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Open AccessArticle

Phosphorus Forms and Associated Properties along an Urban–Rural Gradient in Southern China

School of Land Resource and Environment, Jiangxi Agricultural University, 1101 Zhimin Road, Nanchang 330045, China
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Author to whom correspondence should be addressed.
Guobing Qin and Jianfu Wu contributed equally to this work.
Water 2019, 11(12), 2504; https://doi.org/10.3390/w11122504
Received: 30 September 2019 / Revised: 20 November 2019 / Accepted: 25 November 2019 / Published: 27 November 2019
(This article belongs to the Special Issue Rainfall Interception Processes and Urban Hydrology)
Urbanization is widely assumed to degrade soil ecosystem services, but the changes in the urban soil phosphorus (P) status due to urbanization and the associated environmental implications have rarely been studied. The objective of this study was to investigate the P forms and associated soil properties in urban soils. Thirty sites were selected along an urban–rural gradient in Nanchang, China, to examine the effects of urbanization on soil P fractions. Residual P and NaOH-extractable P (NaOH-Pi and NaOHPo) were the major P forms in the 0–30 cm of urban soils, comprising on average 37% and 43% of the total P pool, respectively, similar to the suburban and rural soils. Compared with non-urban soils, urban soil had higher contents of total P and P fractions (i.e., PH2O, PKCl, NaOH-Pi, PHCl, and residual P), as well as higher contents of related soil P-retentive properties, especially soil pH and Mehlich 3-extractable Ca and Mg. Phosphorus enrichment in the urban soils may become a source of aquatic pollution because the soil labile P content (the sum of PH2O and PKCl) was positively related to total P, PHCl, NaOH-Pi, and residual P, which implied that the labile P can be replenished by these P pools. This study increased the understanding of P stabilization characteristics (e.g., the specific P forms) of urban soils and has further implications for urban environmental management.
Keywords: technosol; phosphorus; urbanization; eutrophication; land use technosol; phosphorus; urbanization; eutrophication; land use
MDPI and ACS Style

Qin, G.; Wu, J.; Zheng, X.; Zhou, R.; Wei, Z. Phosphorus Forms and Associated Properties along an Urban–Rural Gradient in Southern China. Water 2019, 11, 2504.

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