TAILIEUCHUNG - Báo cáo lâm nghiệp: "Nutrient dynamics in decomposing needles of Pinus luchuensis after typhoon disturbance in a subtropical environment"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Nutrient dynamics in decomposing needles of Pinus luchuensis after typhoon disturbance in a subtropical environment. | Ann. For. Sci. 63 2006 707-713 INRA EDP Sciences 2006 DOI forest 2006051 707 Original article Nutrient dynamics in decomposing needles of Pinus luchuensis after typhoon disturbance in a subtropical environment Xiaoniu Xua b a Department of Forest Science College of Forestry and Landscape Architecture Anhui Agricultural University Hefei Anhui 230036 PR China b Field Science Center for Northern Biosphere Hokkaido University Nayoro Hokkaido 096-0071 Japan Received 24 July 2005 accepted 17 January 2006 Abstract - Decomposition of typhoon-generated and normally fallen needles and their dynamical patterns of nutrient release for ten elements C N P K Ca Mg S Fe Al and Mn were investigated over 3 yr using the litterbag technique in a subtropical pine plantation Pinus luchuensis Mayr. in Okinawa southwestern Japan. After 3 yr decomposition rates k values were and yr-1 respectively for typhoon-generated and normally fallen needles. The typhoon-generated needles decomposed significantly more rapidly than the normally fallen needles did which was due to the higher N and P concentrations. Nutrient transfer patterns for elements varied greatly. However significant differences in mass dynamic patterns of elements between typhoon-generated and normally fallen needles were found only in N and P P . Nutrient mobilities during the decomposition processes were similar in both typhoon-generated and normally fallen needles and was ordered as follows K Ca Mg C S N Mn P Fe Al. Rapid decomposition with rapid release of P and N in typhoon-generated needles indicates that typhoon disturbances can drive P and N cycling at a somewhat higher rates which is more important from the standpoint of forest productivity since P and N are limiting nutrients in the subtropical forests in Okinawa. litter chemical quality needle decomposition nutrient release pine plantation Pinus luchuensis typhoon impact Résumé - Dynamiques des nutriments dans les aiguilles en decomposition de

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