吉林蛟河针阔混交林不同林分类型土壤有机碳特征及与养分相关性研究

Soil organic carbon and its correlation with soil properties in different forest types in mixed broadleaf-conifer forest in Jiaohe of Jilin province

以吉林蛟河针阔混交红松林监测样地作为研究对象,对春榆混交林、白牛槭混交林、千金榆混交林和色木槭混交林四种林分进行林分结构调查与土壤采样,并测定土壤有机碳及养分含量,分析了不同林分类型对土壤有机碳积累的影响及土壤养分与有机碳相关性的差异。结果表明:1)该研究区四种林分土壤有机碳密度千金榆混交林(18.21kg·m-2)>春榆混交林(16.16kg·m-2)>白牛槭混交林(15.75kg·m-2)>色木槭混交林(14.23kg·m-2)。2)四种林分土壤有机碳含量及密度的变异程度规律基本遵循春榆混交林>白牛槭混交林>千金榆混交林>色木槭混交林。3)四种林分的土壤有机碳与养分的相关性规律不尽相同,全磷与千金榆、春榆混交林土壤有机碳相关性显著,速效钾只与千金榆混交林土壤有机碳具有相关性,土壤全氮和碱解氮与四种林分土壤有机碳的相关性均显著。相关分析结果说明四种林分类型土壤有机碳与土壤养分状况密切相关。

By means of setting sample plots respectively in the four forest types of Ulmus japonica mixed forest,Acer mandshuricum mixed forest,Carpinus cordata mixed forest,Acer mono mixed forest in secondary mixed broadleaf- conifer forest in Jiaohe of Jilin province,the forests stand structure were investigated and the soil samples were collected,the soil organic carbon and nutrient reserves were determined in order to analyze the differences of the correlations between soil nutrient and soil organic carbon and the accumulation of soil organic carbon＇s influencing factors. The results showed：（ 1） The organic carbon density of the forest soils in the study area is Carpinus cordata（ 18. 21kg·m- 2）〉 Ulmus japonica（ 16. 16kg·m- 2） 〉Acer mandshuricum（ 15. 75kg·m- 2） 〉Acer mono（ 14. 23kg·m- 2）.（ 2） The variation rule of the four kind of forest soil organic carbon content and density is Ulmus japonica Acer mandshuricum Carpinus cordata Acer mono mainly.（ 3） The correlations analysis between the four forests types soil organic carbon and soil properties are different. Total phosphorus is correlated with the soil organic carbon in Carpinus cordata and Ulmus japonica significantly,rapidly- available potassium only is associated with the soil organic carbon in Carpinus cordata,the correlation of soil total nitrogen and alkaline hydrolysis with the soil organic carbon in the four kinds of forests are significantly. Correlation analysis results show that the four types of forests soil organic carbon is closely related to soil nutrient.