翠亨湿地无瓣海桑人工林土壤有机碳分布特征及与土壤理化指标相关性

Soil Organic Carbon Distribution and Its Correlation with Soil Physical and Chemical Indexes of Sonneratia apetala Plantation at Cuiheng Wetland

[目的]通过对比不同潮位带无瓣海桑人工林土壤有机碳的含量和分布规律,探讨与无瓣海桑人工林土壤有机碳分布有关的主要土壤理化性质指标的相关关系。[方法]以中山翠亨国家湿地公园无瓣海桑人工林为例,选择高潮带和中潮带无瓣海桑人工林以及低潮带光滩区域,测定土壤有机碳含量及主要土壤理化指标,并计算土壤有机碳密度,再进一步分析其与土壤理化指标的相关性。[结果]研究表明:在垂直方向上,土壤有机碳平均含量和平均密度均表现出显著差异,从大到小依次为:高潮带〉中潮带〉低潮带;其中,在高潮带,土壤有机碳含量最大值出现在0~20 cm土层,有机碳密度最大值出现在20~40 cm土层。土壤有机碳含量与含盐量显著负相关,与土壤全氮、全磷极显著正相关,与土壤pH值极显著负相关。[结论]高潮带无瓣海桑人工林土壤有机碳的密度和含量均高于中潮带和低潮带;土壤全氮、全磷含量、pH值与土壤有机碳含量关系最密切,这些指标可以用来预测无瓣海桑人工林的土壤有机碳分布。

[Objective]By comparing the content and distribution rules of soil organic carbon in Sonneratia apetala plantation at different tidal levels to study the correlation between the main soil physical and chemical properties indexes and the distribution of soil organic carbon in S.apetala.[Method]Taking the S.apetala plantation in Zhongshan Cuiheng Wetland National Park as an example,the soil organic carbon content and the main soil physical and chemical index were measured,the soil organic carbon density was calculated,and its correlation with soil physical and chemical index was analyzed.[Result]The average content and density of soil organic carbon showed significant differences in the vertical direction,which was in the order of high tide zone>middle tide zone>low tide zone.In the high-water zone,the maximum value of soil organic carbon content appeared in the 0-20 cm soil layer,and the maximum value of organic carbon density appeared in the 20-40 cm soil layer.Soil organic carbon content was significantly negatively correlated with soil salt content,extremely positively correlated with the total nitrogen and total phosphorus,and extremely positively correlated with soil pH value.[Conclusion]The density and content of soil organic carbon in S.apetala plantation in high tide zone are higher than those in middle tide zone and low tide zone.The soil total nitrogen,total phosphorus and pH value are significantly related to soil organic carbon content,so they can be used to judge the distribution of soil organic carbon in S.apetala plantation.