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OALib Journal期刊
ISSN: 2333-9721
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三峡库区森林土壤有机碳空间分布模型的建立
DOI: 10.3969/j.issn.1000-2006.2014.06.003, PP. 11-16
Keywords: 三峡库区,森林土壤有机碳,空间分布模型
Abstract:
森林土壤有机碳(soc)深度分布模式影响其稳定性,一般下层soc较上层稳定。笔者选取三峡库区秭归县马尾松林地、退耕林地、针阔混交林地等3类森林类型的黄壤、黄棕壤、石灰土、紫色土等4类土壤类型共12种组合,通过典型地段取样法构建研究区soc密度的深度分布模型,确立模型参数与土壤性质的回归关系,确定土壤传递函数(ptfs)方程式。结果表明:森林类型仅在土壤表层影响soc密度,土壤类型对soc密度影响不显著,土壤质地对各深度层soc密度影响显著;黏土表层soc密度比砂质土高,soc密度随深度下降的速率受土壤质地和森林类型的影响,黏土soc下降速率高于砂质土;通过森林类型和土壤质地信息,构建的模型可以预测soc深度分布模式;运用构建的模型估算出三峡库区黑沟小流域30cm土层内soc储量约为(5290.32±74.85)t,0～100cm土层soc储量约为(8280.87±120.98)t,0～30cm土层soc储量约占整个剖面层的63.89%。
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