摘要
为了探究盐水入侵对辽河口芦苇(Phragmites australis)沼泽土壤CH_4排放通量的影响,在辽河口芦苇沼泽采集土壤样品,配制盐度为0.7‰、1.5‰、3‰和6‰的4种盐水,采用原状土芯模拟和静态箱-气相色谱法,分别测定4种盐度盐水入侵下,土壤CH_4排放通量、植物地上生物量、土壤溶解性有机碳和微生物量碳含量。研究结果表明,整个实验期间,在4种盐度盐水入侵下,土壤CH_4排放通量平均值分别为9.01 mg/(m^2·h)、6.80 mg/(m^2·h)、6.77 mg/(m^2·h)和5.34 mg/(m^2·h);实验结束后,土壤溶解性有机碳质量比分别为754.8 mg/kg、602.2 mg/kg、579.5mg/kg和288.3 mg/kg,土壤微生物量碳质量比分别为1 797.1 mg/kg、967.5 mg/kg、895.3 mg/kg和480.8 mg/kg;盐水的盐度升高显著降低了土壤CH_4排放通量、土壤溶解性有机碳含量和微生物量碳含量;土壤CH_4排放通量分别与土壤溶解性有机碳、微生物量碳含量显著正相关,与芦苇地上生物量不相关;在盐水入侵条件下,生源有效碳含量可能是限制芦苇沼泽土壤CH_4排放通量的关键因子。
In order to study the effect of salt water intrusion on CH4 emission of soil in Phragmites australis marshes in Liaohe River estuary, soil sample were collected from and were intruded with salt water of 0.7%o, 1.5%o, 3%o and 6%q, respectively. The CH4 fluxes from the soil were periodically measured by the methods of undisturbed core and static chamber- gas chromatography, and plant above- ground biomass, soil dissolved organic carbon and microbial biomass carbon contents were determined at the end of experiment. The results showed that over the experimental period, the means of CH4 fluxes from the soil were 9.01 mg/(m^2 - h), 6.80 mg/(m^2- h), 6.77 mg/(m^2 - h) and 5.34 mg/(m^2- h) under intrusion of salt water of O.7‰, 1.5‰, 3‰ and 6‰, respectively. The contents of soil dissolved organic carbon were 754.8 mg/kg, 602.2 mg/kg, 579.5 mg/kg and 288.3 mg/kg, respectively, and contents of microbial biomass carbon were 1 797.1 mg/kg, 967.5 mg/kg, 895.3 mg/kg and 480.8 mg/kg. The increasing salinity significantly decreased the CH4 flux from the soil, dissolved organic carbon and microbial biomass carb on con tents. CH4 fluxes from the soil were significantly positively correlated with dissolved organic carbon and microbial biomass carbon and were not significantly correlated with above ground biomass. The results suggested that the quantity of available carbon might be a key limiting factor for the CH4 fluxes from the soil in Phragmites australis marshes as a response of salt water intrusion.
作者
沈庄
杨继松
袁晓敏
刘凯
宋常站
王金爽
SHEN Zhuang;YANG Jisong;YUAN Xiaomin;LIU Kai;SONG Changzhan;WANG Jinshuang(Environmental College,Shenyang University,Shenyang 110044,L iaoning,P.R.China;The Institute for Advanced Study of Coastal Ecology,Ludong University^ Yantai 110044,Shandong,P.R.China;Panjin Wetland Scientific Research Institute,Panjin 124000,Liaoning,P.R.China)
出处
《湿地科学》
CSCD
北大核心
2019年第1期100-105,共6页
Wetland Science
基金
国家自然科学基金项目(41571092和41871087)
国家重点研发计划专项课题项目(2017YFC0505902)
山东省高等学校优势学科人才团队培育计划项目"蓝黄两区滨海资源与环境团队"资助
关键词
CH4
盐度
芦苇沼泽
辽河口
methane
salinity
Phragmites australis marshes
Liaohe River estuary
