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A global analysis of soil acidification caused by nitrogen addition
文献类型：SCI/SSCI论文
| 作者 | Tian D. S.; Niu, S. L. |
| 发表日期 | 2015 |
| 关键词 | nitrogen deposition metal cations meta-analysis soil pH terrestrial ecosystem acid buffering capacity aluminum toxicity temperate forests european forests organic-matter metaanalysis deposition calcium cations plants grasslands |
| 英文摘要 | Nitrogen (N) deposition-induced soil acidification has become a global problem. However, the response patterns of soil acidification to N addition and the underlying mechanisms remain far from clear. Here, we conducted a meta-analysis of 106 studies to reveal global patterns of soil acidification in responses to N addition. We found that N addition significantly reduced soil pH by 0.26 on average globally. However, the responses of soil pH varied with ecosystem types, N addition rate, N fertilization forms, and experimental durations. Soil pH decreased most in grassland, whereas boreal forest was not observed a decrease to N addition in soil acidification. Soil pH decreased linearly with N addition rates. Addition of urea and NH4NO3 contributed more to soil acidification than NH4-form fertilizer. When experimental duration was longer than 20 years, N addition effects on soil acidification diminished. Environmental factors such as initial soil pH, soil carbon and nitrogen content, precipitation, and temperature all influenced the responses of soil pH. Base cations of Ca2+, Mg2+ and K+ were critical important in buffering against N-induced soil acidification at the early stage. However, N addition has shifted global soils into the Al3+ buffering phase. Overall, this study indicates that acidification in global soils is very sensitive to N deposition, which is greatly modified by biotic and abiotic factors. Global soils are now at a buffering transition from base cations (Ca2+, Mg2+ and K+) to non-base cations (Mn2+ and Al3+). This calls our attention to care about the limitation of base cations and the toxic impact of nonbase cations for terrestrial ecosystems with N deposition. |
| 出处 | Environmental Research Letters |
| 卷 | 10 |
| 期 | 2 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1748-9326 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/38878]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Tian D. S.,Niu, S. L.. A global analysis of soil acidification caused by nitrogen addition. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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