TAILIEUCHUNG - Báo cáo lâm nghiệp: "Fine root distribution, seasonal pattern and production in four plantations compared with a natural forest in Subtropical China"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Fine root distribution, seasonal pattern and production in four plantations compared with a natural forest in Subtropical China. | Ann. For. Sci. 61 2004 617-627 INRA EDP Sciences 2004 DOI forest 2004062 617 Original article Fine root distribution seasonal pattern and production in four plantations compared with a natural forest in Subtropical China Yu-Sheng YANGa Guang-Shui CHENa Peng LINb Jin-Sheng XIEc Jian-Fen GUOa a Dept. of Geography Science Fujian Normal University Fuzhou 350007 China b Dept. of Life Science Xiamen University Xiamen 361005 China c Dept. of Forestry Fujian Agriculture and Forestry University Fuzhou 350002 China Received 12 May 2003 accepted 20 August 2003 Abstract - Fine root 2 mm in diameter distribution seasonal pattern and net production were studied during 1999-2001 in 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 and compared with that of an adjacent natural forest of Castanopsis kawakamii NF 150 year old in Sanming Fujian China. Fine root biomass and necromass were determined by soil coring at a bimonthly interval. Soil cores were divided into 10 depths 0 10 10 20 20 30 30 40 40 50 50 60 60 70 70 80 80 90 and 90 100 cm. Litter bags 18 X 18 cm2 size mm mesh were used in determination the decay rates of fine roots mm mm and 1-2 mm . Mean annual fine-root production mortality decomposition and turnover rate were calculated by the compartment-flow method. Mean fine-root biomass ranged from Mg ha-1 in the CF to Mg ha-1 in the NF and decreased in the following order NF CK FH OX CF. There were significant seasonal changes of biomass and necromass in all stands P while no significant yearly fluctuations were detected P . In all stands an early spring March peak of fine root biomass was found and the minimum value occurred mainly in dry summer or cold winter. For the NF of fine root biomass was found in the top soil of 0-10 cm a layer that maximum difference of depth distribution among

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