• 关键词：湿地土壤  微生物量碳  可溶性有机碳  总有机碳  酶活性

• 基金项目：国家自然科学基金(No.40771189);中国科学院重要方向性项目(No.kzcx2-yw-309);中国科学院“东北振兴”项目(No.DBZX-2-024)

• 万忠梅
• 1. 中国科学院东北地理与农业生态研究所, 长春 130012; 2. 中国科学院研究生院, 北京 100049

• 宋长春
• 中国科学院东北地理与农业生态研究所, 长春 130012

• 杨桂生
• 1. 中国科学院东北地理与农业生态研究所, 长春 130012; 2. 中国科学院研究生院, 北京 100049

• 黄靖宇
• 1. 中国科学院东北地理与农业生态研究所, 长春 130012; 2. 中国科学院研究生院, 北京 100049

• 王丽丽
• 1. 中国科学院东北地理与农业生态研究所, 长春 130012; 2. 中国科学院研究生院, 北京 100049

• 李英臣
• 1. 中国科学院东北地理与农业生态研究所, 长春 130012; 2. 中国科学院研究生院, 北京 100049

• 摘要：对三江平原3种主要类型天然湿地(毛苔草湿地、小叶章湿地、岛状林湿地)0～20cm土壤活性有机碳(土壤微生物量碳、土壤可溶性有机碳)特征进行了研究,分析了不同湿地的土壤活性有机碳与土壤总有机碳及酶活性间的关系.结果表明:不同类型湿地的土壤活性有机碳组分含量存在较大的差异,土壤活性有机碳、土壤总有机碳及土壤脲酶、蔗糖酶、淀粉酶、过氧化氢酶的变化趋势具有基本近似的特征,表现为毛苔草湿地>小叶章湿地>岛状林湿地;土壤微生物量碳、可溶性有机碳与土壤总有机碳和酶活性存在显著正相关关系,其中,酶活性与土壤微生物量碳相关性最为显著.另外,毛苔草湿地土壤MBC/SOC、DOC/SOC的比值低于其它2种类型湿地,表明毛苔草湿地生物活性有机碳库的周转速率低,淹水抑制了微生物和酶的分解作用,有利于土壤有机碳的累积.因此,沼泽湿地水文条件的变化将会对土壤碳累积与分解过程产生较大的影响.

• Abstract：The active Soil Organic Carbon (SOC), which involves Microbial Biomass Carbon (MBC) and Dissolved Organic Carbon (DOC) was investigated over a 0～20 cm depth profile in three types of marshes (Carex lasiocarpa, Calamagrostis angustifolia and island forest marshes) in the Sanjiang Plain. And the relationships between active SOC, total SOC and enzyme activities were analyzed. Active SOC differed considerably among the different marshes. The active and total SOCcontents decreased in the order Carex lasiocarpa marsh > Calamagrostis angustifolia marsh > island forest marsh. And the activities of invertase, urease, amylase and catalase decreased in the same order. Through Pearson correlative analysis, MBC and DOC were significantly positively related to total SOC and soil enzyme activities,and the enzyme activities had a closer correlation with MBC than DOC. Although the active soil organic carbon pool in the Carex lasiocarpa marsh was the greatest, the ratios of MBC and DOC to total SOC in the marsh were the lowest. This suggests that the turn-over rate of the microbially active carbon pool in the Carex lasiocarpa marsh was very low. Water flooding inhibited microbial activity, which was beneficial to the accumulation of soil organic carbon. Therefore, if the water conditions of a marsh change, it will affect the accumulation and decomposition processes of the soil carbon.

• Key words：marsh soil  Microbial Biomass Carbon (MBC)  Dissolved Organic Carbon (DOC)  soil organic carbon  enzyme activity

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