不同林龄油松人工林土壤碳、氮和磷生态化学计量特征  

Ecological stoichiometry characterization of soil carbon,nitrogen,and phosphorus of Pinus tabuliformis plantations at different stand ages

作　　者：杨霞 陈丽华[1] 郑学良[1] YANG Xia;CHEN Lihua;ZHENG Xueliang(School of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China)

机构地区：[1]北京林业大学水土保持学院,北京100083

出　　处：《中国水土保持科学》2021年第2期108-116,共9页Science of Soil and Water Conservation

基　　金：国家重点研发计划项目“黄土残塬沟壑区水土保持型景观优化与特色林产业技术及示范”(2016YFC0501704)。

摘　　要：探究林龄对油松人工林土壤有机碳、全氮和全磷质量分数及其生态化学计量特征的影响,以期指导林木生长环境调节,为林地土壤肥力管理提供参考。2018年6月在辽宁省抚顺县温道林场选取3个不同林龄油松人工林(42、65和85年)作为研究对象,分别测定0~20、>20~40和>40~60 cm层土壤有机碳、全氮和全磷质量分数。结果表明:1)3个林龄0~60 cm层土壤有机碳、全氮和全磷质量分数分别为15.73~47.67、0.40~1.58和1.11~2.27 g/kg,林龄和土层深度对其均有极显著影响(P<0.01),土壤有机碳和全氮质量分数随林龄先增加后减少,随土层加深逐渐较少。2)3个林龄0~60 cm层土壤碳∶氮、碳∶磷和氮∶磷分别为36.19~42.43、10.40~39.44和0.26~1.33,林龄和土层深度对土壤碳∶磷和氮∶磷存在极显著影响(P<0.01),对土壤碳∶氮则无明显影响(P>0.05)。3)土壤碳∶氮与土壤全氮显著相关,与土壤有机碳相关性不明显;碳∶磷与有机碳和全磷均显著相关;氮∶磷与全氮和磷显著相关。综上,研究中油松林土壤有机碳和全氮质量分数随林龄增加,林龄达到一定阶段后开始减少,并且土壤氮素矿化能力较弱,土壤氮素贫瘠,在以后的经营中应该对土壤养分状况进行适当的调整。[Background]This work is to investigate the effects of concentrations and stoichiometric of soil organic C(carbon),total N(nitrogen)and total P(phosphorus)in Pinus tabuliformis plantation at different age stages,and to provide theoretical guidance for the regulation of the growth environment of forests and a reference for the management of soil fertility in forests.[Methods]In June 2018,a survey was conducted in Wendao Forest Farm,Fushun county,Liaoning province,and Pinus tabulaeformis plantations of different forest ages(42,65,and 85 years)were selected as the research objects.Three plots with a total area of 20 m×20 m(9 plots in total)were set up respectively,and took three soil sample collection points(27 sampling points in total)according to the upper,middle and lower routes.The sampling points were more than 5 m from the boundary.Sampling was conducted according to soil depth of 0-20,>20-40,>40-60 cm at the sampling point.Soil organic C was determined by potassium dichromate oxidation-heating method,soil total N was determined by potassium dichromate sulfuric acid digestion method,the determination of soil total P was determined using a Mo-Sb molten NaOH anti colorimetry.[Results]1)The contents of soil organic C,total N and total P in 0-60 cm soil layer of P.tabuliformis plantation were 15.73-47.67,0.40-1.58 and 1.11-2.27 g/kg,which were statistically affected by different stand age and soil depth(P<0.01).Soil organic C and total N increased at initial and then decreased with stand age,and decreased with increasing of soil depth.2)The C∶N,C∶P and N∶P in 0-60 cm soil layer of P.tabuliformis plantation were 36.19-42.43,10.40-39.44 and 0.26-1.33.The stand age and the soil depth presented an extremely significant influence on soil C∶P and N∶P(P<0.01),but no significant influence on soil C∶N(P>0.05).3)There was significant correlation between soil C∶N and soil total N,and there was no correlation with soil organic C.Soil C∶P was significantly correlated with soil organic C and total P.N∶P was s

关 键 词：林龄 油松人工林 碳氮磷 生态化学计量 辽东低山区 

分 类 号：S758.53[农业科学—森林经理学]