三江平原典型环型湿地土壤有机碳剖面分布及碳贮量

Distribution and Accumulation of Organic Carbon in Typical Annular Wetlands of the Sanjiang Plain

选取岛状林（棕壤型草甸白浆土）、小叶章草甸（潜育白浆土）和毛果苔草沼泽湿地（腐殖质沼泽土）研究了三江平原典型环型湿地土壤剖面有机碳分布特征与积累现状。结果表明，从环型沼泽湿地边缘向中心，土壤剖面有机碳含量和有机碳储量变化明显。小叶章草甸剖面土壤有机碳含量高于岛状林，但两者差异不大；毛果苔草沼泽湿地明显高于岛状林和小叶章草甸，最大值（为284．1g·kg^-1）出现在10-20cm，20cm以下明显下降。从环型沼泽湿地边缘向中心，土壤剖面有机碳储量明显增加。1m深度内有机碳储量分别为1．04、1．48和4．22×10^4t·km^-2。

Island forest （Brown meadow soil）, Calamagrostis angustifolia meadow （gleying albic bleached soil） and Carex lasiocarpa marsh （ humus mire soil） were chosen to analyze the depth profile distribution characteristics and accumulation of organic carbon in typical annular wetlands in Sanjiang Plan. The results showed that the content of organic carbon in soil profile and the storage of organic carbon in different soils varied obviously from margin to center of the annular wetland. The content of organic carbon in the soil profile of Calamagrostis angustifolia meadow was higher than that of island forest, but the difference was small. The content of organic carbon in the soil profile of Carex lasiocarpa marsh was much higher than that of island forest and Calamagrostis angustifolia meadow. The maximum was 284.1 g ·kg^-1 presented at the layer between 10cm and 20cm, while the content decreased obviously below the 20cm. Accordingly, from the margin to the center of the annular wetland, the storage of organic carbon increased significantly. Above soil depth of 1 m, the storage of organic carbon in the three type of soil were 1.04, 1.48 and 4.22×10^4t·km^-2, respectively.