Phosphorus flow characteristics in the waste system of Poyang Lake Watershed over the past 70 years

富营养化 环境科学 分水岭 物流分析 肥料 肥料 人口 环境工程 农业 城市化 水文学(农业) 废物管理 营养物 生态学 工程类 人口学 计算机科学 岩土工程 冶金 材料科学 社会学 机器学习 生物
作者
Ying Feng,Wei Liu,Qin Tian,Mengting Wu,Zhiwen Li,Yalan Zhang,Daishe Wu,Evgeny Abakumov,Ekaterina Maksimova,Yondong Zhang,Jianjun Dai,Huoqing Xiao,Xianchuan Xie,Ming Kong
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:941: 173704-173704
标识
DOI:10.1016/j.scitotenv.2024.173704
摘要

With the intensification of human activities, the amount of phosphorus (P)-containing waste has increased. When such waste is not recycled, P is released into the environment, leading to environmental issues such as the eutrophication of water bodies. In this study, based on the material flow analysis method, a P Waste Flow analysis model (P-WFA) was developed to analyze the P flow in the waste system of Poyang Lake, the largest freshwater lake in China. To address the research gap in long-term P flow analysis at the watershed scale, this study quantified the P content in the waste system of the Poyang Lake Watershed from 1950 to 2020. The analysis revealed that from 1950 to 2020, the total P input into the waste system increased from 5.49 × 104 tons in 1950 to 2.28 × 105 tons in 2020. The breeding industry system was identified as the primary source, accounting for 25.19–41.59 % of the total waste system. Over the past 70 years, P loss to surface water from waste systems has been primarily facilitated by manure from the breeding industry, as well as drainage from crop farming systems (77.74 % in 2020). At the same time, the P recycling rate (PRR) of the waste system exhibited an initial increase followed by a decrease, increasing from 44.14 % to 47.75 % before dropping to 44.41 %. Population growth, urbanization, and changes in consumption levels in Jiangxi Province have led to changes in the dietary structure and fertilizer use, consequently affecting the P cycling pattern. This study presents a comprehensive P flow model for waste systems in the Poyang Lake Watershed. This model can be used as a reference to enhance P cycling and manage P loss in other large freshwater lakes.
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