Соnstruсtiоn оf Nitrоgеn Emissiоn Invеntоrу аt Sub-bаsin Sсаlе аnd Аnаlуsis оf Kеу Sоurсеs in Fuxiаn Lаkе Wаtеrshеd

被引：0

作者：

Wang Y.-J. ^{[1
]}

Liang Q.-B. ^{[1
]}

Wang Y.-X. ^{[1
]}

Hou L. ^{[1
]}

Chen Q.-B. ^{[1
]}

Wang W. ^{[2
]}

Li X.-L. ^{[1
]}

Gao J.-S. ^{[1
]}

机构：

[1] College of Ecology and Environment, Southwest Forestry University, Kunming

[2] Yunnan Blue Environment Engineering Co., Kunming

来源：

Huanjing Kexue/Environmental Science | 2024年 / 45卷 / 04期

关键词：

emission inventory; key source; plateau deep water lake; sub-watershed; total nitrogen（TN）;

D O I：

10.13227/j.hjkx.202305038

中图分类号：

学科分类号：

摘要：

It is essential to control lake eutrophication to reduce total nitrogen（TN）emission from lake watersheds. However，owing to the lack of a TN emission list at the sub-basin scale and over a long period，the key factor of water degradation cannot be identified，and effective measures cannot be taken. Thus，in our study，taking Fuxian Lake，a typical deep lake，as an example and based on the characteristics of the sub-basins，a TN emission list at the sub-basin scale was constructed through the GIS platform to quantify the temporal-spatial distribution of TN pollution loading，and the main source of TN from 25 sub-basins during the period 1990-2020 was identified. The results showed：1 the TN pollution loading in 1990，1995，2000，2005，2010，2015，and 2020 was 933. 43，1 012. 90，1 090. 25，1 096. 93，1 075. 69，996. 27，and 514. 80 t，respectively. Non-point source pollution was the dominant source，which mainly came from synthetic fertilizer. Point pollution increased over time，and rural residential pollution was an important source. 2 The overall TN pollution that manifested in this basin decreased radially，with the highest load per unit area mainly found between 65 and 6 877 kg·km-2. Additionally，the downstream sun-basin（1 009-6 877 kg·km-2）had a much higher TN pollution load per unit area than the upstream（65-1 167 kg·km-2）sub-basin. 3 The pollution sources showed clear spatial heterogeneity among sub-basins. Fertilizer application and rural residential pollution mainly came from the Zhigou River，Fucheng River，and Shanjihe River sub-basins located in the northern watershed. On the other hand，TN pollution in the Datikanjing River，Dajing River，and Shigujing River sub-basins in the eastern watershed came from animal manure applied to crop land. This study can provide scientific evidence and technical support for the implementation of TN source control and emission reduction measures，formulate differentiated sub-basin management measures，and improve water quality at the Fuxian Lake watershed. © 2024 Science Press. All rights reserved.

引用

页码：2150 / 2159

页数：9

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