Annual gross primary productivity (AGPP) of terrestrial ecosystems is the largest carbon flux component in ecosystems; however, it's unclear whether photosynthetic capacity or phenology dominates interannual variation of AGPP, and a better understanding of this could contribute to estimation of carbon sinks and their interactions with climate change. In this study, observed GPP data of 494 site-years from 39 eddy covariance sites in Northern Hemisphere were used to investigate mechanisms of interannual variation of AGPP. This study first decomposed AGPP into three seasonal dynamic attribute parameters (growing season length (CUP), maximum daily GPP (GPP), and the ratio of mean daily GPP to GPP (α)), and then decomposed AGPP into mean leaf area index (LAI) and annual photosynthetic capacity per leaf area (AGPP). Furthermore, GPP was decomposed into leaf area index of DOY (the day when GPP appeared) (LAI) and photosynthesis per leaf area of DOY (GPP). Relative contributions of parameters to AGPP and GPP were then calculated. Finally, environmental variables of DOY were extracted to analyze factors influencing interannual variation of GPP. Trends of AGPP in 39 ecosystems varied from -65.23 to 53.05 g C m yr, with the mean value of 6.32 g C m yr. Photosynthetic capacity (GPP and AGPP), not CUP or LAI, was the main factor dominating interannual variation of AGPP. GPP determined the interannual variation of GPP, and temperature, water, and radiation conditions of DOY affected the interannual variation of GPP. This study used the cascade relationship of "environmental variables-GPP-GPP-AGPP" to explain the mechanism of interannual variation of AGPP, which can provide new ideas for the AGPP estimation based on seasonal dynamic of GPP.
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| http://dx.doi.org/10.1016/j.scitotenv.2022.157856 | DOI Listing |
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