莫莫格湿地土壤有机碳与络合态铁的动态变化

以莫莫格芦苇沼泽、芦苇-羊草草甸和羊草草甸3种类型湿地土壤为对象,研究了土壤总有机碳(TOC)、溶解有机碳(DOC)和络合态铁的动态变化情况.结果表明:3种类型湿地土壤TOC含量芦苇沼泽最高,羊草草旬次之,芦苇-羊草草甸最低；土壤络合态铁含量变化规律与TOC变化相同；土壤DOC含量则表现为羊草草甸最高,芦苇-羊草草甸次之,芦苇沼泽最低.随着土层深度的增加,湿地土壤TOC、DOC以及络合态铁含量都表现为自表层向深层递减的规律.相关性分析表明:从垂直动态变化看,土壤络合态铁与土壤TOC、DOC含量均有正相关关系；从季节变化看,络合态铁与TOC的季节变化呈负相关关系；芦苇沼泽和羊草草甸的土壤DOC含量与络合态铁含量季节变化趋势完全相反,二者呈显著负相关关系；芦苇-羊草草甸的DOC含量与络合态铁含量的季节变化呈显著正相关.

Changes of soil organic carbon and complex iron in Momoge Wetland

The temporal changes of soil organic carbon and complex iron content were studied in three types wetland soil of Momoge Wetlands,which include Phragmites marsh and Leymus chinensis meadow and Phragmites-Leymus chinensis meadow.The result showed that the highest content of soil total organic carbon is in Phragmites marsh,followed by Leymus chinensis meadow and the lowest is in Phragmites-Leymus chinensis meadow.The content of soil complex iron has the same variation as soil total organic carbon.However,the highest content of soil dissolved organic carbon is in Leymus chinensis meadow,followed by Phragmites-Leymus chinensis meadow and the lowest is in Phragmites marsh.With the soil depth increases,the content of soil total organic carbon,dissolved organic carbon and complex iron decreased gradually.Correlation analysis showed that in the vertical change soil total organic carbon and dissolved organic carbon were positively correlated with soil complex iron.And in the seasonal variation,soil complex iron was negatively correlated with total organic carbon;Between soil dissolved organic carbon with complex iron there were significantly negative correlations in Phragmites marsh and Leymus chinensis meadow soil,but there were significantly negative correlations in Phragmites-Leymus chinensis meadow.