Convergence in the relationship of CO2 and N2O exchanges between soil and atmosphere within terrestrial ecosystems
Convergence in the relationship of CO2 and N2O exchanges between soil and atmosphere within terrestrial ecosystems
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DOI：
10.1111/j.1365-2486.2008.01595.x
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发表时间：
2008-07
影响因子：
11.6
通讯作者：
Xiaofeng Xu;H. Tian;D. Hui
中科院分区：
文献类型：
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作者：
Xiaofeng Xu;H. Tian;D. Hui
生态系统中土壤与大气之间的CO2和N2 O交换在气候变暖和全球碳氮循环中起着重要作用，但这两种温室气体的通量在生态系统尺度上是否存在相关性尚不清楚。我们收集了143对生态系统的土壤和大气之间的CO2和N2 O交换同时测量在世界各地的8个生态系统和土壤CO2和N2 O通量之间的关系。土壤CO2和N2 O通量的显着线性回归，发现所有8个生态系统，最高的斜率发生在稻田和温带草原最低。研究还发现，生长季节对年CO2和N2 O通量的关系起主导作用。土壤CO2和N2 O通量之间没有显着的关系，发现在所有8个生态系统类型。根据我们的研究结果，估计1980-2000年全球N2 O年排放量为13.31 Tg N yr−1，范围为8.19-18.43 Tg N yr−1，其中农田贡献近30%。我们的研究结果表明，化学计量关系可能会在生态系统水平上的生态功能。本文建立的土壤N2 O和CO2通量关系可用于土壤CO2和N2 O通量的生态地球化学模拟和大尺度估算。
Ecosystem CO2 and N2O exchanges between soils and the atmosphere play an important role in climate warming and global carbon and nitrogen cycling; however, it is still not clear whether the fluxes of these two greenhouse gases are correlated at the ecosystem scale. We collected 143 pairs of ecosystem CO2 and N2O exchanges between soils and the atmosphere measured simultaneously in eight ecosystems around the world and developed relationships between soil CO2 and N2O fluxes. Significant linear regressions of soil CO2 and N2O fluxes were found for all eight ecosystems; the highest slope occurred in rice paddies and the lowest in temperate grasslands. We also found the dominant role of growing season on the relationship of annual CO2 and N2O fluxes. No significant relationship between soil CO2 and N2O fluxes was found across all eight ecosystem types. The estimated annual global N2O emission based on our findings is 13.31 Tg N yr−1 with a range of 8.19–18.43 Tg N yr−1 for 1980–2000, of which cropland contributes nearly 30%. Our findings demonstrated that stoichiometric relationships may work on ecological functions at the ecosystem level. The relationship of soil N2O and CO2 fluxes developed here could be helpful in biogeochemical modeling and large‐scale estimations of soil CO2 and N2O fluxes.