绘制氮沉降下的全球土壤酸化图,Global Change Biology

当前位置： X-MOL 学术 › Glob. Change Biol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

绘制氮沉降下的全球土壤酸化图
Global Change Biology ( IF 10.8 ) Pub Date : 2023-06-09 , DOI: 10.1111/gcb.16813
Chen Chen ₁ , Wenya Xiao ₂ , Han Y H Chen ₁

Affiliation

土壤pH值对于调节土壤养分至关重要，从而影响陆地生态系统的生物多样性和生态系统功能。尽管氮 (N) 污染的威胁持续存在，特别是在快速发展的地区，但目前尚不清楚氮沉降的增加如何影响全球陆地生态系统的土壤 pH 值。通过对涵盖主要陆地生态系统类型的 634 项研究中氮添加和控制下的土壤 pH 值进行配对观察进行全球荟萃分析，我们发现土壤酸化随着氮添加量的增加而迅速增加，并且在中性 pH 土壤中最为严重。在高氮添加下，草地土壤 pH 值下降最为强烈，而湿地的酸化程度最轻。通过将这些关系外推到全局映射，我们发现，大气氮沉降导致过去40年全球平均土壤pH值下降-0.16，美国东部、巴西南部、欧洲、南亚和东亚地区是氮沉降土壤酸化的热点地区。我们的研究结果强调，人为放大的大气氮沉降已经深刻改变了全球土壤的 pH 值和化学成分。他们认为大气氮沉降是对全球陆地生物多样性和生态系统功能的主要威胁。

"点击查看英文标题和摘要"

Mapping global soil acidification under N deposition

Soil pH is critically important in regulating soil nutrients and thus influencing the biodiversity and ecosystem functions of terrestrial ecosystems. Despite the ongoing threat of nitrogen (N) pollution especially in the fast-developing regions, it remains unclear how increasing N deposition affects soil pH across global terrestrial ecosystems. By conducting a global meta-analysis with paired observations of soil pH under N addition and control from 634 studies spanning major types of terrestrial ecosystems, we show that soil acidification increases rapidly with N addition amount and is most severe in neutral-pH soils. Grassland soil pH decreases most strongly under high N addition while wetlands are the least acidified. By extrapolating these relationships to global mapping, we reveal that atmospheric N deposition leads to a global average soil pH decline of −0.16 in the past 40 years and regions encompassing Eastern United States, Southern Brazil, Europe, and South and East Asia are the hotspots of soil acidification under N deposition. Our results highlight that anthropogenically amplified atmospheric N deposition has profoundly altered global soil pH and chemistry. They suggest that atmospheric N deposition is a major threat to global terrestrial biodiversity and ecosystem functions.

更新日期：2023-06-09

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南