Tang Fengde

                                                                                  School of Environment of Liaoning University

                                                                                                        Zhang Shijjie, Han Junhui

                                                                                Institute of Applied Ecology, Chinese Academy of Sciences

Abstract: By using process model Sin CYCLE based on dry matter production theory this paper estimated the gross primary productivity(GPP),net primary productivity(NPP),net ecosystem productivity(NEP),ecosystem carbon storage (WE),total plant carbon storage (WP),and total soil carbon storage (WS)of broad-leaved Korean pine forest ecosystem in Changbai Mountains from 1982 to 2003, and analyzed the variations of these indices under present climate condition and carbon equilibrium state as well as the responses of these indices to climate change scenarios in the future. Under present climate condition, the estimated GPP,NPB and NEP were 14.9,8.7,and 2.7 MgC·hm-²·a-¹,being2.8MgC·hm-²·a-1 less and 1.4 and 0.2MgC·hm-²·a-1 higher than the measured values respectively. The NEP in June—August occupied more than 90%of the annual NEB, and the maximum monthly NEP appeared in July(1.23 Mg C·hm-²·month-¹).The estimated WE,WP and WS wee 550.8183.8,and 367.0MgC·hm-²,respectively,very close to the measured values. From present climate condition to carbon equilibrium state, the estimated carbon storage of the forest ecosystem increased to same extent with the GPP and NPP being17.7 and 7.3 MgC·hm-²·a-1, respectively suggesting that the role of the forest ecosystem as a carbon “sink” declined gradually with the increase of carbon storage A 2℃ -increment of air temperature did not benefit the increase of GPP, NPP and NEP while doubling CO₂ concentration was in adverse. The effects of the combination of doubling CO₂ concentration and 2℃-increment of air temperature on the GPP, NPR and NEP were similar to those of doubling CO₂ concentration. The climate change scenario in the future had the same effects both on the carbon storage and on the productivity of the forest ecosystem, which was mainly correlated to the effects of primary productivity on the carbon storage.

Read the full article here:       长白山阔叶红松林生态系统碳动态及其对气候变化的响应.pdf