广州市典型森林土壤碳氮磷含量及化学计量特征分析

Analysis of the soil carbon,nitrogen and phosphorus content and stoichiometric characteristic of the typical forests in Guangzhou City

本文以广州市4种典型森林为研究对象,分析了不同土层土壤的有机碳(SOC)、全氮(TN)、全磷(TP)含量及其化学计量特征,试图揭示土壤营养元素的循环机制,为更好地服务于区域林地抚育提供数据支撑。结果表明:4种广州典型森林研究区域0~60 cm土层土壤的SOC、TN、TP含量范围分别在7.48~34.58 g·kg^(-1)、0.49~2.06 g·kg^(-1)、0.13~0.88g·kg^(-1)之间,除白云山外,其他3个区域土壤SOC、TP含量随土层深度增加而下降,呈“倒金字塔”的分布模式;研究区域森林土壤SOC、N、P相互之间的耦合关系显著,C:N比值主要受土壤SOC含量的影响,N:P比值主要受到土壤SOC、N含量的影响,土壤C:P比值对土壤C:N、N:P比值的影响显著。4个区域各土层C、N、P化学计量比表现为C:P>C:N>N:P。

In this paper,the organic carbon(SOC),total nitrogen(TN)and total phosphorus(TP)contents and their stoichiometric characteristics of soil in four typical forests in Guangzhou were analyzed in an attempt to reveal the cycling mechanism of soil nutrients and provide data support for better service of regional forest land tending.The results showed that,the content range of SOC,TN,and TP in the 0~60 cm soil layer of four typical forests research areas in Guangzhou ranges from 7.48 to 34.58 g·kg^(-1),0.49 to 2.06 g·kg^(-1),and 0.13 to 0.88 g·kg^(-1),respectively.Except for Baiyun Mountain,the content of SOC and TP in the other three areas decreases with the increase of soil depth,showing an inverted pyramid.The coupling relationship between SOC,TN,and TP was significant,the C∶N ratio was mainly affected by soil SOC content,the N∶P ratio was mainly affected by soil SOC and TN content,and the C∶P ratio was significantly affected by soil C∶N and N∶P ratio.The stoichiometric ratios of C,N and P in soil layers in the four regions were C∶P>C∶N>N∶P.