气候变暖对长白山自然保护区森林碳库的影响OA北大核心CSTPCD

Climate change will affect the structure and function of forest ecosystems,bringing uncertainty in the es-timation of forest carbon sequestration potential.To clarify the dynamics of forest carbon pools in the Changbai Mountain under climate warming,we utilized the spatially explicit landscape model LANDIS-Ⅱ to simulate the changes in forest carbon sequestration potential and carbon stock in the Changbai Mountain Nature Reserve from 2000 to 2100 under three future climate scenarios(SSP 1-2.6,SSP3-7.0,SSP5-8.5)and the current climate sce-nario(SSP0-1.0).The results showed that:(1)Net primary productivity(NPP)of forests would continue to increase in the future.By 2100,NPP under the three future climate scenarios is higher than that under the SSP0-1.0 scenario(NPP of 1010 g C·m-2·a-1).However,there are no significant spatial-temporal variations in NPP among the different climate scenarios.(2)The total carbon stock in forests shows an increasing trend under all cli-mate scenarios.Compared to the SSP0-1.0 scenario,the SSP 1-2.6 scenario leads to an increase in plant carbon pools but a decrease in soil carbon pools and detritus carbon pools,resulting in a 2.1％decrease in total carbon stock.Under the SSP3-7.0 and SSP5-8.5 scenarios,all carbon pools(plant,detritus,and soil)decrease,leading to reductions of 3.4％and 4.2％in total carbon stock,respectively.(3)The carbon pools of high-elevation forests are more sensitive to future climate warming than low-elevation and middle-elevation forests.The response of plant carbon pools to climate change shows an altitudinal gradient effect.Plant carbon pools significantly decrease at low-altitude regions and are promoted at high-altitude regions under all three future climate scenarios.This study could provide a reference for long-term forest management and the enhancement of forest carbon sequestration potential in the Changbai Mountain.