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Bulletin of Botanical Research ›› 2018, Vol. 38 ›› Issue (5): 766-774.doi: 10.7525/j.issn.1673-5102.2018.05.017

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Long-term Decline of Carbon Sink and Its Underlying Mechanisms in Tropical Montane Rainforest of Jianfengling,Hainnan Island

LI Xiang1, ZHOU Zhang1, MA Su-Hui2, XU Han1, LI Yi-De1, CHEN De-Xiang1   

  1. 1. Research Institude of Tropical Forestry, Chinese Academy of Forestry, Jianfengling Long-term Research Station for Tropical Forest Ecosystem, Guangzhou 510520;
    2. College of Urban and Environmental Sciences, Peking University, Beijing 100781
  • Received:2018-03-26 Online:2018-09-15 Published:2018-08-31
  • Supported by:
    Special key project of the basic scientific research operating expenses of Chinese academy of forestry "Study on the spatial pattern of biomass and carbon reserve in Hainan island (CAFYBB2016ZD002)";The major sub-project of national fund "Dynamic characteristics of carbon-water exchange in tropical mountain rain forest ecosystem of jianfengling(41773071)"

Abstract: Tropical forest plays a key role in the estimation of global C balance and C budget by being considered as one of the most important terrestrial ecosystem.We utilized replicated and intensive ecological measurements of forest plots from 1984 to 2013 in Jianfengling, Hainan Island to quantify the long-term carbon dynamics of tropical forests over decades, and to unravel the drivers behind these changes. Our results showed that carbon sequestration in Jianfengling tropical montane rainforest is similar to other tropical regions of the world with a net sink of 0.71±0.22 mg·C·hm-2·a-1 over the three decades. However, carbon sequestration ability in Jianfengling showed a decreasing trend, this may mainly due to high biomass mortality resulting from drought and typhoon. Although a consistent result of decreasing in carbon sequestration has been found, while high fluctuation and great variation were happened among plots, which may have a great implication that the effects of extreme events on carbon sequestration in tropical forests were possibly constrained by the condition of microsite and structure of forest itself. Therefore, more studies on carbon sequestration are required in tropics in order to reduce the uncertainties in the estimation of global carbon cycle and carbon budget.

Key words: Jianfengling, tropical montane rainforest, biomass, extreme events, carbon sequestration ability

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