黄土高原子午岭油松林管理方式对黑碳和颗粒有机碳积累的影响

Effects of management mode of Chinese pine forest on accumulation of black carbon and particulate organic carbon in the Ziwuling forest region of the Loess Plateau

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0~10 cm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 BCPOCLOC under all of management modes,as for the depth between 10-20 cm,there is a trend of BCPOCLOC under natural Chinese pine forest and extensive management mode,but the trend in fine management mode presents POCLOCBC;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.