| 摘要: |
| 【目的】明确辽河源自然保护区不同林龄山杨天然次生林（Populus davidiana）0～100 cm土层的土壤有机碳密度及其垂直分配特征，为评价其碳汇功能提供依据。【方法】 以河北辽河源自然保护区山杨中龄林、近熟林、成熟林为研究对象，采集了27个土壤剖面（0～100 cm土层）的土壤样品，对土壤体积质量、土壤有机碳含量进行测定，计算土壤有机碳密度，并对土壤有机碳含量与其他土壤理化指标的关系进行分析。【结果】辽河源自然保护区不同林龄山杨天然次生林土壤的体积质量为1.07～1.69 g/cm3，且随着土层深度的增加呈逐渐增加趋势。不同林龄山杨天然次生林的土壤有机碳含量均随着土层深度的增加而降低，中龄林、近熟林和成熟林3种林龄山杨林土壤有机碳含量为1.53～17.59 g/kg。0～100 cm土层土壤有机碳密度平均值为15.31 t/hm2，相同林龄不同土层土壤有机碳密度平均值随着土层深度的增加呈先降低后增加再降低的变化趋势。相关性分析表明，3种林龄整个土壤剖面土壤有机碳含量与土壤全N、全P含量均呈极显著正相关，与土壤pH呈正相关；中龄林、近熟林土壤有机碳含量与土壤体积质量、土壤全K含量均呈极显著负相关，与土壤含水量呈极显著正相关；成熟林土壤有机碳含量与土壤体积质量、土壤全K含量存在负相关关系，而与土壤含水量存在一定的正相关关系。【结论】辽河源自然保护区不同林龄山杨天然次生林0~10 cm土层土壤有机碳密度从大到小依次为近熟林＞中龄林＞成熟林，10～20 cm土层为近熟林＞成熟林＞中龄林， 20～100 cm土层则表现为成熟林＞中龄林＞近熟林。 |
| 关键词: 辽河源自然保护区 山杨天然次生林 林龄 土壤体积质量 土壤有机碳含量 土壤有机碳密度 |
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| 基金项目:林业公益性行业科研专项“森林生态服务功能分布式定位观测与模型模拟”(201204101) |
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| Characteristics of soil organic carbon in Populus davidiana natural secondary forest stands at different ages in Liaoheyuan Nature Reserve |
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ZHAO Wei-hong,KANG Feng-feng,HAN Hai-rong,et al
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| Abstract: |
| 【Objective】This study researched the soil organic carbon density and vertical distribution at depth of 0-100 cm in Populus davidiana natural secondary forests at 3 different ages in Liaoheyuan Nature Reserve to provide reference for evaluating forest carbon sequestration.【Method】Soil samples were collected from 27 profiles (at depth of 0-100 cm) of P.davidiana natural secondary forest plantations at different ages in Liaoheyuan Nature Reserve and the soil bulk density,soil organic,and carbon soil carbon density were measured.Correlation analysis were also conducted between soil organic carbon and other soil physical and chemical indexes.【Result】The soil bulk density in layer of 0-100 cm were 1.07-1.69 g/cm3 and gradually increased with the increase of soil depth.The soil organic carbon contents in P.davidiana natural secondary forests at different ages were 1.53-17.59 g/kg and decreased with the increase of soil depth.The average soil organic carbon density in layer of 0-100 cm was 15.31 t/hm2,soil organic carbon densities in different soil types at same tree age increased first and then decreased gradually along with depth.Correlation analysis showed that the soil organic carbon in forests at 3 different ages in the profiles had extremely positive correlation with soil total N and soil total P and positive correlation with soil pH.The soil organic carbon of middle-aged forest and nearly mature forest had extremely negative correlation with soil bulk density and soil total K but extremely positive correlation with soil moisture.The soil organic carbon of mature forest had negative correlation with soil bulk density and total K but positive correlation with soil moisture.【Conclusion】The soil organic carbon densities in depth of 0-10 cm in P.davidiana natural secondary forests at different ages were in the decreasing order of mature forest＞middle-aged forest＞mature forest,in the depth of 10-20 cm the order was mature forest＞mature forest＞middle-aged forest,and in depth of 20-100 cm the order was mature forest＞middle aged forest＞nearly mature forest. |
| Key words: Liaoheyuan Natural Reserve Populus davidiana natural secondary forest forest age soil bulk density soil organic carbon content soil organic carbon density |
