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Temporal and spatial variations of net anthropogenic nitrogen inputs (NANI) in the Pearl River Basin of China from 1986 to 2015

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  • Xia Cui
  • Caizhu Huang
  • Jiapeng Wu
  • Xiaohan Liu
  • Yiguo Hong

Abstract

Human activities have greatly influenced the natural nitrogen cycle, causing dramatic degradation of ecosystem function. Net anthropogenic nitrogen input (NANI) is an important factor contributing to the impact of human activities on the regional nitrogen cycle. Here, we analyzed the temporal and spatial variation of NANI in the Pearl River Basin of China between 1986 to 2015, and found that the total amount of NANI significantly increased from 3,362.25 kg N km-2 yr-1 to 8,071.15 kg N km-2 yr-1. Application of nitrogen fertilizers was the largest component of NANI in the Basin, accounting for 55.53% in the total NANI, followed by food/feed net nitrogen input (21.26%), atmospheric nitrogen deposition (12.95%), and crop nitrogen fixation (10.26%). Over the last three decades, nitrogen inputs from atmospheric nitrogen deposition have become the second largest source of NANI due to rapid industrialization and urbanization in the region. Regression analysis showed that the rapid growth of both GDP and population density were the main contributors to the increase of NANI. In addition, the increase in the number of red tides in the Pearl River Estuary was strongly correlated with NANI discharge (R2 = 0.90, p

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  • Xia Cui & Caizhu Huang & Jiapeng Wu & Xiaohan Liu & Yiguo Hong, 2020. "Temporal and spatial variations of net anthropogenic nitrogen inputs (NANI) in the Pearl River Basin of China from 1986 to 2015," PLOS ONE, Public Library of Science, vol. 15(2), pages 1-14, February.
    • Handle: RePEc:plo:pone00:0228683
    DOI: 10.1371/journal.pone.0228683
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    1. Xin Zhou & Chunqing Chen & Fajin Chen & Zhiguang Song, 2021. "Changes in net anthropogenic nitrogen input in the watershed region of Zhanjiang Bay in south China from 1978 to 2018," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 23(12), pages 17201-17219, December.
    2. Maria Cunha & João Marques & José Azevedo & Ana Castilho, 2021. "Understanding the Impact of a Major Hydro-Agricultural Project in Low Mondego Area (Portugal)," Land, MDPI, vol. 10(2), pages 1-28, January.

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