秦岭太白红杉林土壤有机碳密度研究

土壤有机碳(Soil Organic Carbon,SOC)库是陆地生态系统中最大的碳库,确定土壤有机碳储量及影响因子对碳循环和气候变化的研究具有重要意义.在秦岭太白山南、北坡分别沿不同海拔梯度共调查了太白红杉(Larix chinensis Beissn)林的18个样点,共计54个土壤剖面,分南、北坡对太白红杉林土壤有机碳密度进行了估算,并分析了土壤有机碳的主要影响因子.结果表明:太白红杉林北坡土壤有机碳平均密度在枯落物层为(0.31±0.18)kg/m2,在0～100 cm土层为(15.84±9.08)kg/m2;南坡土壤有机碳平均密度在枯落物层为(0.27±0.07)kg/m2,在0～100 cm土层为(14.51±7.85)kg/m2;太白红杉林南、北坡0～100 cm土层土壤有机碳平均密度为(15.18±8.51)kg/m2.秦岭太白红杉林北坡0～100 cm土层土壤有机碳密度随海拔的增加呈显著减小趋势(P0.05),此外,该层土壤有机碳密度随年降水量的增加呈下降趋势.土壤容重与w(有机碳)呈显著负相关(P0.05).

Soil Organic Carbon Density of Larix Chinensis Beissn Forest in Mt.Taibai in Qinling

Soil organic carbon (SOC) is the biggest carbon pool in terrestrial ecosystems. Determining soil organic carbon storage and impact factors is significant in research on the carbon cycle and climate change. In Larix ChinensisBeissn forest along the northern and southern slopes of Mt. Taibai in the Qinling Mountains, 54 soil profiles from 18 sample sites along different altitude grades were investigated for soil organic carbon density estimations. The main factors impacting SOC were analyzed. The results demonstrate that the average soil organic carbon density along the northern slope was (0.31±0.18) kg/m² in the litter layer, and (15.84±9.08) kg/m² at the soil depth of 0-100 cm. The average soil organic carbon density along the southern slope was (0.27±0.07) kg/m² in the litter layer, and (14.51±7.85) kg/m² at the soil depth of 0-100 cm. The average soil organic carbon density was (15.18±8.51) kg/m² at the soil depth of 0-100 cm along the northern and southern slopes in the Taibai Red Larix (Larix ChinensisBeissn) forest. Along the northern slope, the organic carbon density at the soil depth of 0-100 cm decreased with increased elevation (P<0.05) and annual precipitation increase. Soil bulk density was significantly and negatively correlated with soil organic carbon (P<0.05).