摘要
为评估城市化背景下不同林分土壤质量和养分含量,文章以广东省樟木头林场的针阔混交林和阔叶林为研究对象,测定2种林分1 m深剖面(分0~20、20~40、40~60、60~80和80~100 cm共5个土层)土壤的物理和化学指标,评估2种林分土壤物理特性、碳氮磷及其化学计量特征,并分析影响土壤有机碳含量的因素。结果发现,(1)针阔混交林土壤的总孔隙度和非毛管孔隙度显著高于阔叶林(P<0.05),分别高4.15%~15.81%和5.22%~87.70%,且土壤容重和自然含水量也存在显著的林分差异;(2)阔叶林土壤pH值、土壤全磷、全钾和速效钾均显著高于针阔混交林(P<0.05);阔叶林0~20 cm土层土壤有机碳含量显著高于针阔混交林(69.49%,P<0.05),其他各土层土壤有机碳含量在2种林分之间差异不显著;(3)针阔混交林土壤碳磷比和氮磷比显著高于阔叶林(P<0.05),说明针阔混交林土壤磷素供应水平更低;(4)针阔混交林底层土壤(20~100 cm)有机碳与有效磷含量呈显著正相关,而阔叶林底层土壤有机碳与土壤pH值呈显著负相关,表层(0~20 cm)土壤有机碳与非毛管孔隙度呈显著正相关。因此,在未来森林经营管理中,应注意对土壤氮磷钾供应的补充,以促进森林的正向演替和提高森林的碳汇潜力。
To evaluate the soil quality and nutrient conditions of different forest stands under urbanization,this study investigated the coniferous broad-leaved mixed forest(CBMF)and broad-leaved forest(BF)in Zhangmutou Forest Farm,Guangdong Province.The physical and chemical properties of soil profile(0-20,20-40,40-60,60-80,and 80-100 cm)from the two stands were measured.The study assessed the soil physical properties,the contents of carbon,nitrogen,and phosphorus,their stoichiometric characteristics,and analyzed the influencing factors of soil organic carbon(SOC).The results showed that(1)the total porosity and non-capillary porosity of the soil in the CBMF were significantly higher than those in the BF(P<0.05),by 4.15%-15.81%and 5.22%-87.70%,respectively.The soil bulk density and natural water content also showed significant differences between the two stands.(2)The soil pH,total phosphorus,total potassium and available potassium in the BF were significantly higher than those in CBMF(P<0.05).The SOC content in the 0-20 cm soil layer of the BF was significantly higher than that of the CBMF(69.49%,P<0.05),while the SOC content in other soil layers showed no significant difference between the stands.(3)The soil C/P,N/P ratio in the CBMF were significantly higher than those in the BF(P<0.05),indicating a lower phosphorus sup-ply level in the CBMF soil.(4)In the CBMF,SOC content in the subsoil(20-100 cm)was significantly pos-itively correlated with available phosphorus.In the BF,SOC content in the subsoil was significantly negatively correlated with soil pH,while in the topsoil(0-20 cm)it was significantly positively correlated with non-capil-lary porosity.Therefore,in future forest management,attention should be paid to supplementing soil nitrogen,phosphorus and potassium supplies to promote forest succession and enhance forest carbon sink potential.
作者
柳军
熊琳娜
赵永献
蔡凤玲
莫其锋
LIU Jun;XIONG Linna;ZHAO Yongxian;CAI Fengling;MO Qifeng(Zhangmutou Forest Farm of Guangdong,Dongguan,Guangdong 523616,China;College of Forestry and Landscape Architec-ture,South China Agricultural University,Guangzhou,Guangdong 510642,China)
出处
《林业与环境科学》
2025年第5期124-130,共7页
Forestry and Environmental Science
基金
广东林业生态监测网络平台建设项目(2023KYXM09)
广东省林业科技创新项目(2022KJCX017)。
关键词
土壤有机碳
化学计量比
针阔混交林
阔叶林
土壤养分
soil organic carbon
stoichiometry
coniferous broad-leaved mixed forest
broad-leaved forest
soil nutrient
