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太阳辐射是陆地生态系统碳水循环的能量来源。太阳辐射的变化对植被吸收大气CO2具有重要影响。该文通过辐射观测数据建立散射辐射比例与晴空指数的关系,结合生态过程模型(BEPS)和通量观测数据,模拟分析了太阳辐射变化对千烟洲常绿针叶林总初级生产力(GPP)的影响。研究结果表明:千烟洲森林生态系统的阴叶对年GPP总量的贡献达67%,太阳辐射变化对阴叶光合作用的影响决定了冠层GPP的变化;太阳辐射强度和分布的年际差异导致年GPP对太阳辐射变化的响应不同,2003、2004和2005年太阳辐射分别变化–5.44%、–1.83%和6.26%,可使千烟洲生态系统当年GPP总量达到最大值;在季节上,太阳辐射的增加会导致5–6月GPP上升,7–9月GPP下降,使年GPP变化程度降低;在天尺度上,晴空指数在0.43时,太阳辐射变化对GPP的影响最小。
Solar radiation is the source of energy for the carbon cycle in terrestrial ecosystems. Changes in solar radiation on vegetation to absorb atmospheric CO2 has an important impact. In this paper, the relationship between the proportion of scattered radiation and the index of clear sky was established by using radiation observation data. The effects of solar radiation on the total primary productivity (GPP) of evergreen coniferous forest in Qianyanzhou were simulated and analyzed with the combination of ecological process model (BEPS) and flux observation data. Impact. The results showed that the shade leaves of Qianyanzhou forest ecosystem contributed 67% of the total annual GPP. The effect of solar radiation on the photosynthesis of globule leaf determined the change of canopy GPP. The intensity of the solar radiation and the distribution of annual Differences lead to different annual GPP response to changes in solar radiation, solar radiation changes in 2003, 2004 and 2005 were -5.44%, -1.83% and 6.26%, can make Qianyanzhou ecosystem GPP total year to reach the maximum; in the season , The increase of solar radiation will lead to the increase of GPP in May-June and the decrease of GPP in July-September, and the change of annual GPP will decrease. On the day scale, when the clear sky index is 0.43, the change of solar radiation has the least effect on GPP.