Spatiotemporal variations and determinants of stream nitrogen and phosphorus concentrations from a watershed in the Three Gorges Reservoir Area, China

Jun, Deng; Zhou, Yiwen; Chu, Lin; Wei, Yujie; Li, Zhaoxia; Wang, Tianwei; Dai, Cuiting

doi:10.1016/j.iswcr.2022.09.004

Cited by 9 publications

(4 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The watershed is sparsely populated, devoid of industrial point sources or grazing land distribution. Since the 1980s, a considerable portion of forested land has undergone conversion to citrus cultivation, making citrus cultivation the primary economic activity in the region [27]. To enhance citrus production, a substantial amount of fertilizer is applied.…”

Section: Study Areamentioning

confidence: 99%

“…However, the nonlinear interactions of nutrient transport and transformation processes in hydrologic models can be challenging to intuitively understand and may require other methods to account for N and P load drivers [21]. Previous studies have often used correlation analysis [26], multiple linear regression [27], and redundancy analysis [28] to analyze factors affecting water quality changes based on sampling data from a few monitoring sites. However, these studies often overlook the spatial variability of pollutant loads, making it difficult to assess the impact of drivers from the spatial perspective of the watershed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimizing Non-Point Source Pollution Management: Evaluating Cost-Effective Strategies in a Small Watershed within the Three Gorges Reservoir Area, China

Chang,

Wang,

Liu

et al. 2024

Land

View full text Add to dashboard Cite

Non-point source (NPS) pollution poses a significant threat to the water environment, yet controlling it at the watershed scale remains a formidable challenge. Understanding the characteristics and drivers of nitrogen (N) and phosphorus (P) outputs at the watershed scale, along with identifying cost-effective best management practices (BMPs), is crucial for effective pollution control. In this study, we utilized the Wangjiaqiao watershed within the Three Gorges Reservoir Area (TGRA) as a case study to explore the characteristics of N and P load outputs and their dominant drivers by combining the SWAT model and a geographic detector. Based on our analysis of N and P loads within the watershed, we employed the entropy weight method to evaluate the reduction efficiency and cost-effectiveness of 64 BMP scenarios, encompassing seven measures (vegetative filter strips, parallel terraces, 10% fertilizer reduction, 30% fertilizer reduction, residue cover tillage, grass mulching, and returning farmland to forest) and their combinations. Our findings revealed the following: (1) spatial heterogeneity in NPS loads within the watershed, primarily influenced by land use, fertilizer application, and surface runoff, with interactive enhancement effects among driving factors; (2) the differential effectiveness of BMPs at the watershed level, with structural measures, particularly terracing, exhibiting higher efficacy and achieving reduction rates of 28.12% for total nitrogen (TN) and 37.69% for total phosphorus (TP); the combined BMPs showed improved reduction efficiency, but not merely additive; and (3) in terms of cost-effectiveness, 30% fertilizer reduction emerged as the most beneficial among the individual measures. Moreover, a combination of vegetative filter strips, parallel terraces, and 30% fertilizer reduction demonstrated significant improvements in TN and TP reductions (48.05% and 61.95%, respectively), suggesting their widespread applicability. Overall, our study provides insights into developing a cost-effective BMP strategy for the Wangjiaqiao watershed and offers valuable guidance for NPS pollution management in similar small watersheds within the TGRA.

show abstract

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimizing Non-Point Source Pollution Management: Evaluating Cost-Effective Strategies in a Small Watershed within the Three Gorges Reservoir Area, China

Chang,

Wang,

Liu

et al. 2024

Land

View full text Add to dashboard Cite

show abstract

“…Some scholars have described the current situation of water pollution from economic factors and discovered that various factors such as the industrialization rate, urban-rural income gap, agricultural production structure, financial support for agriculture, and natural conditions have differing efficiencies in agricultural three-dimensional pollution discharge across different regions [ 8 , 9 ].Furthermore, agricultural pollution loads tend to grow faster in low-income countries [ 10 ]. Regarding the impact of income disparity on water pollution, some scholars argue that its effect on environmental quality varies across countries with different income levels.…”

Section: Introductionmentioning

confidence: 99%

Examining the U-shaped relationship between non-agricultural sources water pollution and the urban-rural income gap

He,

Sheng,

Tian

2024

PLoS ONE

View full text Add to dashboard Cite

Determining how the economy and society interact with the environment of water quality is essential to determining the financial impact of green development. Based on China’s provincial panel data from 2010 to 2021, this research considers non-agricultural sources of water pollution (NASWP) as a negative factor of production, investigates its influence on the urban-rural divide, and explains the mechanism of action. The empirical results show that there is a significant correlation between NASWP and the urban-rural gap, with a "U-shaped" relationship between the two. Water pollution first reduces and then increases the urban-rural income gap, and the results are robust after considering endogeneity. Mechanistic research demonstrates that NASWP cause a loss in food output, which in combination with changes in food prices and food subsidy programs impacts the incomes of rural dwellers, thereby having an influence on the urban-rural income gap. Using the threshold effect model, it is discovered that under the combined influence of agricultural mechanization and food subsidy policy, the relationship between NASWP and urban-rural income divide exhibits an U-shape in areas with high agricultural mechanization and an "inverted U" shape in areas with low agricultural mechanization.

show abstract

“…Mountains cover approximately 30% of the global land area and play an important role not only in hydrological protection, climate regulation, and biodiversity conservation but also in product supply and socioeconomic development (Deng et al, 2015;Feng et al, 2021). Moreover, mountains are important for studying the relationship between surface pollen assemblages and modern vegetation and climate because of their topography and air transport mechanisms for pollen dispersal (Lu et al, 2011;Pan et al, 2013;Yang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Modern pollen assemblages and their relationships with vegetation and climate on the northern slopes of the Tianshan Mountains, Xinjiang, China

Zhang

et al. 2023

J. Arid Land

View full text Add to dashboard Cite

The reconstruction of paleovegetation and paleoclimate requires an understanding of the relationships between surface pollen assemblages and modern vegetation and climate. Here, we analyzed the characteristics of surface pollen assemblages across different vegetation zones in the Tianshan Mountains. Using surface pollen analysis and vegetation sample surveys at 75 sites on the northern slopes of the Tianshan Mountains, we determined the correlation between the percentage of dominant pollen types and the corresponding vegetation cover. Redundancy analysis was used to investigate the relationships between surface pollen assemblages and environmental factors. Our results show that the Tianshan Mountains contain several distinct ecological regions, which can be divided into five main vegetation zones from low to high altitudes: mountain desert zone (

show abstract

Spatiotemporal variations and determinants of stream nitrogen and phosphorus concentrations from a watershed in the Three Gorges Reservoir Area, China

Cited by 9 publications

References 57 publications

Optimizing Non-Point Source Pollution Management: Evaluating Cost-Effective Strategies in a Small Watershed within the Three Gorges Reservoir Area, China

Optimizing Non-Point Source Pollution Management: Evaluating Cost-Effective Strategies in a Small Watershed within the Three Gorges Reservoir Area, China

Examining the U-shaped relationship between non-agricultural sources water pollution and the urban-rural income gap

Modern pollen assemblages and their relationships with vegetation and climate on the northern slopes of the Tianshan Mountains, Xinjiang, China

Contact Info

Product

Resources

About