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Báo cáo lâm nghiệp: "Conversion of a natural broad-leafed evergreen forest into pure plantation forests in a subtropical area: Effects on carbon storage"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: "Conversion of a natural broad-leafed evergreen forest into pure plantation forests in a subtropical area: Effects on carbon storage" | 659 Ann. For. Sci. 62 2005 659-668 INRA EDP Sciences 2005 DOI 10.1051 forest 2005073 Original article Conversion of a natural broad-leafed evergreen forest into pure plantation forests in a subtropical area Effects on carbon storage Guang-Shui CHENa Yu-Sheng YANGa Jin-Sheng XiEb Jian-Fen GUOa Ren GAOa Wei QiANa a Department of Geography Sciences Fujian Normal University Fuzhou 350007 China b Department of Forestry Fujian Agriculture and Forestry University Fuzhou 350002 China Received 14 February 2005 accepted 27 June 2005 Abstract - For the last several decades native broad-leafed forests in many areas of south China have been converted into plantations of more productive forest species for timber use. This paper presents a case study examining how this forest conversion affects ecosystem carbon storage by comparing 33 year-old plantations of two coniferous trees Chinese fir Cunninghamia lanceolata CF and Fokienia hodginsii FH and two broadleaved trees Ormosia xylocarpa OX and Castanopsis kawakamii CK with an adjacent relict natural forest of Castanopsis kawakamii NF 150 year old in Sanming Fujian China. Overall estimates of total ecosystem carbon pools ranged from a maximum of 399.1 Mg ha-1 in the NF to a minimum of 210.6 Mg ha-1 in the FH. The combined tree carbon pool was at a maximum in the NF where it contributed 64 of the total ecosystem pool while the OX had the lowest contribution by trees at only 49 . Differences were also observed for the carbon pools of undergrowth forest floor and standing dead wood but that these pools together represent at the most 5 of the ecosystem C stock. Total C storage in the surface 100 cm soils ranged from 123.9 Mg ha-1 in the NF to 102.3 Mg ha-1 in the FH. Significant differences P 0.01 in SOC concentrations and storage between native forest and the plantations were limited to the surface soils 0-10 cm and 10-20 cm while no significant difference was found among the plantations at any soil depth P 0.05 . Annual aboveground .