黄土高原沟壑区刺槐、油松人工林的碳储量及其分布特征研究

Studies on the Carbon Storage and Distributive Character of Robinia and Pinus in Loess Plateau Gully Area

以黄土高原中部黄陵地区油松,刺槐两种人工林为研究对象,采用现地调查,采样分析等方法对这两种人工林的碳储量和根系、土壤有机碳垂直分布进行对比研究,结果表明在相同树龄和不同植被下,根系生物量存在差异,尤其是根粗细度在5mm以上的根系差异性显著(p =0.01),变异系数达到了48%;土壤有机碳含量也存在差异,变异系数为27%;根系生物量和土壤有机碳含量垂直分布特征明显,根系生物量层次变化大,主要集中在第二、三层;土壤有机碳含量层次变化平缓,表层含量最大;在两种人工林土壤全氮、全磷与土壤有机碳相关性研究中,只发现全氮与有机碳含量之间都呈显著线性正相关。

Vertical distributions of soil carbon storage, root system, and soil organic carbon were studied by field survey and sampling analysis in Pinus and Robinia plantations located in gully areas of Loess Plateaus. The results showed that there existed differences in root biomass between plantations with different tree species but same tree age. Especially, there were significant differences in root biomass, in which the root diametres were 5ram over, with a coefficient of variation（cv） 48% （p = 0.01 ）. Differences also existed in the content of soil organic carbon, cv =27%. Vertical distribution characteristics were distinct in root biomass and soil organic carbon. There were great change of root biomass in different layers, concentrated mainly in the second and the third layers. Change of soil organic carbon were relatively smooth, and concentrated mainly in the surface layer. Correlation analysis between soil total nitrogen, phosphorus and organic carbon showed that the total nitrogen significantly correlated to organic carbon linearly.