Assessment of CH_(4) flux and its influencing drivers in the rice-wheat agroecosystem of the Huai River Basin,China  

作　　者：Xiaolan Yu Fangmin Zhang Yanqiu Fang Xiaohan Zhao Kaidi Zhang Yanyu Lu 

机构地区：[1]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Jiangsu Key Laboratory of Agricultural Meteorology,College of Ecology and Applied Meteorology,Nanjing University of Information Science&Technology,Nanjing 210044,China [2]Anhui Institute of Meteorological Sciences/Anhui Province Key Laboratory of Atmospheric Science and Satellite Remote Sensing,Hefei 230031,China [3]Shouxian National Climatology Observatory,Huai River Basin Typical Farm Eco-Meteorological Experiment Field of China Meteorological Administration,Shouxian 232200,China

出　　处：《Journal of Integrative Agriculture》2024年第12期4203-4215,共13页农业科学学报（英文版）

基　　金：supported by the Natural Science Foundation of Jiangsu Province,China(BK20220017);the Innovation Development Project of China Meteorological Administration(CXFZ2023J073);the Key Research and Development Program of Anhui Province,China(2022M07020003);the Graduate Student Practice and Innovation Program of Jiangsu Province,China(SJCX22_0374)。

摘　　要：To understand the CH_(4) flux variations and their climatic drivers in the rice-wheat agroecosystem in the Huai River Basin of China,the CH_(4) flux was observed by using open-path eddy covariance at a typical rice-wheat rotation system in Anhui Province,China from November 2019 to October 2021.The variations and their drivers were then analyzed with the Akaike information criterion method.CH_(4) flux showed distinct diurnal variations with single peaks during 9:00-13:00 local time.The highest peak was 2.15μg m^(-2)s^(-1)which occurred at 11:00 in the vegetative growth stage in the rice growing season(RGS).CH_(4) flux also showed significant seasonal variations.The average CH_(4)flux in the vegetative growth stage in the RGS(193.8±74.2 mg m^(-2)d^(-1))was the highest among all growth stages.The annual total CH_(4) flux in the non-rice growing season(3.2 g m^(-2))was relatively small compared to that in the RGS(23.9 g m^(-2)).CH_(4) flux increased significantly with increase in air temperature,soil temperature,and soil water content in both the RGS and the non-RGS,while it decreased significantly with increase in vapor pressure deficit in the RGS.This study provided a comprehensive understanding of the CH_(4) flux and its drivers in the rice-wheat rotation agroecosystem in the Huai River Basin of China.In addition,our findings will be helpful for the validation and adjustment of the CH_(4) models in this region.

关 键 词：CH_(4) flux eddy covariance method rice-wheat rotation agroecosystem Huai River Basin 

分 类 号：S181[农业科学—农业基础科学]