Geological risk assessment for the rapid development area of the Erhai Basin

Liu, Yang; Wang, Zhanqi; Gui, Jin; Chen, Dongdong; Wang, Zhan

doi:10.1016/j.pce.2015.10.012

Cited by 8 publications

(4 citation statements)

References 35 publications

(25 reference statements)

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“…Erhai Lake (one of the lakes inside this area), located in the central part of the EHW, is the second-largest freshwater lake [20], and is known as a The study area includes the city of Dali and parts of the city Eryuan in Dali Bai Autonomous Prefecture, Yunnan Province. The EHW is situated in the watershed belt of the Jinsha River, Red River, and Lancang River [3] and is surrounded by mountain chains (the Hengduan range). The natural landscape is the dominant background throughout the EHW, and manual or semiartificial landscapes are embedded in the area [5].…”

Section: Study Areamentioning

confidence: 99%

“…The western side of Erhai Lake is adjacent to the steep Cang Mountains, which rise to more than 2000 m above the lake surface [21]. The EHW is subjected to a subtropical plateau monsoon climate [3], and the climate and landscapes are vertically distributed. The EHW is considered a special area with tremendous biodiversity and landscape diversity.…”

Section: Study Areamentioning

confidence: 99%

“…As a typical cloudy mountainous region in China, the Erhai watershed (EHW) in northwestern Yunnan is located in a low-latitude, high-altitude belt [3,4]. In this area, complex topography forms steep environmental gradients that generate climatic differences and landscape diversity.…”

Section: Introductionmentioning

confidence: 99%

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Characterizing the Long-Term Landscape Dynamics of a Typical Cloudy Mountainous Area in Northwest Yunnan, China

Chen

Zhang

et al. 2022

Sustainability

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Detailed knowledge of landscape dynamics is crucial for many applications, from resource management to ecosystem service assessments. However, identifying the spatial distribution of the landscape using optical remote sensing techniques is difficult in mountainous areas, primarily due to cloud cover and topographic relief. Our study uses stable classification samples from mountainous areas to investigate an integrated approach that addresses large volumes of cloud-cover data (with associated data gaps) and extracts landscape time series (LTS) with a high time–frequency resolution. We applied this approach to map LTS in a typical cloudy mountainous area (Erhai watershed in northwestern Yunnan, China) using dense Landsat stacks, and then we also used the classified results to investigate the spatial–temporal landscape changes in the study area at biennial intervals. The overall accuracy of the landscape classification ranged from 81.75% to 88.18%. The results showed highly dynamic processes in the landscape throughout the study period. Forest was the main land cover type, covering approximately 39.19% to 41.68% of the total study area. Alpine meadow showed fluctuating trends, with a net loss of 11.22% and an annual reduction rate of −0.4%. Shrub cover increased by 1.26%, and water bodies showed a small decrease in area, resulting in an overall net change of −0.03%. Built-up land and farmland areas continued to expand, and their annual growth rates were 1.52% and 1.06%, respectively. Bare land showed the highest loss, with a net change of 228.97 km2. In the Erhai watershed, all the landscape classes changed or transitioned into other classes, and a substantial decrease in bare land occurred. The biennial LTS maps allow us to fully understand the spatially and temporally complex change processes occurring in landscape classes; these changes would not be observable at coarse temporal intervals (e.g., 5–10 years). Our study highlights the importance of increasing the temporal resolution in landscape change studies to support sustainable land resource management strategies and integrate landscape planning for environmental conservation.

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Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

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Characterizing the Long-Term Landscape Dynamics of a Typical Cloudy Mountainous Area in Northwest Yunnan, China

Chen

Zhang

et al. 2022

Sustainability

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“…Soils with higher CEC and clay fraction have higher P retention and water-holding capacity and thus subject less nutrient to leaching [25]. In soils in regions to the west of Erhai lake, nutrients are more likely to be lost through surface runoff and leaching, because soils in these regions contain low clay and CEC, and the agricultural land is mostly of low-slope in the west of the Erhai basin [26]. Therefore, for these soils it is recommended that fertilization be managed to reduce pollution potential.…”

Section: Strategies To Reduce Excessive Fertilization and High Levelsmentioning

confidence: 99%

Current Fertilization Practice and Phosphorus Loading from Soils near Alpine Lakes of Yunnan Province, China

Zou¹,

Falinski²,

Pei-fei³

et al. 2019

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Phosphorus loss from fertilization is a significant source of pollution to freshwater lakes worldwide. Production of flowers, vegetables, staple food and vineyard in regions surrounding Dianchi, Erhai, Fuxian and Xingyun lakes in Yunnan Province is large-scale. Previous studies have shown that annual fertilizer application rates (AFARs) were excessive in these regions. Significant amount of arable land near lakes has been used to build recreational parks with plants that receive less fertilization to reduce P loading. To answer whether rAFARs were associated with specific crops, AFARs of specific land uses were investigated through interviews. To estimate P loading, NaHCO 3 -P and NaOH-P concentrations were measured in 753 soil samples of selected layers (0 -5, 5 -20, 20 -40 cm) in regions surrounding these lakes. Soil texture, pH, and cation exchange capacity (CEC) were analyzed to characterize soils. P loading was high ranging from 999 to 2094 mg P/kg as measured by NaOH-P, and levels of NaHCO 3 -P from 18.6 to 92.2 mg P/kg. AFARs to flower (4745 kg/ha), and vegetable (2967 kg/ha) were higher than those applied to staple food (945 kg/ha), and plants in recreation parks (200 kg/ha). The highest NaHCO 3 -P and NaOH-P concentrations in selected layers were associated with production of flowers, vegetables, and grapes. Although all layers of soils that were used for recreation parks in regions near Dianchi lake contained lower NaHCO 3 -P, NaOH-P was almost as high as with soils cultivated with flowers probably reflecting historical additions or differences in How to cite this paper: 1 Agricultural Sciences L. Zou et al.soil type. Here we show for the first time in local regions that the production of flowers, grapes and vegetables was a critical source contributing to the buildup of both readily available (NaHCO 3 -P) and reversibly available P (NaOH-P). Build-up of recreational parks with plants that receive less fertilization would be a long-term remediation to reduce P loading of soils in regions near Dianchi lake.

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Perception of Risk and Sustainability: Concept Analysis of Environmental Justice and Sustainable Development in Geological–Geotechnical Risk Assessment Approaches

2019

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Geological risk assessment for the rapid development area of the Erhai Basin

Cited by 8 publications

References 35 publications

Characterizing the Long-Term Landscape Dynamics of a Typical Cloudy Mountainous Area in Northwest Yunnan, China

Characterizing the Long-Term Landscape Dynamics of a Typical Cloudy Mountainous Area in Northwest Yunnan, China

Current Fertilization Practice and Phosphorus Loading from Soils near Alpine Lakes of Yunnan Province, China

Perception of Risk and Sustainability: Concept Analysis of Environmental Justice and Sustainable Development in Geological–Geotechnical Risk Assessment Approaches

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