广东罗浮山土壤有机碳储量与组分垂直分布特征

The Vertical Distribution Characteristics of Soil Organic Carbon Stocks and Fractions in Luofu Mountain of Guangdong

对广东罗浮山不同海拔有代表性的10个土壤采样点进行剖面挖掘,采集0~20 cm、20~40cm、40~60 cm、60~80 cm土层的土壤样品,采用化学分析方法对土壤有机碳(SOC)含量、土壤活性有机碳(POXC)含量、土壤有机碳的各组分含量及土壤基本理化指标进行分析,探讨罗浮山不同海拔各土壤剖面有机碳储量及组分的垂直分布规律。结果表明:罗浮山土壤有机碳和活性有机碳均集中分布在0~40 cm深度的土壤中,且0~20 cm SOC含量及储量与海拔呈显著正相关;随着海拔的升高,SOC含量及储量、POXC含量以及土壤有机碳各组分含量均呈增加趋势;随土层深度增加,SOC含量及储量、POXC含量、CF1和CF2含量均呈降低趋势,而CF3和CF4含量则反之;POXC含量、土壤有机碳各组分含量与SOC含量均呈极显著相关,增加SOC积累是提高SOC各组分含量的主要途径。

Dividing 10 typical soil sampling points at different elevations in Luofu Mountain,Guangdong,and collecting soil samples of 0-20 cm,20-40 cm,40-60 cm,and 60-80 cm soil layers. Chemical analysis methods were used to analyze soil organic carbon（ SOC） content,soil active organic carbon（ POXC） content,soil organic carbon content,and basic physical and chemical indicators. The vertical distribution rules of organic carbon storage and composition in different soil profiles at different altitudes in Luofu Mountain were studied. The results indicated that SOC and POXC of Luofu Mountain mainly accumulated in 0-40 cm depth,and SOC content and stock in the soil surface horizon（ 0-20 cm） significantly positively correlated with altitude. With the increase of altitude,the SOC content and stock,POXC content and the content of soil organic carbon all showed an increasing trend. With the increase of soil depth,the SOC content and stock,POXC content,CF1 and CF2 contents showed a decreasing trend,while the contents of CF3 and CF4 decreased. The content of POXC,content of organic carbon in soil and SOC content were all significantly correlated. Increasing SOC accumulation was the main way to increase the content of SOC fractionss.