中亚热带4种森林类型土壤碳密度和碳贮量研究

研究了地处中亚热带的都江堰灵岩山的4种森林类型土壤的有机碳(SOC)密度、碳贮量及其相关规律。结果表明:4种森林类型及不同土层SOC含量和SOC密度均差异显著。随土层深度增加,SOC含量和密度逐渐减小。柳杉林、银杏林、杉木 喜树混交林和楠木林土壤的SOC含量分别为12.26、12.40、11.88和9.33 g.kg-1,SOC密度分别为15.59、15.20、15.03和8.11 kg.m-2。4种林地碳贮存较高,平均碳贮量134.83 t.hm-2,说明灵岩山土壤有机碳累积丰富,而不同林分差异较大。SOC含量与全N含量呈极显著相关,线性回归拟合较好,说明土壤中碳素的贮存与氮素密切相关。

Soil Organic Carbon Density and Storage in Different Forest Types in Mid-subtropical Zone

Soil organic carbon(SOC)density and carbon storage and related regulations of 4 forest types were studied in Lingyan Mountain of Sichuan province situated in mid-subtropical zone.The result showed that there were signifi-cant differences among SOC content and density from the 4 forest types and different soil layers.The vertical distribu-tion varied with soil depth.SOC content and density in Cryptomeria fortunei,Ginkgo biloba,Cunninghamia lanceolata Camptotheca acuminata mixed forest and Phoebe zhennan forest were 12.26g/kg and 15.59kg/m2,12.40g/kg and 15.20kg/m2,11.88g/kg and 15.03 kg/m2,9.33g/kg and 8.11kg/m2.The carbon storage of the 4 forestlands was huge,average 134.83t/hm2.The result indicated that SOC in Lingyan Mountain was abundant but had significant difference among stands.SOC content had evident close relation with total nitrogen,and the linear regression was well fitting,means that soil carbon storage had close relation with nitrogen.