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林业资源管理 ›› 2023›› Issue (1): 71-79.doi: 10.13466/j.cnki.lyzygl.2023.01.009

• 科学研究 • 上一篇    下一篇

不同林龄华山松人工林土壤养分及其生态化学计量特征

何斌1,2(), 李青1,2, 李望军1,2, 邹顺1,2, 白晓龙1,2, 冯图1,2   

  1. 1.贵州省典型高原湿地生态保护与修复重点实验室,贵州 毕节 551700
    2.贵州工程应用技术学院 生态工程学院,贵州 毕节 551700
  • 收稿日期:2022-12-04 修回日期:2023-02-15 出版日期:2023-02-28 发布日期:2023-05-05
  • 作者简介:何斌(1980-),男,山西朔州人,教授,博士,主要研究方向为森林生态学和植物生理生态学。Email:hebin23kewen@163.com
  • 基金资助:
    贵州省科技计划项目(黔科合基础-ZK〔2021〕一般231);贵州省教育厅青年人才成长项目(黔教合KY字〔2022〕120和123号);毕节市科学技术项目(毕科合重大专项字〔2021〕1号)

Soil Nutrient and C:N:P Stoichiometry of Different Aged Pinus armandii Plantations

HE Bin1,2(), LI Qing1,2, LI Wangjun1,2, ZOU Shun1,2, BAI Xiaolong1,2, FENG Tu1,2   

  1. 1. Guizhou Provincial Key Laboratory of Ecological Protection and Restoration of Typical Plateau Wetlands
    2. College of Ecological Engineering,Guizhou University of Engineering Science,Bijie,Guizhou 551700,China
  • Received:2022-12-04 Revised:2023-02-15 Online:2023-02-28 Published:2023-05-05

摘要:

为了阐明林龄对华山松人工林土壤养分以及碳(C)、氮(N)、磷(P)生态化学计量特征的影响,在贵州省毕节市境内的乌蒙山选取4个林龄(10,16,22,47a)的华山松人工林为研究对象,在每个林分内选择具有代表性的地段分别设置3块20 m×20 m样地,每块样地内按“S”形设置5个采样点,测定0~20 cm土层土壤的pH、总碳(TC)、全氮(TN)、全磷(TP)、全钾(TP)、全钙(TCa)、有机碳(SOC)、速效氮(AN)、速效磷(AP)、速效钾(AK),并计算土壤C:N:P化学计量比,分析它们随林龄的变化及其与C:N:P化学计量比之间的关系。结果表明:1)不同林龄华山松人工林土壤SOC含量23.624~65.093g/kg,TN含量1.533~5.157g/kg,远高于全国土壤的平均水平;TP含量0.327~1.097g/kg,与全国土壤平均水平相当,说明研究区内土壤C,N含量较高;2)林龄对华山松人工林土壤养分和C:N:P生态化学计量比均有显著影响;随着林龄增长,华山松人工林土壤TC,SOC含量,C:N和C:P先降低后增加,TN,TP,AN,AP和AK含量逐渐增加,土壤pH,TK和TCa含量先增加后降低,N:P呈波浪形变化趋势;3)土壤C:N,C:P与TK,TCa的相关性大于与TN,TP的相关性,说明华山松人工林土壤C:N和C:P主要受钾和钙的影响。因此,在华山松人工林经营管理过程中,如何科学调控土壤中钾(K)和钙(Ca)含量显得尤为重要。研究结果可以为华山松人工林的可持续经营和科学管理提供理论依据。

关键词: 华山松人工林, 林龄, 土壤养分, 生态化学计量学

Abstract:

In order to elucidate the effects of stand age on soil nutrients and C:N:P stoichiometry characteristics in Pinus armandii plantations,an age sequence of Pinus armandii stands (10 years old,16 years old,22 years old and 47 years old) were selected in Wumeng Mountain,Bijie City,Guizhou Province.Three representative 20 m×20 m plots were set in each forest stand.The soil pH,total carbon (TC),total nitrogen (TN),total phosphorus (TP),total potassium (TP),total calcium (TCa),soil organic carbon (SOC),available nitrogen (AN),available phosphorus (AP),and available potassium (AK) at soil depth of 0-20 cm were measured,and the stoichiometric ratio of soil C:N:P was calculated.Their changes with stand age and their relationship between the C:N:P stoichiometric ratio and the factors were explored.The results showed that the concentrations of SOC and TN among different ages ranged 23.624~65.093 g/kg and 1.533~5.157 g/kg,respectively,which were much higher than the national average level.The concentrations of TP ranged 0.327~1.097 g/kg,which was comparable to the national average soil level.These indicated that the concentrations of SOC and TN were high in the study area.The stand age had significant effects on soil nutrients and C:N:P stoichiometric ratio.With the increase of stand age,the soil TC,SOC,C:N and C:P showed a trend of first decreasing and then increasing,whereas soil pH,TK and TCa showed a trend of first decreasing and then increasing.The TN,TP,AN,AP and AK increased gradually with the increasing of stand age,whereas the soil N:P showed a wavy trend.Pearson correlation analysis showed that the correlations of soil C:N and C:P with TK and TCa were greater than those with TN and TP,indicating that the soil C:N ratio and C:P ratio of Pinus armandii plantations were mainly affected by the contents of potassium and calcium.Therefore,it is particularly important to scientifically regulate the contents of potassium and calcium in the soil during the management of Pinus armandii plantations.Results from this study can provide theoretical basis for sustainable and scientific management of Pinus armandii plantations.

Key words: Pinus armandii plantations, stand age, soil nutrient, ecological stoichiometry

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