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应用基于干物质生产理论的过程模型(Sim-CYCLE)估算了1982—2003年间长白山阔叶红松林生态系统总第一生产力(GPP)、净第一生产力(NPP)、净生态系统生产力(NEP)及其季节动态变化以及碳储量(WE)、植物碳储量(WP)和土壤碳储量(WS),并分析了这些指标在当前气候情景和碳平衡情况时的差异及其对未来气候变化情景的响应.结果表明:在当前气候情景下,长白山阔叶红松林GPP、NPP和NEP分别为14.9、8.7和2.7Mg C·hm-2·a-1,三者分别比实测值减少2.8Mg C·hm-2·a-1、增加1.4Mg C·hm-2·a-1和增加0.2Mg C·hm-2·a-1;长白山阔叶红松林6—8月的NEP占全年总量的90%以上,其中,7月最高(1.23MgC·hm-2·month-1);研究区WE、WP和WS分别为550.8、183.8和367.0Mg C·hm-2,其与实测值均具有较高的一致性.从当前气候情景下到达碳平衡前,长白山阔叶红松林碳储量均有不同程度的增加,GPP和NPP分别为17.7和7.3Mg C·hm-2·a-1,表明研究区碳“汇”的作用随着碳储量的增加逐渐减弱;温度增加2℃时,不利于长白山阔叶红松林GPP、NPP和NEP的增长,CO2浓度倍增则可有利地促进三者的增长,CO2浓度倍增、温度增加2℃对GPP、NPP和NEP增幅的影响与单纯CO2浓度倍增的影响相似,气候变化情景对长白山阔叶红松林碳储量的影响规律与对生产力幅度的影响相同,这可能是生态系统生产力影响碳积累所致.
The total primary production (GPP), net primary productivity (NPP) and net ecosystem productivity (NEP) of broad-leaved Korean pine forests in Changbai Mountains from 1982 to 2003 were estimated by Sim-CYCLE based on dry matter production theory. And its seasonal dynamics, as well as the carbon stocks (WE), plant carbon stocks (WPs) and soil carbon stocks (WSs) were analyzed. The differences between the current climate scenarios and the carbon balances and their impacts on the future climate change scenarios The results showed that the GPP, NPP and NEP of the broad-leaved Korean pine forest in Changbai Mountain were 14.9, 8.7 and 2.7Mg C · hm-2 · a-1, respectively, in the current climate scenario, all of which were 2.8Mg C · hm-2 · a-1, increasing 1.4Mg C · hm-2 · a-1 and 0.2Mg C · hm-2 · a-1. The NEP in June-August of Changbai Mountain broad- , Which was the highest in July (1.23MgC · hm-2 · month-1). The WE, WP and WS in the study area were 550.8, 183.8 and 367.0Mg C · hm-2, respectively, Higher consistency. Before reaching the carbon balance under the current climate scenario, the carbon stocks of the broad-leaved Korean pine forest in Changbai Mountain increased to some extent with GPP and NPP of 17.7 and 7.3 Mg C · hm-2 · a-1, respectively research The role of carbon sink in the area decreased with the increase of carbon storage. When the temperature increased by 2 ℃, it was unfavorable to the growth of GPP, NPP and NEP in the broad-leaved Korean pine forest in Changbai Mountain. The effects of climate change scenarios on carbon stocks in broad-leaved Korean pine forests in Changbai Mountain are the same as those on productivity amplitudes. However, the effects of climate change scenarios on the growth of GPP, NPP and NEP are similar to those of simple CO2 concentration doublings. This may be due to ecosystem productivity affecting carbon accumulation.