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引用本文:周延,靖磊,杨萌,史林鹭,吕偲,雷光春.不同出露时间下洞庭湖洲滩土壤及生态系统呼吸特征.湖泊科学,2018,30(6):1664-1671. DOI:10.18307/2018.0618
ZHOU Yan,JING Lei,YANG Meng,SHI Linlu,LV Cai,LEI Guangchun.Soil properties and ecosystem respiration characterization of mudflat in Lake Dongting during drawdown period. J. Lake Sci.2018,30(6):1664-1671. DOI:10.18307/2018.0618
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不同出露时间下洞庭湖洲滩土壤及生态系统呼吸特征
周延1,2, 靖磊2,3, 杨萌2,4, 史林鹭2, 吕偲2, 雷光春2
1.南京林业大学南方现代林业协同创新中心生物与环境学院, 南京 210037;2.北京林业大学自然保护区学院, 北京 100083;3.中南林业科技大学林学院, 长沙 410004;4.中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室, 北京 100039
摘要:
于2015年1月洞庭湖枯水期,针对不同出露时间下的洲滩,调查其土壤理化性质,并利用LI-8100便携式二氧化碳气体分析仪监测其生态系统呼吸.结果表明:在洞庭湖枯水期,洲滩出露后,洲滩土壤有机质、硝态氮、铵态氮和全氮含量随出露时间增长而先升高后降低.土壤溶解性有机碳含量是影响洞庭湖枯水期洲滩生态系统呼吸强度的最重要影响因子.溶解性有机碳含量随出露时间增长而提高,洲滩生态系统呼吸强度随之提高,并在洲滩出露约60天后达到最高值.出露洲滩生态系统呼吸通量均值为0.72±0.55 μmol/(m2·s),超过杨树林地、芦苇地和农田地,成为洞庭湖区冬季CO2排放最活跃的区域.
关键词:  洞庭湖  洲滩  退水期  土壤  生态系统呼吸
DOI:10.18307/2018.0618
分类号:
基金项目:林业公益性行业科研专项项目(200804005)和江苏高校优势学科建设工程项目(PAPD)联合资助.
Soil properties and ecosystem respiration characterization of mudflat in Lake Dongting during drawdown period
ZHOU Yan1,2, JING Lei2,3, YANG Meng2,4, SHI Linlu2, LV Cai2, LEI Guangchun2
1.Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, P. R. China;2.School of Nature Conservation, Beijing Forestry University, Beijing 100083, P. R. China;3.School of Forestry, Central South University of Forestry and Technology, Changsha 410004, P. R. China;4.Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100039, P. R. China
Abstract:
Soil properties from mudflat at different exposure duration level were investigated during the drawdown period of Lake Dongting in January 2015. The ecosystem respiration was also measured using LI-8100 soil CO2 flux system. After mudflat's exposing to the air, soil organic matters, soil nitrate nitrogen, soil ammonium nitrogen and soil total nitrogen contents increased at early time, then decreased. Dissolved organic carbon was the most important driving factor for the ecosystem respiration from mudflat during the drawdown period of Lake Dongting. The dissolved organic carbon value was monotonic increasing with the time of mudflat exposing to the air increasing, which strengthens ecosystem respiration from mudflat. The ecosystem respiration flux achieved peak value about 60 days after exposing to the air. The mean ecosystem respiration flux from mudflat was 0.72±0.55 μmol/(m2·s), exceeding the fluxes from poplars, reeds and farmlands. The exposed mudflat became the mainly active CO2 releasing area in Lake Dongting during the drawdown period.
Key words:  Lake Dongting  mudflat  drawdown  soil  ecosystem respiration
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