沼泽湿地生态系统土壤CO_2和CH_4排放动态及影响因素  

Dynamics of CO_2 and CH_4 Concentration in the Mire Soil and Its Impact Factors

作　　者：宋长春 杨文燕[1] 徐小锋[1] 娄彦景[1] 张金波[1] 

机构地区：[1]中国科学院东北地理与农业生态研究所

出　　处：《环境科学》2004年第4期1-6,共6页Environmental Science

基　　金：中国科学院知识创新工程重大项目 (KZCX1 SW 0 1;KZCX3 SW 3 3 2和KZCX1 SW 19)

摘　　要：湿地在全球陆地生态系统碳循环中具有重要的作用 ,沼泽湿地温室气体排放特别是CO2 和CH4排放具有明显的时空变化特征 .沼泽湿地CO2 和CH4的产生和排放与土壤有机碳、溶解有机碳及氮素含量有密切关系 ,同时受土壤温度和水文条件的影响 .三江平原沼泽湿地土壤中CO2 和CH4具有较高的浓度值 ,浓集中心位于植物根层 (1 0～ 35cm) ,9月下旬到 1 0月中旬沼泽湿地植物地上部分枯死后 ,土壤中CH4和CO2 浓度有阶段性增加的趋势 ,且土壤中CO2 与CH4间呈显著正相关关系 .沼泽湿地生态系统呼吸及土壤呼吸对CH4排放通量也有较大的影响 。The wetland plays a important role in global carbon cycling in terrestrial ecosystem, the greenhouse gas emission in the mire, especially the CO 2 and CH 4 level, show distinctly spatial and temporal variation. The product and emission of the CO 2 and CH 4 are related to soil organic carbon (SOC), dissolved organic carbon (DOC) and nitrogen content, meanwhile which are affected by the soil temperature and hydrological condition. The concentration of CO 2 and CH 4 are high in mire soil in the Sanjiang plain, especial at the root layer(10～35cm). From the middle of September to October, the aboveground of plant came into die, but the CO 2 and CH 4 level increase significantly in mire soil, and show significantly positive relationship between them. The ecosystem respiration and the soil respiration affected the methane emission distinctly, also with the significantly positive relationship.

关 键 词：沼泽湿地 土壤 温室气体 有机碳 生态系统呼吸 

分 类 号：X511[环境科学与工程—环境工程]