对黄土高原子午岭油松林不同管理方式下土壤的黑碳(BC)、有机碳(POC)和活性有机碳(LOC)的空间分布和积累进行了研究.结果表明,各种管理方式的油松林其POC、LOC和BC由表层至下层均呈显著的降低规律性.各种管理方式油松林0～10cm土层以BC>POC>LOC,10～20 cm土层中,天然油松林和粗放管理型油松林BC> POC>LOC,而精细管理型油松林为POC>LOC>BC;天然油松林与粗放管理型油松林在各土层中BC在土壤有机碳总量(TOC)中所占份额无差异,而精细管理型油松林BC/TOC所占份额呈下降的规律.在油松林各种管理方式下由表层至下层POC/TOC呈下降规律,而LOC/TOC比例则呈升高规律.%Spatial distribution and the accumulation of BC , POC and LOC under different management modes of Chinese pine forest in the Ziwuling forest region of the Loess Plateau were investigated . The results indicate that there is a significant decreasing trend of BC , POC and LOC under different management modes of Chinese pine forest from its top layer to the lower layer . In the depth between 0~10 cm , there is a trend of BC>POC>LOC under all of management modes , as for the depth between 10~20 cm, there is a trend of BC>POC>LOC under natural Chinese pine forest and extensive management mode , but the trend in fine management mode presents POC>LOC>BC ; Furthermore , there is no significant difference of BC /TOC at each soil layer under both natural Chinese pine forest and extensive management modes , but the trend of BC /TOC under fine management mode presents decrease . Meanwhile , there is a decreasing trend of POC /TOC from the top layer to the lower layer under all the management modes of Chinese pine forest , but as for LOC /TOC , it presents an increasing trend .
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