CH4 REDUCTION IN RICE PADDY:TECHNOLOGY,CHALLENGE AND STRATEGY
Methane(CH4)is a potent greenhouse gas,and the reduction in CH4 emission can effectively and rapidly mitigate global warming.Rice paddy is the main source of CH4 emission in cropping systems.China is the largest rice producing and consuming country in the world.How to validly control CH4 emission in the promise of a stable supply of rice and food security is a challenge at present.In this study,we reviewed the estimation results of global CH4 emission in rice paddy,summarized the mitigation technologies and their effectiveness from the aspects of irrigation,fertilization,cultivar,tillage and cultivation,and explored the current mitigation polices.Therefore,the challenges regarding to CH4 reduction in Chinese rice paddy were analyzed,and the strategies and suggestions were proposed.The results indicated that mid-season drainage and water-saving irrigation were the key practices to reduce CH4 emission from rice paddy.Optimizing fertilization managements,improving straw/organics amendment,application of biochar,low-emission cultivar,direct-seeding rice and combination of rice planting and breeding would contribute to controlling CH4 emission.Aiming to lower CH4 emission in the context of increasing rice yield and farmers'profits,it was recommended to integrate current exiting reduction technologies,develop and popularize innovated and simplified technologies,establish monitoring,reporting,verification system,build up incentive mechanism,strengthen policy guidance for green and low-carbon agriculture,and formulate the national CH4 reduction pathways.Thus,CH4 emission from rice paddy can be effectively controlled through technological optimization and innovation,publicity and guidance,monitoring report and incentive subsidy.This study can provide reference for decision-making of CH4 reduction and green and low-carbon development in rice cultivation.
NETL
NSTL
万方数据
维普
