Impacts of solar radiation on net ecosystem carbon exchange in a mixed plantation in the Xiaolangdi Area

Abstract

Light quantity and quality strongly influence plant growth. Solar radiation is one of the main environmental factors driving vegetation carbon assimilation. As one of the natural climatic variables, clouds change the fraction of diffuse radiation arriving on the land surface and can influence carbon dioxide exchange between vegetation and the atmosphere. In this study, CO 2 flux was continuously measured during the vegetative growing season (June鄄August) from 2006 to 2008 by the eddy covariance systems in a mixed plantation in the Xiaolangdi area, Henan province. The clearness index (k t) was used to describe the effects of cloudiness on solar radiation. Clear mornings and afternoons were identified based on the change of k t with solar elevation (茁) at a half鄄day scale. The impacts of cloudiness on the net ecosystem exchange of carbon dioxide (NEE) were investigated to reveal the mechanism of changes in coordinate of solar radiation and other

Growing-season carbon budget of alpine meadow ecosystem in the Qinghai Lake Basin: a continued carbon sink through this century according to the Biome-BGC model

“…Radiation enhancement has stronger transmission in the canopy, coupled with the reduction in VPD, which induces the opening of vegetation stomata. Thus, this process promotes photosynthesis in vegetation [ 57 , 58 ].…”