南大港滩涂湿地土壤有机碳分布特征研究

Distribution Characteristics of Soil Organic Carbon in Nandagang Mudflat Wetland

滨海滩涂湿地是提高“蓝碳”碳汇、补偿碳排放的重要空间资源。为研究滨海滩涂土壤有机碳分布特征,在河北南大港滩涂湿地内设置采样地,对不同湿地类型、不同植被覆盖下土壤有机碳含量进行测定。结果表明,南大港滩涂湿地土壤有机碳含量平均值为8.03±3.39 g/kg,略低于全国平均水平。土壤有机碳空间分布有一定差异,内陆滩涂湿地土壤有机碳含量高于沿海滩涂湿地。土壤有机碳含量随土层深度增加呈下降趋势,不同深度下土壤有机碳含量差异显著。不同植物群落下土壤有机碳含量不同,表现为芦苇群落>莎草群落>碱蓬群落>金鱼藻群落>光滩地。南大港滩涂湿地土壤有机碳密度分布与土壤碳含量分布相似,土壤结构、地表植被类型对土壤有机碳含量、碳密度分布产生影响。

Coastal mudflat wetland is an important space resource to improve carbon sink and compensate carbon emission.In order to study the distribution characteristics of soil organic carbon in coastal mudflat,sampling sites were set in Nandagang mudflat wetland in Hebei Province.The content of soil organic carbon under different wetland types and different vegetation cover were collected.The results showed that the average content of soil organic carbon in Nandagang mudflat wetland was 8.03±3.39 g/kg,which was slightly lower than the national average level.There were some differences in the spatial distribution of soil organic carbon.The contents of soil organic carbon in inland mudflat wetland were higher than that in coastal mudflat wetland.The content of soil organic carbon decreased with the increase of soil depth,and the contents of soil organic carbon were significantly different at different depths.The contents of soil organic carbon were different under different plant communities,which showed that Phragmites australis community>Cyperus rotundus community>Suaeda glauca community>Ceratophyllum demersum community>pure mudflat.The distribution of soil organic carbon density in Nandagang mudflat wetland was similar to that of soil carbon content.Soil structure and surface vegetation types had an impact on soil organic carbon content and carbon density distribution.