Du You-xin, Wu Cong-jian, Zhou Sai-xia, Huang Liang, Han Shi-ming, Xu Xue-feng, Ding Yuan
Lushan Botanical Garden, Jiangxi Province & Chinese Academy of Sciences, Lushan 332900, Jiangxi, China.
Ying Yong Sheng Tai Xue Bao. 2011 Jul;22(7):1675-81.
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 x m(-2) and 6.03 - 12.89 kg x 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.
为了解中国庐山北亚热带森林土壤有机碳沿海拔梯度的空间分布特征，2010年7 - 8月分别在南坡和北坡设置了6个和5个海拔间隔200米、覆盖不同植被类型的采样地，用于采集土壤剖面，测定0 - 10厘米、10 - 20厘米、20 - 30厘米、30 - 40厘米和>40厘米土层的土壤厚度、容重、有机碳含量和有机碳密度。土壤有机碳密度受海拔和坡度的显著影响。在北坡，土壤有机碳含量随海拔升高而增加，与土壤容重和pH值呈显著负相关。在南坡，土壤有机碳含量沿海拔梯度无明显变化规律，与土壤容重和pH值的相关性较小，但土壤有机碳密度随土壤深度增加而降低。北坡和南坡的土壤有机碳密度分别在7.07 - 10.34千克·米⁻²和6.03 - 12.89千克·米⁻²范围内。南坡土壤有机碳密度沿海拔梯度和土壤深度的变化较大，表明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。
