[Impact Analysis of Different Buffer Scale Landscape Patterns on Water Quality of the Fourth Drainage Ditch in Ningxia Yellow River Irrigation Area].

Q2 Environmental Science
Ji-Long Ma, Kun Ma, Tie-Na Xie, Jian-Jun Ma, Hong Li, Xiang Yue, Lin-Pu Han, Yong-Jie Qi, Jia-Qi Gao, Biao Jia
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引用次数: 0

Abstract

Landscape patterns at specific spatial scales can respond to the sources of non-point source pollutants in water bodies and the surface landscape's ability to absorb them. To investigate the influence of landscape patterns on the water quality of the drainage ditch at different circular buffer scales, the fourth drainage ditch of the Ningxia Yellow River Irrigation Area (YDIA) was taken as the research object, and based on the land-use data in 2022 and the dynamic water quality monitoring data of 26 sampling points from 2021 to 2022, five circular buffer scales, including 100, 200, 500, 1 000, and 2 000 m, were set up, and three methods. Landscape pattern analysis, Spearman rank correlation analysis, and redundancy analysis were used to filter the water quality of the drainage ditch. Landscape pattern analysis, Spearman rank correlation analysis, and redundancy analysis were used to screen out the optimal buffer scales and corresponding key landscape indicators to explain the changes in water quality and to analyze the response relationship between the water quality of the drainage ditch and landscape features. The results showed that: ① The fourth drainage ditch in Ningxia Huang Irrigation Area was mostly polluted by high nitrogen, and more than 70% of the TN indexes exceeded the standard limit for Class V water throughout the year, while the TP indexes did not exceed the standard limit for Class III water, which was less polluted. ② The landscape characteristics at the scale of the 200 m circular buffer zone had a close relationship with the water quality indexes of the two periods, and the explanation rates of the fallow period and the cultivation period at that scale were the highest, 45.76% and 44.14%, respectively, and the explanation rate was the highest, 47.63% and 45.83%, respectively, which was the best buffer scale for discriminating the water quality of the fourth drainage ditch. ③ Cultivated land was the main 'source' land use type within the optimal buffer zone, which was the main factor affecting the change of pollutants in the drainage ditch. Followed by the spreading index, aggregation index, scattering and juxtaposition index, and fragrance uniformity, which were the main landscape factors affecting the change of water quality. Therefore, when optimizing the landscape pattern method for monitoring and controlling water pollution in drainage ditches, it is recommended to strictly control the proportion of arable land and other 'source' land-use types within the 200 m circular buffer zone, and at the same time, improve the diversity, connectivity, and aggregation of the landscape. The results of this study can provide new ideas and solutions for monitoring and analyzing the water quality of drainage ditches in Ningxia's Yellow River Irrigation District.

[宁夏黄河灌区不同缓冲尺度景观格局对第四排水沟水质的影响分析]。
特定空间尺度上的景观格局能够响应水体中非点源污染物的来源和地表景观对它们的吸收能力。探讨景观模式的影响水质的排水沟在不同循环缓冲区范围内,四周排水沟宁夏黄河灌区(YDIA)作为研究对象,基于2022年的土地利用数据和26个采样点的动态水质监测数据从2021年到2022年,五个环形缓冲区的范围内,包括100,200,500,000,000和2,设置,三个方法。采用景观格局分析、Spearman秩相关分析和冗余分析对排水沟水质进行了过滤。通过景观格局分析、Spearman秩相关分析和冗余分析,筛选出最优缓冲尺度和对应的关键景观指标,解释水质变化,分析排水沟水质与景观特征的响应关系。结果表明:①宁夏黄灌区4号排水沟以高氮污染为主,全年有70%以上的TN指标超过V类水的标准限值,TP指标未超过污染较轻的III类水的标准限值。②200 m环形缓冲带尺度上的景观特征与两个时期的水质指标关系密切,其中休耕期和耕耕期的解释率最高,分别为45.76%和44.14%,解释率最高,分别为47.63%和45.83%,是判别第四排沟水质的最佳缓冲尺度。③最优缓冲带内耕地是主要的“源”土地利用类型,是影响排水沟污染物变化的主要因素。其次是扩散指数、聚集指数、散射并置指数和香味均匀性,这是影响水质变化的主要景观因素。因此,在优化排水沟水污染监测与控制景观格局方法时,建议严格控制200 m环形缓冲带内耕地和其他“源”用地类型的比例,同时提高景观的多样性、连通性和聚集性。研究结果可为宁夏黄河灌区排水沟水质监测与分析提供新的思路和解决方案。
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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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