Radial growth responses of four coniferous species to climate change in the Potatso National Park, China

doi:10.13287/j.1001-9332.202110.033

Abstract

Abstract: Using the principles and methods of dendrochronology, we measured tree-ring width of four dominant coniferous species, i.e., Larix potaninii var. macrocarpa, Picea brachytyla, Pinus densata, and Abies georgei, in the Potatso National Park, and established the tree-ring width resi-dual chronologies. We analyzed the correlation of tree-ring width residual chronologies with daily and monthly climate data from the Shangrila meteorological station to analyze the response of radial growth to climate factors. The results showed that L. potaninii var. macrocarpa had the highest annual growth rate, and A. georgei had the lowest. Radial growth showed species-specific responses to climate changes, with the highest sensitivity of L. potaninii var. macrocarpa and the lowest sensitivity of P. brachytyla. Ring-width chronology of A. georgei correlated positively with mean temperature during previous winter (November and December) and current summer (July). Ring-width chronology of L. potaninii var. macrocarpa correlated positively with temperature during the early-growing season (June), but negatively with precipitation and relative humidity. Ring-width chronology of P. densata correlated positively with precipitation and humidity but negatively with maximum temperature during the early-growing season (May), indicating that its radial growth was primarily influenced by water availability during the early-growing season.

Key words: conifer, radial growth, tree-ring width, climate response

ZHANG Ju-mei, FAN Ze-xin, FU Pei-li, SHANKAR Panthi, TANG Hua. Radial growth responses of four coniferous species to climate change in the Potatso National Park, China[J]. Chinese Journal of Applied Ecology, 2021, 32(10): 3548-3556.

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