Preliminary Studies on Eutrophication in Fuxian Lake

Yin-xi, LI; Liu, Hong; Ya, LU; Wang, Ling

doi:10.18307/2003.0315

Cited by 13 publications

(1 citation statement)

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“…It is one of the plateau lake basin systems valued by researchers for having one of the most ecologically fragile areas in geoscience in China. A literature review on Lake Fuxian reveals that many scholars have carried out research on its hydrological and water qualities (Xia, Li & Xiong, 2007; Pan et al, 2008; Gao et al, 2013; Zhai et al, 2015; Zhang et al, 2015; Yan et al, 2016; Yao et al, 2017; Chen et al, 2019), aquatic organisms (Xiong et al, 2006; Li et al, 2007; Li et al., 2017a; Li et al., 2017b), eutrophication (Li et al, 2003; Zhang et al, 2012; Xu et al, 2016), LUCC (Liu, Wu & Gao, 2008; Li et al, 2015; Yang et al., 2015; Yang et al, 2016; Dai et al, 2017; Li et al., 2017a; Li et al., 2017b), soil erosion and land degradation (Yang et al, 2016; Ma et al, 2016), vegetation change (Li et al, 2016), water environment economy (Xia et al, 2010; Gao, Chen & Guo, 2014; Xiong et al., 2006), and sustainable development (Duan et al, 2013) based on remote sensing, field monitoring, computer simulation, laboratory analysis, and other technologies. Their results show that, in recent years, with an increase in global changes, a higher level of urbanization, and the acceleration of social and economic development in the basin, the body of Fuxian Lake has shrunken, the water level has decreased significantly, and the water area has gradually narrowed.…”

Section: Introductionmentioning

confidence: 99%

Multi-scale relationship between land use/land cover types and water quality in different pollution source areas in Fuxian Lake Basin

Li¹,

Peng

Jin

et al. 2019

PeerJ

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The spatial-temporal evolution of land use and land cover (LULC) and its multi-scale impact on the water environment is becoming highly significant in the LULC research field. The current research results show that the more significant scale impact on LULC and water quality in the whole basin and the riparian buffer scale is unclear. A consensus has not been reached about the optimal spatial scale problem in the relationship between the LULC and water quality. The typical lake basin of the Fuxian Lake watershed was used as the research area and the scale relationship between the LULC and water quality was taken as the research object. High resolution remote sensing images, archival resources of surveying, mapping and geographic information, and the monitoring data of water quality were utilized as the main data sources. Remote sensing and Geometric Information Technology were applied. A multi-scale object random forest algorithm (MSORF) was used to raise the classification accuracy of the high resolution remote sensing images from 2005 to 2017 in the basin and the multi-scale relationship between the two was discussed using the Pearson correlation analysis method. From 2005 to 2017, the water quality indicators (Chemical Oxygen Demand (COD), Total Phosphorous (TP), Total Nitrogen (TN)) of nine rivers in the lake’s basin and the Fuxian Lake center were used as response variables and the LULC type in the basin was interpreted as the explanation variable. The stepwise selection method was used to establish a relationship model for the water quality of the water entering the lake and the significance of the LULC type was established at p < 0.05.The results show that in the seven spatial scales, including the whole watershed, sub-basin, and the riparian buffer zone (100 m, 300 m, 500 m, 700 m, and 1,000 m): (1) whether it is in the whole basin or buffer zone of different pollution source areas, impervious surface area (ISA), or other land and is positively correlated with the water quality and promotes it; (2) forestry and grass cover is another important factor and is negatively correlated with water quality; (3) cropping land is not a major factor explaining the decline in water quality; (4) the 300 m buffer zone of the river is the strongest spatial scale for the LULC type to affect the Chemical Oxygen Demand (COD). Reasonable planning for the proportion of land types in the riparian zone and control over the development of urban land in the river basin is necessary for the improvement of the urban river water quality. Some studies have found that the relationship between LULC and water quality in the 100 m buffer zone is more significant than the whole basin scale. While our study is consistent with the results of research conducted by relevant scholars in Aibi Lake in Xinjiang, and Erhai and Fuxian Lakes in Yunnan. Thus, it may be inferred that for the plateau lake basin, the 300 m riparian buffer is the strongest spatial scale for the LULC type to affect COD.

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Section: Introductionmentioning

confidence: 99%

Multi-scale relationship between land use/land cover types and water quality in different pollution source areas in Fuxian Lake Basin

Li¹,

Peng

Jin

et al. 2019

PeerJ

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Spatial and temporal variability in water transparency in Yunnan Plateau lakes, China

et al. 2019

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Variation of chromophoric dissolved organic matter and possible attenuation depth of ultraviolet radiation in Yunnan Plateau lakes

Zhang

Liu

et al. 2007

Limnology

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The increase of ultraviolet radiation (UVR, 280-400 nm) caused by stratospheric ozone depletion has profound effects on aquatic ecosystems. High-altitude lakes in the Yunnan Plateau are exposed to high intensities of UVR and contain low concentrations of chromophoric dissolved organic matter (CDOM). Thirty-eight lakes in the Yunnan Plateau with elevations from 1291 to 3809 m above sea level were investigated to study CDOM concentrations and possible effects of UVR on the lake ecosystem. The attenuation of UVR in the Yunnan Plateau lakes was calculated from the absorption coeffi cient of CDOM based on an empirical relationship from lakes in the Alps and Pyrenees mountains. Absorption coeffi cients [a(λ)] at 320 nm [a(320)] ranged from 0.52 to 14.05 m −1 (mean ± standard deviation, 4.40 ± 3.85 m −1 ) and at 380 nm [a(380)] from 0.05 to 4.51 m −1 (1.40 ± 1.30 m −1 ). The exponential slope coeffi cient for the relationship of wavelength to a(λ) ranged from 16.2 to 41.4 µm −1 (21.74 ± 4.93 µm −1 ) over the 280-400 nm interval. Normalized fl uorescence emission (NFLU) at 450 nm from an excitation wavelength of 355 nm, F n (355), averaged 7.93 ± 3.22 NFLU. A signifi cant positive relationship was found between a(355) and F n (355). The estimated diffuse attenuation coeffi cients of UV-B (320 nm) and UV-A (380 nm) ranged from 0.55 to 15.77 m −1 and from 0.24 to 6.73 m −1 ; the corresponding 1% attenuation depths ranged from 0.29 to 8.44 m and from 0.68 to 19.12 m. Twenty-fi ve of 38 lakes had 1% UV-B attenuation depths of 1.5 m or more. The median 1% attenuation depth was 28.8% of the sampling depth for UV-B radiation and 60% for UV-A. In addition to CDOM, chlorophyll a (Chla) and total suspended matter (TSM) also may contribute to attenuation of UVR.

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Preliminary Studies on Eutrophication in Fuxian Lake

Cited by 13 publications

References 0 publications

Multi-scale relationship between land use/land cover types and water quality in different pollution source areas in Fuxian Lake Basin

Multi-scale relationship between land use/land cover types and water quality in different pollution source areas in Fuxian Lake Basin

Spatial and temporal variability in water transparency in Yunnan Plateau lakes, China

Variation of chromophoric dissolved organic matter and possible attenuation depth of ultraviolet radiation in Yunnan Plateau lakes

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