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北亚热带土地利用变化对土壤有机碳垂直分布特征及储量的影响

, PP. 744-749

Keywords: 土地利用变化,土壤有机碳,土壤有机碳储量,北亚热带地区

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Abstract:

利用野外调查的方法,研究了北亚热带地区土地利用变化对土壤有机碳的垂直分布特征及储量的影响。研究结果表明: (1)除茶园土壤外,不同林分土壤有机碳含量均以0~10 cm土层最大,随着土层深度的增加,含量总体表现为下降的趋势;茶园土壤有机碳含量在0~30 cm土层范围内增加, 30 cm以后表现下降的趋势; (2)次生林转变成农耕地以后土壤有机碳含量平均下降21. 1% ,而转变成集约经营早竹林后,土壤有机碳含量平均下降近48. 5%; 1m深度以内,土壤有机碳平均含量由高到低的顺序为:茶园、灌木林、次生林、粗放经营毛竹林、集约经营毛竹林、马尾松林、农耕地、杉木林和早竹林; (3)土壤有机碳储量随土层深度变化的趋势和土壤有机碳含量变化趋势基本一致;次生林转变成长期经营的农耕地后,土壤有机碳储量下降22. 5% ,而转变成长期集约经营早竹林后土壤有机碳储量则下降51. 4%; 9种土地利用类型中,土壤有机碳储量由高到低的顺序为:茶园、灌木林、次生林、粗放经营毛竹林、马尾松林、农耕地、集约经营毛竹林、杉木林和早竹林。

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