TAILIEUCHUNG - Báo cáo lâm nghiệp: "Litterfall, nutrient return, and leaf-litter decomposition 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: Litterfall, nutrient return, and leaf-litter decomposition in four plantations compared with a natural forest in subtropical China. | Ann. For. Sci. 61 2004 465-476 INRA EDP Sciences 2004 DOI forest 2004040 465 Original article Litterfall nutrient return and leaf-litter decomposition in four plantations compared with a natural forest in subtropical China Yu Sheng YANGa Jian Fen GUOa c Guang Shui CHENa Jin Sheng XIEb Li Ping CAIb Peng LINc a College of Geography Science Fujian Normal University Fuzhou Fujian . China 350007 b Dept. of Forestry Fujian Agriculture and Forestry University Nanping Fujian . China 353001 c Dept. of Life Science Xiamen University Xiamen Fujian . China 361005 Received 7 March 2002 accepted 18 August 2003 Abstract - The amount and pattern of litterfall its nutrient return initial chemistry of leaf litter and dynamics of N P and K associated with leaf-litter decomposition were studied 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. Mean annual total litterfall over 3 years of observations was Mg-ha-1 in the CF Mg-ha-1 in the FH Mg-ha-1 in the OX Mg-ha-1 in the CK and Mg-ha-1 in the NF respectively of this litterfall leaf contribution ranged from 58 to 72 . Litterfall in the OX CK and NF showed an unimodal distribution pattern while for the CF and FH the litterfall pattern was multi-peak. The highest annual Ca and Mg returns were noticed in the FH and in the CK respectively. The amounts of N P and K which potentially returned to the soil were the highest in the NF. The loss of dry matter in leaf litter exhibited a negative exponential pattern during the 750-day decomposition. Using the model xt A Be-kt the annual dry matter decay constants k ranged from in CF to in OX. Initial lignin concentration and lignin N ratios showed significantly negative correlations with

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