Nitrogen enrichment buffers phosphorus limitation by mobilizing mineral-bound soil phosphorus in grasslands

Phosphorus (P) limitation is expected to increase due to nitrogen (N)-induced terrestrial eutrophication, although most soils contain large P pools immobilized in minerals (Pi) and organic matter (Pₒ). Here we assessed whether transformations of these P pools could increase plant available pools all...

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Vydáno v:	Ecology (Durham) Ročník 103; číslo 3; s. 1 - 15
Hlavní autoři:	Wang, Ruzhen, Yang, Junjie, Liu, Heyong, Sardans, Jordi, Zhang, Yunhai, Wang, Xiaobo, Wei, Cunzheng, Lü, Xiaotao, Dijkstra, Feike A., Jiang, Yong, Han, Xingguo, Peñuelas, Josep
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Hoboken, USA John Wiley and Sons, Inc 01.03.2022 John Wiley & Sons, Inc Ecological Society of America
Témata:	Anthropogenic factors Aridity Biogeochemical cycles Buffers climosequence dry environmental conditions Ecosystem ecosystems Eutrophication Fractions Grassland Grasslands Iron Leaching Minerals mineral‐bound phosphorus Nitrogen Nitrogen - analysis nitrogen content nitrogen deposition Nitrogen enrichment Organic matter pH effects Phosphorus phosphorus limitation phosphorus mobilization precipitation gradient Soil Soil chemistry Soil pH Soils phosphorus mobilization mineral-bound phosphorus phosphorus limitation precipitation gradient nitrogen deposition climosequence
ISSN:	0012-9658, 1939-9170, 1939-9170
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Shrnutí:	Phosphorus (P) limitation is expected to increase due to nitrogen (N)-induced terrestrial eutrophication, although most soils contain large P pools immobilized in minerals (Pi) and organic matter (Pₒ). Here we assessed whether transformations of these P pools could increase plant available pools alleviating P limitation under enhanced N availability. The mechanisms underlying these possible transformations were explored by combining results from a 10-year field N addition experiment and a 3700-km transect covering wide ranges in soil pH, soil N, aridity, leaching, and weathering that could affect soil P status in grasslands. Nitrogen addition promoted the dissolution of immobile Pi (mainly Ca-bound recalcitrant P) to more available forms of Pi (including Al- and Fe-bound P fractions and Olsen P) by decreasing soil pH from 7.6 to 4.7, but did not affect Pₒ. Soil total P declined by 10% from 385 ± 6.8 to 346 ± 9.5 mg kg−1, whereas available P increased by 546% from 3.5 ± 0.3 to 22.6 ± 2.4 mg kg−1 after the 10-year N addition, associated with an increase in Pi mobilization, plant uptake, and leaching. Similar to the N addition experiment, the drop in soil pH from 7.5 to 5.6 and increase in soil N concentration along the grassland transect were associated with an increased ratio between relatively mobile Pi and immobile Pi. Our results provide a new mechanistic understanding of the important role of soil Pi mobilization in maintaining plant P supply and accelerating biogeochemical P cycles under anthropogenic N enrichment. This mobilization process temporarily buffers ecosystem P limitation or even causes P eutrophication, but will extensively deplete soil P pools in the long run.
Bibliografie:	Funding information Ruzhen Wang, Junjie Yang, and Heyong Liu contributed equally to this work. European Research Council Synergy grant, Grant/Award Number: ERC‐SyG‐2013‐610028 IMBALANCE‐P; National Key Research and Development Program of China, Grant/Award Number: 2016YFC0500707; National Natural Science Foundation of China, Grant/Award Numbers: 31430016, 31770525, 31870441; Spanish government grant, Grant/Award Number: PID2019‐110521GB‐I00 Handling Editor Hugh Henry ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0012-9658 1939-9170 1939-9170
DOI:	10.1002/ecy.3616