Cleaning up nitrogen pollution may reduce future carbon sinks
Cleaning up nitrogen pollution may reduce future carbon sinks
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清理氮污染可能会减少未来的碳汇
DOI：
10.1016/j.gloenvcha.2017.10.007
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发表时间：
2018-01-01
影响因子：
8.9
通讯作者：
Chen, Deli
中科院分区：
文献类型：
--
作者：
Gu, Baojing;Ju, Xiaotang;Chen, Deli
生物圈碳汇对于降低大气二氧化碳(CO2)浓度以减缓全球变暖至关重要，但受到活性氮(N-r)输入的很大影响。尽管人们已经研究了人为二氧化碳排放和氮沉积(以N-r排放到大气中)对碳汇的影响，但它们的C/N比(C/N)如何随着经济发展而变化，以及这种变化如何改变生物圈碳汇，目前还不清楚。在这里，通过汇编132个国家的数据集，我们发现，尽管人为的二氧化碳和N-r排放到大气中都显示出不对称的参数曲线，但C/N比仍在继续增加。二氧化碳和Nr排放的拐点在全球人均国内生产总值约15,000美元左右。经济增长促进了N-r和能源的使用，同时提高了它们的利用效率，共同导致了二氧化碳和Nr排放拐点的出现。与拐点前后的CO2排放相比，N-r-排放的增加较慢，但下降的速度较快。这意味着随着经济的发展，人类活动产生的二氧化碳排放量将会相对较多，而氮的沉降量将会减少。由于N-r的相对不足，这可能会限制生物圈的碳汇。这一发现应纳入/纳入全球气候变化模型。将氮沉积与区域范围内的碳固存相匹配，全面管理二氧化碳和氮的排放，以维持平衡，这些努力至关重要。
Biosphere carbon sinks are crucial for reducing atmospheric carbon dioxide (CO2) concentration to mitigate global warming, but are substantially affected by the input of reactive nitrogen (N-r). Although the effects of anthropogenic CO2 emission and nitrogen deposition (indicated by N-r emission to atmosphere) on carbon sink have been studied, it is unclear how their ratio (C/N) changes with economic development and how such change alters biosphere carbon sinks. Here, by compiling datasets for 132 countries we find that the C/N ratio continued to increase despite anthropogenic CO2 and N-r emissions to atmosphere both showing an asymmetric pars-curve with economic growth. The inflection points of CO2 and Nr emissions are found at around $15,000 gross domestic product per capita worldwide. Economic growth promotes the use of N-r and energy, while at the same time increases their use efficiencies, together resulting in occurrences of inflection points of CO2 and Nr emissions. N-r-emissions increase slower but decrease faster than that of CO2 emissions before and after the inflection point, respectively. It implies that there will be relatively more anthropogenic CO2 emission but less N deposition with economic growth. This may limit biosphere carbon sink because of relative shortage of N-r. This finding should be integrated/included in global climate change modelling. Efforts, such as matching N deposition with carbon sequestration on regional scale, to manage CO2 and Nr emissions comprehensively to maintain a balance are critical.