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FOREST RESOURCES WANAGEMENT ›› 2020›› Issue (6): 96-104.doi: 10.13466/j.cnki.lyzygl.2020.06.016

• Scientific Research • Previous Articles     Next Articles

Effects of thinning on growth and soil organic carbon of Cryptomeria fortunei Plantation in Western Sichuan

GONG Yingyun(), WANG Ruihui(), ZHANG Bin, LIU Kaili, DONG Kaili, LIU Juntao, ZHAO Suya, ZHOU Yuhuai   

  1. College of Forestry,Central South University of Forestry and Technology,Changsha,Hunan 410004,China
  • Received:2020-09-11 Revised:2020-09-29 Online:2020-12-28 Published:2021-01-26
  • Contact: WANG Ruihui E-mail:Ivy_623598581@qq.com;wang626389@163.com

Abstract:

This paper takes the 9-year-old Cryptomeria fortunei Plantation in Ya'an of Sichuan Province as the research object and sets up four kinds of thinning intensities,including control (CK,0%),light (T1,21.1%),medium (T2,36.9%) and heavy (T3,49.0%) thinning,with the aim to study the effects of thinning on tree growth and soil organic carbon.The results show that the average annual growth of DBH,height and volume of stands were thinned plot>CK after 4 years of thinning,and there was significant difference between both (P<0.05).The annual average growth of DBH was T3>T2>T1>CK,and there was significant difference between all treatments (P<0.05),but there was no significant difference between the annual average growth of height and volume of thinning sample plot (P>0.05).The number of trees in the DBH class tends to the higher DBH class concentration in T2 and T3 treatments.The mean values of soil organic carbon (SOC) content and carbon density T2 and T3 in 0-40 cm soil layer are significantly higher than CK (P<0.05).Thinning significantly reduces the soil bulk density and improves capillary water holding capacity.T2 and T3 are significantly different from CK at the mean value of soil total N (P<0.05).After thinning,the SOC content and density (0-20 cm) are significantly correlated to total N and P nutrient content of soil (P<0.01).The results show that medium thinning intensity (T2) could obtain greater ecological and economic benefits.

Key words: Cryptomeria fortunei, tending thinning, tree growth, soil organic carbon, physicochemical property

CLC Number: