小兴安岭不同沼泽甲烷排放及其影响因子  

CH_4 emission and it's driving factors from different marshs in Xiaoxing'an Mountains,Northeast China

作　　者：石兰英[1] 牟长城[2] 田新民[1] 金建丽[1] 金志民[1] 

机构地区：[1]牡丹江师范学院生物系,牡丹江157012 [2]东北林业大学林学院,哈尔滨150040

出　　处：《生态学报》2010年第19期5289-5295,共7页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30670349);黑龙江省教育厅科研项目(11551515;11553118)

摘　　要：2007和2008年在植物生长季内采用静态箱-气相色谱法,研究了小兴安岭典型修氏苔草(Carex schmidtii)沼泽和油桦-修氏苔草(Betula ovalifolia-Carexschmidtii)灌木沼泽CH4通量的季节动态、年际动态及其与环境因子的关系,并估算了排放总量。结果表明,苔草和灌木沼泽2007年生长季CH4排放总量分别为66.60和3.20kg.hm-2;2008年分别为1482.60和18.15kg.hm-2。苔草和灌木沼泽CH4排放通量具有明显的季节变化,最大排放量出现在夏季或夏、秋季,其中,2007和2008年CH4排放平均通量分别为1.88和0.092mg.m-.2h-1,34.18和0.43mg.m-.2h-1,年际间和不同类型间排放差异均极显著。温度是季节变化的关键因子,2007年CH4排放通量和温度(空气温度、箱温、地表温度、5、10、15、20、30、40cm土温)间存在正、负两种相关关系,2008年CH4排放通量和温度呈正相关,水位是年际间和不同类型间排放差异的主要控制因子。The observation of CH4 fluxes was performed in the Carex schmidtii marsh and Betula ovalifolia-Carex schmidtii shrub swamp ecosystems of Xiaoxing＇an Mountains in the growing seasons of 2007 and 2008,using a static chamber and gas chromatography,to study the seasonal and inter-annual variations of CH4 flux and its relationships to environmental factors.The results showed that annual CH4 emissions from Carex schmidtii marsh and Betula ovalifolia-Carex schmidtii shrub swamp were,respectively,66.60 and 3.20 kg·hm-2 in 2007 and 1482.60 and 18.15 kg·hm-2 in 2008.There was an obvious seasonal changes in CH4 emissions during the whole observation period,with the largest emissions in summer or in summer and fall for both years（1.88 and 0.092 mg·CH4·m-2·h-1 for the marsh and shrub swamp in 2007 and 34.18 and 0.43 mg·CH4·m-2·h-1 in 2008）.There were significant differences of CH4 emissions between types of ecosystems and inter-annual changes.The seasonal variations of CH4 fluxes from both ecosystems were mainly associated with temperature,there were positive or negative relationships between CH4 fluxes and temperatures（air temperature,temperature inside the chamber,surface temperature and soil temperature of 0,5,10,15,20,30,40 cm）in 2007 and they were positively related in 2008.Water table was one of main indicators which can affect seasonal and inter-annual changes in CH4 fluxes from the marsh and shrub swamps.

关 键 词：CH4排放 苔草沼泽 灌木沼泽 水位 温度 

分 类 号：Q14[生物学—生态学]