| 林地土壤中黑碳的出现及分布特点 |
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| 引用本文： | 刘兆云,章明奎.林地土壤中黑碳的出现及分布特点[J].浙江林学院学报,2009,26(3):341-345. |
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| 作者姓名： | 刘兆云 章明奎 |
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| 作者单位： | 浙江大学,环境与资源学院,浙江省亚热带土壤与植物营养重点研究实验室,浙江,杭州,310029 |
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| 基金项目： | 国家自然科学基金，浙江大学曹光彪高科技发展基金 |
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| 摘 要： | 黑碳是生物质不完全燃烧残留于自然界的碳形态,是土壤中高度稳定的有机碳,对土壤碳库形成具有重要贡献。为了解森林土壤中黑碳的分布特点,以浙江省为例,采样分析了亚热带林地土壤中黑碳的数量、对土壤碳库的贡献及其在土壤剖面中的分布特征。结果表明,林地土壤中普遍存在黑碳,枯枝落叶层、表土层（0-10cm）和亚表层（10-20cm）黑碳质量分数分别为0.27-67.63,0.83-22.42和0.27-8.72g·kg^-1,分别占有机碳总量的0.12%-13.14%,1.87%-21.40%和3.31%-27.13%。火灾发生对林地表层土壤黑碳数量有较大的影响,近期（40a内）发生过火灾的样区枯枝落叶层和表土层黑碳质量分数明显高于近期没有发生过火灾的土壤（P〈0.05）。因此,表层土壤中黑碳数量在一定程度上可反映林地火灾发生的情况。黑碳在地表可发生侧向迁移,但垂直迁移相对较小,土壤中黑碳的积累量在山坡坡脚区域明显高于坡顶和上坡。残积母质发育的土壤中,黑碳主要集中分布在表层土壤;但坡积母质发育的土壤中,剖面中下部也有较多的黑碳积累。土壤中黑碳颗粒大小呈随剖面深度增加而减小的趋势。
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| 关 键 词： | 土壤学 林地土壤 黑碳 积累 亚热带 |
Black carbon occurrence and distribution in forest soils in Zhejiang Province, China |
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| LIU Zhao-yun,ZHANG Ming-kui.Black carbon occurrence and distribution in forest soils in Zhejiang Province, China[J].Journal of Zhejiang Forestry College,2009,26(3):341-345. |
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| Authors: | LIU Zhao-yun ZHANG Ming-kui |
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| Institution: | (Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, Zhejiang, China) |
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| Abstract: | To characterize soil black carbon storage and distribution in Zhejiang Province, China, litter, surface soil（0 - 10 cm）, and subsurface soil（10 - 20 cm） samples were collected from forest soils at 60 sites with or without wildfire histories. Results showed that mean content of black carbon in litter, surface soils and subsurface soils were 3.96, 6.91, and 3.39 g·kg^-1, in that order, accounting for 0.96%, 8.07%, and 11.82% of the soil total organic carbon, respectively. From 40 sites experiencing fire events within the last 40 years, black carbon in the litter and 0 - 10 cm soils was significantly higher than soils without a record of fire （P〈0.05）, whereas in the 10 - 20 cm soils fire events had no major impact on black carbon content （P〈0.05）. On slopes, accumulation of black carbon was generally higher on the lower part compared to the top and upper part. In soil developed from residual deposits, proportion of black carbon in total organic carbon was greater in the 0 - 10 cm layer and decreased significantly with increasing profile depth （P〈0.05）. However, in soil developed from slope deposits, high black carbon levels were noted in 30 - 80 cm, and the proportion of black carbon in total organic carbon increased significantly with increasing depths （P〈0.05）. Content of black carbon in clay fractions was higher than that of non-clay fractions, and size of soil black carbon particles became smaller with increasing depth. |
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| Keywords: | pedology forest soil black carbon accumulation subtropics |
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