文献类型：期刊文献

中文题名：若尔盖高原湿地不同微地貌区甲烷排放通量特征

英文题名：Characteristics of methane emission fluxes in the Zoigê Plateau wetland on microtopography

作者：周文昌[1,2] 崔丽娟[1] 王义飞[1] 李伟[1] 康晓明[1]

第一作者：周文昌

机构：[1]中国林业科学研究院湿地研究所湿地生态功能与恢复北京市重点实验室;[2]湖北省林业科学研究院

年份：2016

卷号：40

期号：9

起止页码：902-911

中文期刊名：植物生态学报

外文期刊名：Chinese Journal of Plant Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：中国清洁发展机制基金赠款项目(2012076);中国林业科学研究院林业新技术研究所基本科研业务费专项(CAFINT2014K06)的资助

语种：中文

中文关键词：甲烷排放通量;草丘;洼地;平坦地;若尔盖高原湿地

外文关键词：CH4 emission flux; hummock; hollow; lawn; Zoige Plateau wetland

分类号：S863

摘要：若尔盖高原是我国泥炭沼泽湿地的主要分布区、青藏高原的主要甲烷(CH4)排放中心。为了研究湿地微地貌环境对高原湿地CH_4排放通量的影响,2014年5–10月,采用静态箱和快速温室气体分析仪原位测量若尔盖高原湖滨湿地3种泥炭沼泽5种微地貌环境下的CH4排放通量特征。结果表明:(1)常年性淹水泥炭湿地洼地(P-hollow)和草丘(P-hummock)生长季平均CH_4排放通量为68.48和40.32 mg·m^(–2)·h^(–1),季节性淹水的泥炭湿地洼地(S-hollow)和草丘(S-hummock)平均CH_4排放通量为2.38和0.63 mg·m^(–2)·h^(–1),而无淹水平坦地(Lawn)平均CH_4排放通量为3.68 mg·m^(–2)·h^(–1);(2)湿地5种微地貌区CH4排放通量为(23.10±30.28)mg·m^(–2)·h^(–1)(平均值±标准偏差)),变异系数为131%。分析显示这5种微地貌区CH_4排放通量的平均值与其水位深度平均值存在显著的线性正相关关系(R2=0.919,p<0.01),表明水位深度是控制湿地微地貌区CH4排放通量空间变化的主要因子;(3)P-hummock、P-hollow和S-hummock的CH_4排放通量存在显著的季节变化,Lawn和S-hollow无明显的季节性变化,但5种微地貌区在夏季或秋季均观测到CH_4排放通量峰值,其影响因子可能与水位深度、土壤温度和凋落物输入密切相关;(4)P-hollow可能时常发生冒泡式CH_4排放,这可能导致过去低估了若尔盖高原湿地的CH_4排放量。
Aims The Zoig6 Plateau, as a very important wetland distribution region of China, was the major methane （CH4） emission center of the Qinghai-Xizang Plateau. The objective of this study is to study the effects of microtopog- raphic changes on CH4 emission fluxes from five plots across three marshes in the littoral zone of the Zoig6 Pla- teau wetland. Methods CH4 emission fluxes were measured in five plots across three marshes in Zoig~ Plateau wetland using the closed chamber method and Fast Greenhouse Gas Analyzer from May to October in 2014. Important findings During the growing season, mean CH4 emission fluxes from the permanently flooded hol- low （P-hollow） and hummock （P-hummock） in the Zoige Plateau wetland were 68.48 and 40.32 mg·m-2·h-1, while mean CH4 emission fluxes from the seasonally flooded hollow （S-hollow） and hummock （S-hummock） were 2.38 and 0.63 mg·m-2·h-1. CH4 emission fluxes from non-flooded lawn was 3.68 mg·m-2·h-1. Mean CH4 emission fluxes from five plots across three sites was 23.10 mg·m-2·h-1, with a standard deviation of 30.28 mg·mZ·h-1 and the coefficient of variation was 131%. We also found that there was a significant and positive cor- relation between mean CH4 emission fluxes and mean water table depth in the five plots across three sites （R2= 0.919, p 〈 0.01）, indicating that water table depth was controlling the spatial variability of CH4 emission fluxes from the Zoig~ Plateau wetland on microtopography. CH4 emission fluxes in the P-hollow, P-hummock, and S-hummock showed an obvious seasonal pattem, which was not observed in the lawn and S-hollow. However, CH4 emission peaks were observed in all the plots during summer and/or autumn, which could be closely related to the water table depth, soil temperature, and the magnitude of litter mass. In addition, we found that the CH4 emission flux in the P-hollow was much higher than the other four plots in the Zoig~ Plateau wetland, suggesting that CH4 in the P-hollow could be often transported to the surface by ebullition and CH4 emission from the Zoig~ Plateau wetland may be under estimated in the past.