A Continental Study of Relationships Between Leaf N and P Stoichiometry and Solar Radiation Including its Direct, Diffuse, and Spectral Components,Journal of Geophysical Research: Biogeosciences

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A Continental Study of Relationships Between Leaf N and P Stoichiometry and Solar Radiation Including its Direct, Diffuse, and Spectral Components
Journal of Geophysical Research: Biogeosciences ( IF 3.7 ) Pub Date : 2020-09-10 , DOI: 10.1029/2020jg005747
Yongli Ji ₁ , Peng Zhou ₁ , Shijia Peng ₁ , Bei Huang ₁ , Shaolin Peng ₁ , Ting Zhou ₁

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Knowledge of the environmental factors affecting leaf element stoichiometry patterns can reveal nutrient fluxes of ecosystems and their responses to global change. However, understanding of continental patterns of leaf nitrogen (N) and phosphorus (P) stoichiometry in relation to solar radiation is still insufficient. We compiled available data on leaf N and P concentrations for over 1,500 species of Chinese terrestrial plants extracted from publications and acquired surface solar radiation related indexes including global radiation, direct radiation, diffuse radiation, photosynthetically active radiation (PAR) and ultraviolet‐B radiation (UVB), and other related climate indexes for 173 sites to explore the relationships between leaf N and P stoichiometry and solar radiation especially including its direct, diffuse, and spectral components for the first time at a continental scale. We found that leaf N and P concentrations were positively related to global radiation and direct radiation but negatively related to diffuse radiation. Leaf N and P concentrations were positively related to PAR but negatively related to UVB. Solar radiation had both direct associations and indirect associations mediated by temperature, precipitation, and so on with leaf N and P stoichiometry; furthermore, the direct associations, when solar radiation was indicated by spectral components, were greater than the indirect associations. So when predicting the effects of global dimming on ecosystem nutrient fluxes, we must distinguish the roles of direct, diffuse, and spectral components of solar radiation. Our study has implications for all future macroecological researches involving the effects of solar radiation on ecosystems.

更新日期：2020-09-22

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