中文摘要：

在湖南省长沙县大山冲国有林场的青冈一石栎常绿阔叶林样地内，用等距离布点法采集土壤和凋落物样品，分析常绿阔叶林内土壤（0—30cm）、凋落物和腐殖质层的磷素（P）含量，研究土壤全P和有效P含量的空间分布特征；对土壤全P和有效P与海拔、凹凸度、凋落物生物量、凋落物全P含量和腐殖质层全P含量等因素进行相关分析，探讨土壤全P和有效P在亚热带常绿阔叶林中的分布状况及其形成原因。结果表明，土壤（0-30cm）全P含量范围为0．200—0．402g／kg，有效P含量为2．2—6．7mg／kg。林地土壤全P含量呈条带状的梯度变化，高值区出现在海拔较低的沟谷洼地，低值出现在山脊地带；有效P含量则呈斑块状分布，无明显分布规律。林地土壤全P含量与海拔和凹凸度均具有极显著负相关（p〈0．01），而凋落物生物量、凋落物全P含量及腐殖质层全P含量对其影响不显著。土壤有效P含量受地形因子的影响较小，其与凋落物生物量具有极显著正相关（p〈0．01）、与腐殖质层全P含量具有显著正相关（p〈0．05）。

英文摘要：

Soil and litter samples were obtained at an equal distance in a one-hectare plot of a subtropical evergreen broadleaf forest （Lithocarpus glaber-Cyclobalanopsis glauca） in Dashanchong Forest Park in Changsha county, Hunan Province. Phosphorus（P） concentrations in soil, litter and thatch samples were analyzed to investigate the spatial distribution of soil total P and available P concentrations and their driving factors. The Pearson＇ s correlation analysis of total P and available P in soils with the elevation, convexity, litter biomass, and total P contents of litter and thatch was performed. The results showed that total P in soils at a depth of 0-30 cm ranged from 0.200 to 0.402 g/kg soil and available P were 2.2-6.7 mg/kg soil. Soil total P exhibited a strip distribution. The high values occurred at the low-elevation valleys, while the low values were found on the high-elevation ridges. The distribution of soil available P showed in irregular patch patterns. The total soil P had significant, negative correlations with the elevation （p 〈0.001） and convexity （p=0.009）, but did not show significant correlations with litter biomass and total P contents of litter and thatch. Soil available P, however, was less affected by terrain factors, and was mainly affected by litter biomass （r=0.263, p=0. 008） and total P content of thatch （r=0.238, p=0.017）.