tailieunhanh - Báo cáo lâm nghiệp: " Differential effects of N, P and K on photosynthesis and partitioning of N in Pinus pinaster needles"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:" Differential effects of N, P and K on photosynthesis and partitioning of N in Pinus pinaster needles" | Ann. For. Sci. 62 2005 1-8 INRA EDP Sciences 2005 DOI forest 2004088 1 Original article Differential effects of N P and K on photosynthesis and partitioning of N in Pinus pinaster needles Charles R. WARRENa b John F. McGrathc Mark A. ADAMSa b a Department of Botany University of Western Australia Crawley WA 6009 Australia b Forest Science Centre The University of Melbourne Natural Resources and Environment Water St Creswick VIC 3363 Australia c Department of Conservation and Land Management 17 Dick Perry Avenue Kensington WA 6152 Australia Received 10 June 2003 accepted 3 October 2003 Abstract - We investigated the response of one-year-old Pinus pinaster Ait. growing on a sandy nutrient-poor soil to the factorial addition of N P and K. We tested two hypotheses 1 fertiliser application increases rates of light-saturated photosynthesis Amax and leaf-level wateruse efficiency WUE as indicated by carbon isotope composition and 2 greater concentrations of N and Rubisco explain fertiliser-promoted increases in Amax and WUE. Two years after fertiliser application the height of P. pinaster was significantly greater in plots to which P was added 127 7 cm mean SE of three replicate plots compared to those without added P 70 10 cm but was unaffected by addition of N or K. The fraction of N present as Rubisco varied between 4 and 18 and was unrelated to N concentrations but positively related to P and K concentrations. Amax and S13C did not vary significantly among treatments and were unrelated to concentrations of Rubisco N P or K. We conclude that fertiliser application two years previously has little effect on current Amax and S13C of P. pinaster and thus the previously reported effects of fertiliser on gas exchange are likely ephemeral. nitrogen phosphorus potassium photosynthesis rubisco Résumé - Effets differentiels de N P et K sur la photosynthèse et le fractionnement de N dans les aiguilles de Pinus pinaster. La réponse de plant de Pinus pinaster Ait. poussant

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