Differential responses of soil phosphorus fractions to nitrogen and phosphorus fertilization: a global meta-analysis
Yu, Qingshui (Peking University. College of Urban and Environmental Sciences)
Hagedorn, Frank (Swiss Federal Institute for Forest)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Tan, Xiangping (Chinese Academy of Sciences. South China Botanical Garden)
Yan, Zhengbing (Chinese Academy of Sciences. Institute of Botany)
He, Chenqi (Peking University. College of Urban and Environmental Sciences)
Ni, Xiaofeng (Peking University. College of Urban and Environmental Sciences)
Feng, Yuhao (Peking University. College of Urban and Environmental Sciences)
Zhu, Jiangling (Peking University. College of Urban and Environmental Sciences)
Ji, Chengjun (Peking University. College of Urban and Environmental Sciences)
Tang, Zhiyao (Peking University. College of Urban and Environmental Sciences)
Li, Mai-He (Swiss Federal Institute for Forest. Snow and Landscape Research)
Fang, Jingyun (Yunnan University. College of Ecology and Environmental Sciences)

Data:	2024
Resum:	Anthropogenic inputs of nitrogen (N) and phosphorus (P) to terrestrial ecosystems alter soil nutrient cycling. However, the global-scale responses of soil P fractions to N and P inputs and their underlying mechanisms remain elusive. We conducted a global meta-analysis based on 818 observations of soil P fractions from 99 field N and P addition experiments in forest, grassland, and cropland ecosystems ranging from temperate to tropical zones. Our global meta-analysis revealed distinct responses of soil P fractions to N and P enrichment. For studies using the Chang and Jackson inorganic (Pi) method, we found that high N addition promoted the transformation of immobile Pi fractions into Ferrum/Aluminum-bound Pi and available Pi in surface soils through soil acidification. However, this acid-induced transformation of Pi fractions by N addition was observed only in Calcium-rich soils, while in acidic soils, further acidification led to increase P binding. In contrast, additions of P alone or combined with N significantly increased all soil Pi fractions. Regarding the Hedley P fractions, N addition generally decreased labile organic P by enhancing soil acid phosphatase activity. The responses of other P fractions were influenced by soil pH, fertilization rates, ecosystem type, and other factors. P addition increased most soil P fractions. Overall, both P fractionation methods consistently demonstrate that N inputs deplete soil P and accelerate P cycling, while P inputs increase most soil P fractions, alleviating P limitation. These findings are crucial for predicting the effects of future atmospheric N and P deposition on P cycling processes.
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Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Nitrogen deposition ; Phosphorus input ; Posphorus fractions ; Soil acidification ; Eutrophication ; Meta-analysis
Publicat a:	Global biogeochemical cycles, Vol. 38, issue 7 (July 2024) , p. e2023GB008064, ISSN 1944-9224

DOI: 10.1029/2023GB008064

Postprint 33 p, 1.5 MB

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