基于通量测量的稻田甲烷排放特征及影响因素研究  

Characteristics and Drivers of Methane Fluxes from a Rice Paddy Based on the Flux Measurement

作　　者：宋朝清 刘伟[3] 陆海波 袁文平 Song Chaoqing;Liu Wei;Lu Haibo;Yuan Wenping(State Key Laboratoiy of Cryospheric Sciences,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China;Guangdong Province Key Laboratory for Change and Natural Disaster Studies,School of Atmospheric Sciences,Sun Yat-sen University,Guangdong Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory,Guangdong Zhuhai 519082,China)

机构地区：[1]中国科学院西北生态环境资源研究院,冰冻圈科学国家重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]中国科学院植物研究所,植被与环境变化国家重点实验室,北京100093 [4]中山大学大气科学学院,广东省气候变化与自然灾害研究重点实验室,广东珠海519082 [5]南方海洋科学与工程广东省实验室,广东珠海519082

出　　处：《地球科学进展》2019年第11期1141-1151,共11页Advances in Earth Science

基　　金：国家自然科学基金面上项目“气候和土地利用变化对陆地—河流碳通量的影响研究”（编号：31870459）资助~~

摘　　要：稻田是大气甲烷(CH4)的重要来源之一,会直接加剧全球气候变暖。基于涡度相关方法,通过对湖南省益阳市水稻田的CH4通量进行连续测量,探讨来自水稻田的CH4通量特征、动态及其影响因素。结果表明:①该地区水稻田的CH4通量具有显著的季节性变化特征,即在水稻营养生长阶段CH4通量最大,随后逐渐减少,在休耕阶段CH4通量最小。②该地区水稻田的CH4通量在水稻营养生长和生殖生长阶段具有明显的日变化,在14:00-16:00达到日通量峰值,但在休耕阶段,CH4通量没有显著的日变化。③空气温度是该地区水稻田CH4通量季节性变化最重要的控制因子,饱和水汽亏缺对CH4通量的季节性变化也具有一定影响。④该地区水稻田的最大日平均CH4通量为0.69μmol/(m2·s),出现在水稻营养生长阶段后期,整个观测时段的CH4排放总量约为28 g C/m2。Rice paddies are an important anthropogenic source of methane(CH4)to the atmosphere,which aggravate the global warming greatly.CH4 fluxes from a rice paddy in Central China were continuously measured with the eddy covariance method in 2018.The characteristics,dynamics and drivers of the observed CH4 fluxes from this paddy field were subsequently analyzed.The results indicated that①a distinct seasonal variation of daily CH4 fluxes was found over the whole observed period.Daily CH4 fluxes were the highest in the vegetative period,then decreased gradually,and became the lowest in the fallow period;②observed CH4 fluxes had a clear single-peak diurnal pattern during the vegetative and reproductive periods,and reached daily peaks at about14:00-16:00.However,no obvious diurnal variation in CH4 fluxes was observed during the fallow period;③air temperature was the most important drivers that controlled the seasonal variation of CH4 fluxes from this paddy field,and Vapor Pressure Deficit(VPD)was also found related to the CH4 emissions;④the largest daily CH4 flux was 0.69μmol/(m2·s),occurred in the late of vegetative period,and the total amount of CH4 emissions over the whole observed period was about 28 g C/m2.

关 键 词：涡度相关 水稻田 CH4通量 

分 类 号：P412.1[天文地球—大气科学及气象学] P49