Differential factors determine the response of soil P fractions to N deposition in wet and dry seasons in a subtropical Moso bamboo forest.

Autor: Zeng, Quanxin, Fan, Yuexin, Zhang, Qiufang, Yuan, Xiaochun, Lin, Kaimiao, Zhou, Jiacong, Lin, Huiying, Xie, Huan, Cui, Juyan, Wu, Yue, Chen, Yuehmin
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Zdroj: Plant & Soil; May2024, Vol. 498 Issue 1/2, p161-179, 19p
Abstrakt: Background: Elevated nitrogen deposition can alter the soil P (phosphorous) composition and availability, thereby affecting long-term plant growth. However, the effects of N (nitrogen) deposition and seasonal changes on soil P fractions in subtropical forests remain elusive. Methods: We conducted an experiment to simulate N deposition in a subtropical Phyllostachys pubescens (Moso bamboo) forest. We collected samples during the wet and dry seasons (2018–2019) and determined soil abiotic and biotic factors and soil P fractions. Results: N deposition in the wet season significantly reduced the content and proportion of labile P and organic P extracted from NaOH, wherein it markedly increased only NaHCO3-Pi content during the dry season. Redundancy analysis and structural equation model showed that soil P was primarily affected by acid phosphatase and root P content under N deposition in the wet season, whereas organic-bound Fe (Fep) and NO3−-N concentrations under N deposition treatment were the key factors during the dry season. These factors explained 22.5% and 9.2%, and 21.0% and 15.4% of the changes in soil P fractions in the wet and dry seasons, respectively. Conclusions: Our study suggests that N deposition accelerates the soil P cycle in the wet season due to increased plant P absorption and acid phosphatase activity. N had a minor effect on soil P fractions in the dry season because of decreasing P adsorption from Fe and Al oxides. These findings provide insights into understanding soil P transformation and supply in response to N deposition and seasonal changes in subtropical forests. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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