Long-term increases in soil carbon due to ecosystem fertilization by atmospheric nitrogen deposition demonstrated by regional-scale modelling and observations.
Long-term increases in soil carbon due to ecosystem fertilization by atmospheric nitrogen deposition demonstrated by regional-scale modelling and observations.
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DOI：
10.1038/s41598-017-02002-w
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发表时间：
2017-05-15
影响因子：
4.6
通讯作者：
Tomlinson SJ
中科院分区：
文献类型：
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作者：
Tipping E;Davies JAC;Henrys PA;Kirk GJD;Lilly A;Dragosits U;Carnell EJ;Dore AJ;Sutton MA;Tomlinson SJ
通过人为大气氮沉降（Ndep）对氮（N）有限的生态系统施肥可能会促进大气中二氧化碳的去除，从而缓冲人类对全球辐射强迫的影响。我们使用生物地球化学生态系统模型 N14CP，该模型考虑了由历史 Ndep 的新重建驱动的 C（碳）、N 和 P（磷）之间的相互作用，以评估英国半自然景观中土壤有机碳（SOC）库对人为变化的响应。我们计算出，Ndep 导致的净初级生产力的增加增加了 C 向土壤的碎屑输入，导致 1750-2010 年间土壤 SOC 平均增加 1.2 kgCm−2 (c. 10%)。模拟结果与 20 世纪末观察到的表土 SOC 浓度变化一致，该变化是根据近 2000 个现场的采样重采样测量得出的。预计超过一半 (57%) 的额外表土 SOC 周转时间较短（约 20 年），因此对 Ndep 的未来变化敏感。该结果首次验证了 Ndep 效应与区域现场尺度 SOC 观测的模型预测。它们证明了长期大量营养素相互作用的重要性以及陆地碳循环中土壤反应的短暂性。
Fertilization of nitrogen (N)-limited ecosystems by anthropogenic atmospheric nitrogen deposition (Ndep) may promote CO2 removal from the atmosphere, thereby buffering human effects on global radiative forcing. We used the biogeochemical ecosystem model N14CP, which considers interactions among C (carbon), N and P (phosphorus), driven by a new reconstruction of historical Ndep, to assess the responses of soil organic carbon (SOC) stocks in British semi-natural landscapes to anthropogenic change. We calculate that increased net primary production due to Ndep has enhanced detrital inputs of C to soils, causing an average increase of 1.2 kgCm−2 (c. 10%) in soil SOC over the period 1750–2010. The simulation results are consistent with observed changes in topsoil SOC concentration in the late 20th Century, derived from sample-resample measurements at nearly 2000 field sites. More than half (57%) of the additional topsoil SOC is predicted to have a short turnover time (c. 20 years), and will therefore be sensitive to future changes in Ndep. The results are the first to validate model predictions of Ndep effects against observations of SOC at a regional field scale. They demonstrate the importance of long-term macronutrient interactions and the transitory nature of soil responses in the terrestrial C cycle.