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- W3038572579 abstract "Abstract Ecosystem productivity usually exhibits first increase and then saturated response to increasing nitrogen (N) additions, yet the broad‐scale pattern and potential drivers of the N saturation threshold are little investigated. By synthesizing N addition experiments with at least four N‐input levels from the global grasslands, we applied the quadratic‐plus‐plateau model to fit the above‐ground net primary productivity (ANPP)–N rate relationship, and estimated the saturation threshold for N rate (critical N rate, N CR ) and ANPP (maximum ANPP, ANPP max ) from the inflection point where ANPP no longer statistically increased with N rate for individual experiments. Based on these estimations, we investigated the spatial pattern and driving factors of N CR and ANPP max . The mean N CR and ANPP max were 15.0 and 477.0 g m −2 year −1 , respectively, but varied substantially among single‐site experiments. Management strategies (e.g. biomass harvest, different N forms and addition frequencies) minimally influenced both parameters. Structural equation models demonstrated that the spatial differences in N CR and ANPP max were mainly explained by aridity index, and soil carbon (C)/N ratio also predicted the variation in N CR . Given that grasslands are important not only for the trend and variability of the land C sink but also for the maintenance of pasture yield, the pattern and controls of N CR and ANPP max , as revealed by the current study, are crucial for constructing robust predictions of C sink capacity and improving N fertilizer management in grasslands." @default.
- W3038572579 created "2020-07-10" @default.
- W3038572579 creator A5014814366 @default.
- W3038572579 creator A5016709396 @default.
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- W3038572579 date "2020-07-15" @default.
- W3038572579 modified "2023-10-16" @default.
- W3038572579 title "Global pattern and drivers of nitrogen saturation threshold of grassland productivity" @default.
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- W3038572579 doi "https://doi.org/10.1111/1365-2435.13622" @default.
- W3038572579 hasPublicationYear "2020" @default.
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