Discussing on “source-sink” landscape theory and phytoremediation for non-point source pollution control in China

Wang, Rongjia; Wang, Ying; Sun, Shi-Yong; Cai, Chunju; Zhang, Jianfeng

doi:10.1007/s11356-020-10952-4

Cited by 29 publications

(8 citation statements)

References 68 publications

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“…If the spatial distribution of source and sink landscapes in a region reaches a balanced state and forms a reasonable spatial distribution pattern, fewer non-point source pollutants will be generated. In contrast, if the spatial distribution of the landscape in a region is not reasonable (for example, the source landscape is distributed nearer to the water body, while the sink landscape is distributed further away from the water body), more pollutants may be generated [42].…”

Section: Source-sink Landscape Type Determinationmentioning

confidence: 99%

Spatiotemporal Transfer of Source-Sink Landscape Ecological Risk in a Karst Lake Watershed Based on Sub-Watersheds

Zhou

Zhao

Lv³

et al. 2023

Land

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Non-point source pollution is an important source of ecological risk in karst lakes. The process of source–sink landscapes is the main pathway of pollution migration and plays an important role in water quality. In this study, the ecological risk evolution in the past 30 years was studied in a karst lake watershed with 495 sub-basins as the basic evaluation unit, and the risk assessment model of non-point source pollution was improved by using rainfall and fertilizer application. The results show that (1) the area of cultivated land shrank significantly, with forest land and construction land showing an upward trend in general; (2) the layout of the sink landscape continuously shrank, while the source landscape gradually expanded, and the space of high load values further increased and shifted from a flower-like layout distribution to concentrated contiguity, with some values exceeding 0.5; (3) the 252 sub-watersheds of the sink landscape migrated from very low risk to low risk, while the risk of the source landscape changed from medium risk to high and very high risk in 48 sub-watersheds; and (4) in terms of the overall trend of ecological risk transformation of the source–sink landscape, the transformation of sink landscapes to source landscapes was greater than that of source landscapes to sink landscapes, and the overall ecological risk showed an increasing trend.

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Section: Source-sink Landscape Type Determinationmentioning

confidence: 99%

Spatiotemporal Transfer of Source-Sink Landscape Ecological Risk in a Karst Lake Watershed Based on Sub-Watersheds

Zhou

Zhao

Lv³

et al. 2023

Land

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“…In this study, the source-sink theory was innovatively introduced as an effective way to identify the source and sink landscape in the N flowing process. Many previous studies have applied source-sink theory to other research, such as on nonpoint pollution of watersheds, the urban heat island effect and carbon cycling [14,18,[44][45][46]. The studies on nonpoint pollution of watersheds found that cropland and residential land were source landscapes, while grassland and forest land were sink landscapes [47,48].…”

Section: A Novel Approach To Identifying N Source-sink Landscapesmentioning

confidence: 99%

“…As for sink landscapes, these are mainly distributed in areas surrounding the city and have low N loads. These sink landscapes mainly include forest and greenbelt lands, which cover and stabilize the soil surface, intercepting rainfall and delaying the timing of surface runoffs of N. At the same time, underneath the soil, the plant root system can absorb and intercept the N in the subsurface runoff and reduce the N loss from surface runoff [14,37]. To trap N pollution with sink landscapes, broadening the forest land and greenbelt can be most effective.…”

Section: Spatial Gradient Characteristics Of Source-sink Landscapes A...mentioning

confidence: 99%

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Dynamic Changes of Nitrogen Loads in Source–Sink Landscapes under Urbanization

Tang

Cui

2022

Land

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The dynamic changes of nitrogen (N) loads have been significantly impacted by the rapid expansion of many cities, potentially escalating the risk of N pollution in cities. However, the spatiotemporal changes of N loads in source and sink landscapes remain unclear in urbanization. In this research, we used source–sink landscape theory to identify the source–sink landscape in the process of N flow at the city scale and investigated the spatiotemporal changes of N loads in the source–sink landscape from 2005 to 2015 in Xiamen, a rapidly urbanizing city in southern China. The total N loads of source landscapes increased by 2 times between 2005 and 2015, with an average annual growth of 26%, while the total N loads of sink landscapes climbed gradually, with an average annual increase of 8%, according to our findings. Moreover, in terms of the spatial gradient, the N loads of the source landscape fluctuated downward and reached their peak in the urban center, whereas the N loads of the sink landscape tended to rise and reached their peak outside of the city. Our findings offered a fresh viewpoint on the source–sink landscape in N flows at the city scale and offered useful guidance for N spatial management to support sustainable city development.

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“…The processes by which ecosystems provide various services to human society are continually undergoing material and energy changes, and these changes can be regarded as an ecological process that includes several subprocesses [1,4]. With respect to supporting ESs, some landscapes act as "source", while others act as "sink", and the attribution of landscapes to these categories can be performed according to their roles in the ES supply process [49,50]. ESV is an important indicator to measure ES supply capacity [51].…”

Section: Land Use Optimization Framework Based On the Source-sink Landscape Of Essmentioning

confidence: 99%

Optimization of Land Use Based on the Source and Sink Landscape of Ecosystem Services: A Case Study of Fengdu County in the Three Gorges Reservoir Area, China

Zhang

Yang

Zhang

et al. 2021

Land

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Promoting the preservation and appreciation of ecosystem services is an important value guide for land use optimization. In this research, Fengdu County in the Three Gorges Reservoir Area was selected as the focus of a case study. From the perspective of the source and sink landscape of ecosystem services, a MOP model and FLUS model were used to optimize the areas of various land use types and the spatial configurations of those land use types in the study area in 2035 under a strict ecological constraint (SEC) scenario, a moderate ecological constraint (MEC) scenario, and a relaxed ecological constraint (REC) scenario. We also superimposed and adjusted the results of land use optimization under the three ecological constraint scenarios, and obtained land use regionalization results that integrated multiple scenarios. The results indicated that (1) there were large differences in the areas and spatial distributions of the source and sink landscapes under the three scenarios. Under the SEC scenario, the important source landscapes (ISLs), common source landscapes (CSLs), and sink landscapes (SLs) areas covered 1676.62 km2, 1190.43 km2, and 33.81 km2, respectively. A large area of the CSLs and a small area of the SLs were transformed into ISLs area, and the degree of fragmentation of the landscape was low. Under the MEC scenario, the ISLs, CSLs, and SLs areas covered 1609.22 km2, 1241.60 km2, and 49.74 km2, respectively. The development of the source landscapes and sink landscapes was similar, and the degree of fragmentation was moderate. Under the REC scenario, the ISLs, CSLs, and SLs areas covered 1603.96 km2, 1243.32 km2, and 53.58 km2, respectively. A large area of CSLs was transformed into SLs area, and the degree of fragmentation was high. (2) Fengdu County was divided into seven types of areas: ecological conservation area; agricultural production area; construction optimization area; construction-ecological area; ecological-agricultural area; agricultural-construction area; and integrated development area. The results of this study can provide references for the territorial spatial planning and management of ecological barrier zones.

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Discussing on “source-sink” landscape theory and phytoremediation for non-point source pollution control in China

Cited by 29 publications

References 68 publications

Spatiotemporal Transfer of Source-Sink Landscape Ecological Risk in a Karst Lake Watershed Based on Sub-Watersheds

Spatiotemporal Transfer of Source-Sink Landscape Ecological Risk in a Karst Lake Watershed Based on Sub-Watersheds

Dynamic Changes of Nitrogen Loads in Source–Sink Landscapes under Urbanization

Optimization of Land Use Based on the Source and Sink Landscape of Ecosystem Services: A Case Study of Fengdu County in the Three Gorges Reservoir Area, China

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