Carbon Flux and Climate Change Response of Larix olgensis Plantation Ecosystem in Eastern Liaoning Mountainous Area

In the present study, long-term observation data of climate, soil, forest growth of Larix olgensis plantation in Bingla Mountain Forest Ecosystem Research Station were used. The parameters of the Forest-DNDC model were calibrated. The dynamic change of carbon flux and its response to climate change in L. olgensis plantation in Eastern Liaoning mountainous area were simulated by parameter calibration model. The findings indicated that the simulation results of soil respiration of L. olgensis plantation in Eastern Liaoning mountainous area by the Forest-DNDC model after parameter calibration were in good consistency with the measured values in the field (R²=0.8657). The data deviation and linear fit of the model were good, and the coefficient of variation ability of the model was r²=0.93. The average annual gross primary productivity (GPP) of the ecosystem was 13.234 t/hm². The amount of C released by autotrophic respiration was equivalent to 52.71% of the C input of ecosystem. The heterotrophic respiration accounted for 15.63% of the ecosystem C input. The net productivity (NEE) of L. olgensis plantation ecosystem in Eastern Liaoning mountainous area was 3.204 t /（hm²·a）and was equivalent to 24.21% of ecosystem C input. The NPP of L. olgensis plantation ecosystem in this region would decrease by 15.03%-29.65% under the 3 climate change scenarios. The simulation results can provide reference for the management of regional L. olgensis plantation and the formulation of climate change tackle policy.