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土壤活性有机碳在指示土壤碳库平衡、表征土壤肥力与质量、衡量土壤微生物生长等方面具有重要意义。本文对中亚热带红壤丘陵区松林生态系统93个表层(0～20cm)土壤样品的活性有机碳空间分布特征及其与地形、植被和土壤特性的关系进行了深入分析。结果表明:表层土壤活性有机碳的平均值为1.92g/kg,占土壤有机碳的29.18%,变异系数为46.15%。从不同地貌部位来看,沟道的活性有机碳含量、碳库活度均显著高于坡面。土壤活性有机碳与海拔、乔木地上生物量显著负相关,与灌木地上生物量显著正相关,与土壤有机碳、全氮、全磷、速效氮、有效磷和速效钾呈极显著正相关关系。利用Canoco进行主成分分析表明,第一、二轴可以算是主成分轴,第一轴中主要与土壤有机碳、全氮、速效氮的相关性较强,第二轴中则主要与海拔、pH、全磷、灌木地上生物量相关性较大。土壤碳库活度则与各影响因子的相关性均不显著。
Soil active organic carbon plays an important role in indicating soil carbon balance, characterizing soil fertility and quality, and measuring soil microbial growth. In this paper, the spatial distribution characteristics of active organic carbon in 93 soil samples (0 ~ 20cm) in the pine forest ecosystem in subtropical red soil hilly region and its relationship with the topography, vegetation and soil properties were analyzed. The results showed that the average value of surface soil active organic carbon was 1.92g / kg, accounting for 29.18% of the soil organic carbon, the coefficient of variation was 46.15%. According to different landforms, the active organic carbon content and carbon pool activity of the channel were significantly higher than that of the slope. Soil active organic carbon was significantly and negatively correlated with elevation and arbor aboveground biomass, significantly positively correlated with shrub aboveground biomass, and significantly positively correlated with soil organic carbon, total nitrogen, total phosphorus, available nitrogen, available phosphorus and available potassium. The principal component analysis using Canoco shows that the first and second axes can be regarded as the principal component axis. The first axis is mainly related to soil organic carbon, total nitrogen and available nitrogen, while the second axis is mainly related to altitude, pH , Total phosphorus, shrub aboveground biomass relevance. The correlation between soil carbon pool activity and various influencing factors was not significant.