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林业资源管理 ›› 2022, Vol. 0 ›› Issue (3): 96-103.doi: 10.13466/j.cnki.lyzygl.2022.03.015

• 科学研究 • 上一篇    下一篇

经营模式对栎类次生林土壤有机碳和氮磷的影响

欧赜瑜(), 彭珍, 王媛媛, 张溪丹, 饶冯, 谢沛霖, 万盼()   

  1. 西北农林科技大学 林学院,陕西 杨凌 712100
  • 收稿日期:2022-04-19 修回日期:2022-05-16 出版日期:2022-06-28 发布日期:2022-08-04
  • 通讯作者: 万盼
  • 作者简介:欧赜瑜(1998-),男,江苏南京人,硕士,研究方向为森林经理。Email: 1945094712@qq.com
  • 基金资助:
    国家自然科学基金(32001311);大学生创新创业训练计划项目(S202110712469);中央高校基本科研业务费专项资金资助(2452021017)

Effects of Management Methods on Soil Organic Carbon, Nitrogen and Phosphorus in Oak Secondary Forests

OU Zeyu(), PENG Zhen, WANG Yuanyuan, ZHANG Xidan, RAO Feng, XIE Peilin, WAN Pan()   

  1. College of Forestry,Northwest A&F University,Yangling,Shaanxi 712100,China
  • Received:2022-04-19 Revised:2022-05-16 Online:2022-06-28 Published:2022-08-04
  • Contact: WAN Pan

摘要:

以甘肃天水小陇山栎类次生林为研究对象,对比不同模式经营8年后0~30cm土壤有机碳(SOC)、全氮(TN)与全磷(TP)含量的差异,并分析其分布及化学计量特征,以为该区森林经营提供参考。研究以未经营为对照(UC),对比近自然森林经营(CNFM:培育目标树的间伐)、结构化森林经营(SBFM:优化空间结构的间伐)和次生林综合培育(SFCS:减少密度的间伐)3种经营模式。结果表明:1)SBFM土壤SOC,TN,TP均增加,CNFM土壤TP增加。垂直分布显示,土壤SOC和TN均富集土表且呈下降趋势;土壤TP在CNFM和SBFM中先降后升,在SFCS中下降。2)经营后土壤C:N增高,CNFM和SBFM土壤C:P,N:P显著降低;随土壤深度增加,C:P,N:P呈下降趋势,C:N保持不变。3)相关分析表明,3种模式土壤SOC变化均受N素主导,SFCS还受P素制约。可见,经营后该区森林土壤养分结构改变,土壤SOC分解减少,P素有效性增加,N素制约作用加剧。结构化森林经营在提升土壤养分,增加碳汇等方面效果好,建议该区采取此经营模式。

关键词: 栎类天然次生林, 结构化经营, 土壤有机碳, 化学计量

Abstract:

Taking oak secondary forests in Xiaolongshan,Tianshui,Gansu Province as the research subject,the differences of soil organic carbon (SOC),total nitrogen (TN) and total phosphorus (TP) contents in 0-30cm soil under different management methods were compared after 8 years of management,and their distribution and stoichiometric characteristics were analyzed to provide reference for forest management in this area.In this study,using unmanaged (UC) as a control,3 management methods of close to natural forest management (CNFM: thinning of target trees),structure-based forest management (SBFM: thinning of optimized forest spatial structure) and secondary forest comprehensive silvicuture (SFCS: thinning of reduced stand density) were compared.The results showed as follows: 1) Soil SOC,TN and TP increased in SBFM,while SOIL TP increased in CNFM.Soil SOC and TN were enriched in soil surface and showed a decreasing trend.Soil TP decreased first and then increased in CNFM and SBFM,but decreased in SFCS.2) Soil C:N increased after management,while soil C:P and N:P decreased significantly in CNFM and SBFM.With the increase of soil depth,C:P and N:P showed a decreasing trend,but the law of C:N was not obvious.3) Correlation analysis showed that N dominated SOC changes and P controlled SFCS.In conclusion,managements changed the soil nutrient structure,soil SOC decomposition slowed down,the availability of P increased,and the restriction of N intensified after management.SBMF had a good effect on improving soil nutrients and increasing carbon sink,so it was suggested to adopt this management model in this area.

Key words: natural oak secondary forest, structure-based forest management, soil organic carbon, stoichiometry

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