Trapped Urban Phosphorus: An Overlooked and Inaccessible Stock in the Anthropogenic Phosphorus Cycle

文献类型： 外文期刊

第一作者： Chen, Xuanjing

作者： Chen, Xuanjing;Lakshmanan, Prakash;Sun, Ying;Zhang, Fusuo;Chen, Xinping;Shi, Xiaojun;Cao, Ning;Li, Zheng;Chen, Xuanjing;Kroeze, Carolien;Strokal, Maryna;Lakshmanan, Prakash;Lakshmanan, Prakash;Lakshmanan, Prakash;Wu, Jiechen;Ma, Lin;Bai, Zhaohai

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关键词： urban expansion; waste disposal; legacy phosphorus; recycling; crop production

期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：11.3； 五年影响因子：12.4 ）

ISSN： 0013-936X

年卷期： 2024 年 58 卷 43 期

页码：

收录情况： SCI

摘要： Urban landscapes are high phosphorus (P) consumption areas and consequently generate substantial P-containing urban solid waste (domestic kitchen wastes, animal bones, and municipal sludge), due to large population. However, urbanization can also trap P through cultivated land loss and urban solid waste disposal. Trapped urban P is an overlooked and inaccessible P stock. Here, we studied how urbanization contributes to trapped urban P and how it affects the P cycle. We take China as a case study. Our results showed that China generated a total of 13 (+/- 0.9) Tg urban trapped P between 1992-2019. This amounts to 6 (+/- 0.5) % of the total consumed P and 9 (+/- 0.6) % of the chemical fertilizer P used in China over that period. The loss of cultivated land accounted for 15% of the trapped urban P, and half of this was concentrated in three provinces: Shandong, Henan, and Hebei. This is primarily since nearly one-third of the newly expanded urban areas are located within these provinces. The remaining 85% of trapped urban P was associated with urban solid waste disposal. Our findings call for more actions to preserve fertile cultivated land and promote P recovery from urban solid waste through sound waste classification and recycling systems to minimize P trapped in urban areas.

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