institute of Resource, Ecosystem and Environment of Agriculture, and Center of Climate Change and Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing, Jiangsu, 210095, China)
Abstract	Understanding the potential for greenhouse gas (GHG) mitigation in agricultural lands is a critical challenge for climate change policy. This study uses the DAYCENT ecosystem model to predict GHG mitigation potentials associated with soil management in Chinese cropland systems. Application of ecosystem models, such as DAYCENT, requires the evaluation of model performance with data sets from experiments relevant to the climate and management of the study region. DAYCENT was evaluated with data from 350 cropland experiments in China, including measurements of nitrous oxide emissions $(N_{2}O),$ methane emissions $(CH_{4}),$ and soil organic carbon (SOC) stock changes. In general, the model was reasonably accurate with $R^{2}$ values for model predictions vs. measurements ranging from 0.71 to 0.85. Modeling efficiency varied from 0.65 for SOC stock changes to 0.83 for crop yields. Mitigation potentials were estimated on a yield basis (Mg $CO_{2}-equivalent$ $Mg^{−1}Yield).$ The results demonstrate that the largest decrease in GHG emissions in rainfed systems are associated with combined effect of reducing mineral N fertilization, organic matter amendments and reduced-till coupled with straw return, estimated at 0.31 to $0.83 Mg CO_{2}-equivalent$ $Mg^{−1}Yield.$ A mitigation potential of 0.08 to $0.36 Mg CO_{2}-equivalent$ $Mg^{−1}Yield$ is possible by reducing N chemical fertilizer rates, along with intermittent flooding in paddy rice cropping systems.
File Format	HTM / HTML
ISSN	13541013
Issue Number	3
Volume Number	20
e-ISSN	13652486
Journal	Global Change Biology
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2014-03-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Health Discipline Biology Agriculture Methods Air Pollutants Analysis Air Pollution Prevention & Control Greenhouse Effect Methane Models, Theoretical Nitrous Oxide Carbon China Computer Simulation Crops, Agricultural Ecosystem Soil Chemistry Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Global and Planetary Change

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