TAILIEUCHUNG - Báo cáo khoa học: "The effects of climatic variability on radial growth of two varieties of sand pine (Pinus clausa) in Florida, USA"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: The effects of climatic variability on radial growth of two varieties of sand pine (Pinus clausa) in Florida, USA. | Ann. For. Sci. 58 2001 333-350 INRA EDP Sciences 2001 333 Original article The effects of climatic variability on radial growth of two varieties of sand pine Pinus clausa in Florida USA A T PorVpÁ díU 1A AT Pdt LAt a I Atliw TA Uiiiicl b f Ofizl N ĩot L N Ĩ EiillA fb Albert J. PaiKei Kathleen C. Parker Timothy D. Faust and iviatK Tvi. Fuller a Department of Geography University of Georgia Athens GA 30602-2502 USA b School of Forest Resources University of Georgia Athens GA 30602-2152 USA Received 5 September 2000 accepted 4 December 2000 Abstract - Total ring earlywood and latewood master chronologies were derived for six stands three of each of the two varieties of sand pine Pinus clausa spanning the geographic breadth of the species extant range in Florida USA. Climate growth correlations analysis of extreme growth years and multiple regression models were developed to relate growing season current and lagged monthly temperature and precipitation with interannual variability in sand pine growth increments. Four research hypotheses were evaluated 1 Sand pine growth is more sensitive to variation in precipitation than variation in temperature. 2 Sand pine growth variation is linked to El Nino-Southern Oscillation warm- vs. cold-phase events. 3 Climate growth relations are stronger for the peninsular Ocala P. c. var. clausa variety of sand pine than the panhandle Choctawhatchee P. c. var. immuginata variety. 4 Climatic signals are stronger for coastal populations vs. inland for both varieties. Precipitation especially in the winter spring season of current-year growth was more strongly linked to sand pine growth than temperature earlywood growth was significantly greater in warm-phase El Nino-Southern Oscillation years in four of the six stands and climate growth relationships were stronger in coastal populations. We found no consistent inter-varietal contrasts in the strength of climatic signals although climate growth relationships were distinctive in the two .

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