摘要
盐沼湿地作为陆海交互作用的过渡带是CH4重要的自然来源。潮汐活动通过影响CH4的产生、氧化和传输驱动了湿地CH4间歇性、周期性的排放。利用涡度相关和微气象监测技术,对黄河三角洲一个盐地碱蓬生态系统CH4通量、环境因子和水文要素(潮汐)进行了长期连续监测分析了该生态系统生长季CH4排放的季节动态及潮汐作用对CH4排放的影响。结果表明:生长季该生态系统是CH4的排放源,排放日均值为0.063 mg m-2 h-1,(范围为-0.36—0.57 mg m-2 h-1)。潮汐淹水阶段和落潮后湿润阶段表现为CH4的显著源。此外我们发现,短期潮汐活动引起土壤干湿状况的变化促进了CH4脉冲式的排放,因此未来气候变化下温度升高和降雨季节分配引起的土壤干湿变化将会对该区域CH4排放甚至碳循环产生积极影响。
Salt marshes are coastal wetlands that are considered to be a potential natural source of methane(CH4).By controlling the production,oxidation,and transport of CH4 in soils,tidal action drives the episodic and high?magnitude emissions of CH4 from coastal wetlands.Using the eddy covariance technique,we measured the CH4 fluxes,environmental factors,and tidal dynamics in a salt marsh in the Yellow River Delta in China.We aimed to investigate the dynamics of CH4 emissions in the growing season and to analyze the effect of tidal action on CH4 emission.The results showed that the mean daily methane was 0.063 mg m-2 h-1,ranging from-0.36 to 0.57 mg m-2 h-1,during the growing season.Tidal flooding and the wet stage after tides are the significant sources of CH4.Drying and wetting cycles induced by short?term tides resulted in pulsed CH4 emissions.Therefore,the soil drought and wetting induced by increasing temperatures and precipitation distribution under climate change will positively impact CH4 emissions and the carbon cycle in the region.
作者
贺文君
韩广轩
宋维民
李培广
张树岩
张希涛
HE Wenjun;HAN Guangxuan;SONG Weimin;LI Peiguang;ZHANG Shuyan;ZHANG Xitao(Key Laboratory of Coastal Environmental Processes and Ecological Remediation,Chinese Academy of Science,Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai 264003,China;University of Chinese Academy of Sciences,Beijing 100049,China;Administration Bureau of the Yellow River Delta National Nature Reserve,Dongying 257500,China)
出处
《生态学报》
CAS
CSCD
北大核心
2019年第17期6238-6246,共9页
Acta Ecologica Sinica
基金
国家自然科学基金项目(41671089)
中国科学院科技服务网络计划项目(KFJ-STS-ZDTP-023)
中国科学院“十三五”信息化建设专项(XXH13506)
关键词
甲烷
潮汐作用
干湿循环
盐沼湿地
methane
tidal action
drying and wetting cycles
salt marsh
