水分及凋落物对若尔盖泥炭土CH_4排放的影响  

Effects of Soil Moisture and Litter on CH_4 Emission From Peat in Zoige Wetlands

作　　者：邓昭衡 张雪雯[1,2] 高居娟 高俊琴[1] 

机构地区：[1]北京林业大学自然保护区学院,北京100083 [2]杭州西溪湿地经营管理有限公司,浙江杭州310000

出　　处：《生态与农村环境学报》2015年第4期548-552,共5页Journal of Ecology and Rural Environment

基　　金：国家自然科学基金(41071329)

摘　　要：通过野外采样和室内培养试验,设置了饱和水分(100%田间持水量)、非饱和水分(60%田间持水量)和干湿交替处理3种土壤水分条件,以及添加和未添加凋落物2种处理,研究了若尔盖泥炭土CH4排放对不同土壤水分条件以及凋落物添加的响应。结果表明,不同土壤水分条件和凋落物添加及其交互作用对泥炭土CH4排放均有显著影响。相对于非饱和土壤水分,干湿交替促进了泥炭土CH4排放,而在持续的饱和水分条件下,泥炭土CH4排放量最高。凋落物添加促进了泥炭土CH4排放速率和累积排放量。饱和水分条件下,泥炭土CH4排放对凋落物添加响应最为迅速,干湿交替次之,非饱和水分条件下的响应最慢。Water is one of the key factors affecting CH4 emission in wetlands. To investigate effects of soil moisture content and litters on CH4 emission,an indoor incubation experiment was performed using peat collected from the Zoige Wetlands. The experiment was designed to have three treatments in soil moisture content [Treatment 60%（ unsaturated soil moisture,60% of soil water holding capacity）,Treatment 100%（ saturated soil moisture,100% of soil water holding capacity） and Treatment WDA（ wetting-drying alternation） ] and two treatments in litter（ with or without litters addition）.Results show that the effects of soil moisture and litters on CH4 emission from the peat were significant. Compared to Treatment 60%,Treatment WDA was significantly higher and Treatment 100% the highest in CH4 emission. Addition of litters promoted CH4 emission rate and cumulative emission in peat. CH4 emission from the peat responded the most quickly to litters addition in Treatment 100%,not so quickly in Treatment WDA and the slowest in Treatment 60%.

关 键 词：若尔盖湿地 泥炭土 凋落物 干湿交替 甲烷 

分 类 号：S153[农业科学—土壤学]