【摘要】 为阐明地处中亚热带北部的庐山森林土壤有机碳沿海拔梯度的分布特征,2010年7—8月,分别在庐山的南、北坡按200 m的高差选择6个和5个不同海拔采样点,分层(0~10、10~20、20~30、30~40和>40 cm)采集土样,测定土壤容重、有机碳含量及有机碳密度.结果表明:海拔和坡向显著影响森林土壤有机碳密度.在北坡,随海拔升高,土壤有机碳呈逐渐增加趋势,土壤有机碳含量与土壤容重和pH值呈显著负相关关系;在南坡则没有明显规律.随土层加深,土壤有机碳逐渐下降.北坡和南坡土壤有机碳密度分别为7.07~10.34 kg.m-2和6.03~12.89 kg.m-2.南坡土壤有机碳密度随海拔梯度和土层深度变化的变异性较大,原始植被的破坏和人工林的建立可能是影响土壤有机碳空间分布的重要因素之一.更多还原

【Abstract】 To understand the spatial distribution characteristics of organic carbon in northern subtropical forest soils along an altitudinal gradient in Lushan Mountains of China,six and five sampling plots with a 200-m interval of elevation and covered by different vegetation types were installed on the southern and northern slopes,respectively in July-August in 2010 to collect soil profiles, with the soil thickness,bulk density,organic carbon content,and organic carbon density of 0-10 cm,10-20 cm,20-30 cm,30-40 cm,and >40 cm layers measured.The soil organic carbon density was significantly affected by altitude and slope.On northern slope,soil organic carbon content increased with increasing altitude,and had significant negative correlations with soil bulk density and pH value.On southern slope,soil organic carbon content had no obvious variation pattern along the altitudinal gradient and had less correlation with soil bulk density and pH value,but soil organic carbon density decreased with increasing soil depth.The soil organic carbon density on northern and southern slopes was within the range of 7.07-10.34 kg·m-2 and 6.03-12.89 kg · m-2,respectively.The larger variation of soil organic carbon density along altitudinal gradient and soil depth on southern slope suggested that the destruction of original vegetation and the establishment of forest plantation could be one of the important factors affecting the spatial distribution of soil organic carbon.更多还原