淮河流域稻麦轮作农田甲烷通量变化特征  

Characteristics of CH_4Flux over Rice-Wheat Rotation Fields in Huaihe River Basin

作　　者：李侠丽 段春锋[3] 冯颖 潘先洁 王雅正 邵陈丽 燕少威 张国玲 LI Xiali;DUAN Chunfeng;FENG Ying;PAN Xianjie;WANG Yazheng;SHAO Chenli;YAN Shaowei;ZHANG Guoling(Shouxian National Climatology Observatory,Huaihe River Basin Typical Farm Eco-meteorological Experiment Field of CMA,Anhui,Shouxian 232200;Meteorological Bureau of Shouxian,Anhui,Shouxian 232202;Anhui Climate Center,Hefei 230031;Anhui Meteorological Obervatory,Hefei 230031;Meteorological Bureau of Huainan City,Anhui,Huainan 232000)

机构地区：[1]安徽省寿县国家气候观象台/中国气象局淮河流域典型农田生态气象野外科学试验基地,寿县232200 [2]安徽省寿县气象局,寿县232200 [3]安徽省气候中心,合肥230031 [4]安徽省气象台,合肥230031 [5]安徽省淮南市气象局,淮南232000

出　　处：《气象科技》2023年第5期764-770,共7页Meteorological Science and Technology

基　　金：淮南市科技计划项目(2021A281);安徽省气象局研究型业务科技攻关项目(YJG202005)共同资助。

摘　　要：利用寿县国家气候观象台开路式甲烷气体分析仪的观测数据,分析了淮河流域稻麦轮作农田不同生育期甲烷通量变化特征及其影响因素。结果表明:淮河流域甲烷通量一年中呈单峰型分布,峰值出现在夏季。甲烷通量日变化呈单峰型分布,峰值出现在午后,白天高于夜间。水稻生育期甲烷通量明显高于小麦生育期;小麦出苗期甲烷通量最小,成熟期最大,达到0.14μg·m^(-2)·s^(-1);水稻拔节期甲烷通量最大,达到3.02μg·m^(-2)·s^(-1)成熟期最小,为0.12μg·m^(-2)·s^(-1)。作物生物量对甲烷通量影响明显,水稻和小麦收割前后24 h甲烷通量降幅达到50%和30%。甲烷通量与降水、相对湿度、水汽压、土壤温度、气温均呈显著的正相关关系。降水量越大,湿度越大,温度越高,甲烷通量就越大。Based on the observation data of the open-circuit CH_(4)gas analyzer at Shouxian National Climatological Observatory,we analyze the variation characteristics and influencing factors of CH_(4)flux in different growth periods of rice-wheat rotation farmland in the Huaihe River Basin.The results show that CH_(4)flux in the Huaihe River Basin has a single peak distribution throughout the year,with the peak occurring in summer.The diurnal variation of CH_(4)flux shows a single peak during the day,and the peaks mostly appear in the afternoon.CH_(4)flux during the day is higher than at night.CH_(4)flux in the rice growth period is significantly higher than that in the wheat growth period.During the wheat growth period,CH_(4)flux is the smallest during the seedling period but the largest during the mature period,reaching 0.14μg m^(-2)s^(-1).During the rice growth period,the maximum CH_(4)flux during the jointing period is 3.02μg m^(-2)s^(-1),and the minimum during the maturity stage is 0.12μg m^(-2)s^(-1).CH_(4)flux decreases by 50%and 30%before and after the harvest of rice and wheat.This study shows that crop biomass has a significant impact on CH_(4)flux.CH_(4)flux is positively correlated with precipitation,relative humidity,water vapour pressure,soil temperature,and air temperature.When precipitation,humidity,or air temperature is higher,the CH_(4)flux will be greater.

关 键 词：甲烷通量 稻麦轮作 气象要素 淮河流域 

分 类 号：P49[天文地球—大气科学及气象学]