Welcome to Chinese Journal of Applied Ecology! Today is Share:

Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (12): 3827-3832.doi: 10.13287/j.1001-9332.201712.010

• Contents • Previous Articles     Next Articles

Fine root production and turnover of Pinus massoniana and their influencing factors in the Three Gorges Reservoir Area, China

WANG Na1, SHEN Ya-fei1, CHENG Rui-mei1,2*, XIAO Wen-fa1,2, YANG Shao1, GUO Yan1   

  1. 1State Forestry Administration Key Laboratory of Forest Ecolo-gy and Environment, Research Institute of Forest Ecology, Environment and Protection, ChineseAcademy of Forestry, Beijing 100091, China
    2Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
  • Received:2017-05-25 Online:2017-12-18 Published:2017-12-18
  • Contact: * E-mail: chengrm@caf.ac.cn
  • Supported by:

    This work was supported by the National Key Research and Development Program of the Ministry of Science and the Technology of China (2016YFD0600204) and Basic Science and Technology Foundation of the Ministry of Science and Technology, China (2014FY120700)

PDF (PC)

184

Abstract: In this study, the annual production and turnover rate of fine root of Pinus massoniana in Three Gorges Reservoir Area were calculated using sequential soil core,litterbag and compartment flux model methods, and the relationship between fine root production, turnover rate and factors was analyzed. The results showed that the annual mean biomass of <0.5, 0.5-1 and 1-2 mm fine root was 0.29, 0.59 and 0.76 t·hm-2, annual production was 0.13, 0.49, 0.37 t·hm-2, and annual turnover rate was 1.49, 1.01, 0.40 a-1, respectively. The effects of factors on production and turnover of fine roots with different diameters were different. Soil temperature and soil Ca content had significant effects on production and turnover of <0.5 mm fine roots, and soil temperature explained the variation of production and turnover by 32.8% and 25.0%, and soil Ca content explained by 65.6% and 73.1%, respectively. There was a positive relationship between fine root biomass and fine root production, and the biomass of fine root explained 41.0%, 41.1% and 54.5% of variation in fine root production for <0.5, 0.5-1 and 1-2 mm fine roots, respectively. P and K contents of fine roots correlated significantly with <0.5 mm fine root production, and explained 32.2% and 39.2% of the variation of <0.5 mm fine root production, respectively. The fine root with diameter <0.5 mm was most closely associated with soil factors, and soil temperature and soil Ca content were the main factors affecting fine root biomass.