三江平原典型环型湿地土壤DOC剖面分布及储量

Distribution and Storage of DOC in a Typical Annular Wetland of Sanjiang Plain

选择三江平原典型环型湿地,分层采集岛状林、小叶章草甸和毛果苔草沼泽湿地土壤,调查了土壤DOC含量、储量水平和垂直分布状况,分析了环型湿地特殊的水文地貌条件对DOC分布的影响。结果表明,环型湿地土壤DOC含量均随着土层深度增加而不断减小;毛果苔草沼泽湿地土壤剖面的DOC含量显著高于小叶章草甸和岛状林,小叶章草甸和毛果苔草沼泽湿地剖面DOC含量显著高于岛状林;环型沼泽湿地土壤DOC累积现状为小叶章草甸土壤剖面DOC储量最大,岛状林其次,毛果苔草沼泽湿地最小,其60cm深度内土壤DOC储量分别为0.111 3,0.084 4和0.058 8t/hm2。

Soil samples at different depths were collected from island forest, Calamagrostis angustifolia meadow and Carex lasiocarpa marsh in a typical annular wetland of the Sanjiang Plain. Horizontal and verti cal distributions and DOC（dissolved organic carbon） storage in the wetland were studied and the DOC distri bution affected by the specific hydrology and landform conditions of typical annular wetland was analyzed. Results showed that the DOC content decreased with the increased soil depth. From high to low, the DOC contents in soil profiles showed the order of Carex lasiocarpa marsh, Calamagrostis angustifolia meadow and island forest, and the DOC storage, Calamagrostis angustifolia meadow, island forest and Carex lasio carpa marsh. In the 060 cm soil layers, the DOC storages were 0. 111 3, 0. 084 4 and 0. 058 8 t/hm2 , cor respondingly.