Abstract
Increased nitrogen (N) deposition and land-use and land-cover change (LUCC) have influenced the terrestrial ecosystem carbon budget in China over the past few decades. However, the coupling effects of N deposition and LUCC on the carbon cycle remain unclear. This study first evaluated the effects of LUCC on N deposition based on estimated N deposition data from NO2 column remote sensing data and the GlobeLand30 LUCC dataset, and then assessed the coupling effects of N deposition and LUCC on carbon budgets in China based on a terrestrial ecosystem process-based model. The results showed that the average rate of increase in N deposition in China was 0.35 Tg N yr−1 (Tg = 1012 g), which caused net primary production (NPP) and net ecosystem production (NEP) to rise by 92.2 Tg C yr−1 and 46.9 Tg C yr−1, respectively. The effects of LUCC reduced N deposition by 0.21 Gg N yr−1 (Gg = 109 g). The land changed from forest to cropland had the greatest rate of increase in N deposition among all types of land-cover change. Changes from cropland to forest slowed the rate of N deposition increase the most. Generally, the change in N deposition resulting from LUCC reduced NPP and NEP by 0.7 and 0.4 Gg C yr-1, respectively. Compared with the total effects of N deposition on NPP and NEP, N deposition changes caused by LUCC had a limited aggregate effect on the C budget.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 41501212), the National Natural Science Foundation of China Major Program (Grant No. 41171324), Funds for Ph.D. Education (Grant No. 20110091110028), and the MOST Fundamental Research Project (Grant No. 2005DKA32306).
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Lu, X., Jiang, H., Zhang, X. et al. Relationship between nitrogen deposition and LUCC and its impact on terrestrial ecosystem carbon budgets in China. Sci. China Earth Sci. 59, 2285–2294 (2016). https://doi.org/10.1007/s11430-015-5277-0
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DOI: https://doi.org/10.1007/s11430-015-5277-0