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FOREST RESOURCES WANAGEMENT ›› 2022›› Issue (3): 96-103.doi: 10.13466/j.cnki.lyzygl.2022.03.015

• Scientific Research • Previous Articles     Next Articles

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 E-mail:1945094712@qq.com;wp7413841@163.com

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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