Mapping global soil acidification under N deposition.
Glob Chang Biol
; 29(16): 4652-4661, 2023 Aug.
Article
em En
| MEDLINE
| ID: mdl-37296534
ABSTRACT
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.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Solo
/
Ecossistema
Tipo de estudo:
Systematic_reviews
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article