Ecological risk assessment of the Gannan Plateau, northeastern Tibetan Plateau

Yue, Dongxia; Zeng, Jianbin; Yang, Chao; Zou, Mingliang; Kai, Li; Chen, Guanguang; Guo, Jianjun; Xiang, Xu; Meng, Xingmin

doi:10.1007/s11629-017-4466-0

Cited by 20 publications

(8 citation statements)

References 19 publications

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“…Methodically, landscape metrics can be used to assess ecological risk because landscape spatial patterns and external effects interact during ecological processes. In accordance with previous studies [24,27,32,33,35,36,[38][39][40][41]44,45], the combination of the landscape disturbance index (E i ) and landscape vulnerability index (F i ) is usually chosen to represent landscape loss upon impacts of external interference.…”

Section: Construction Of An Lera Modelmentioning

confidence: 99%

“…However, previous studies nearly always focused on provincial and municipal scales (see, for example, Refs. [5,32,[38][39][40][41]), leading to the absence of adequate environmental protection awareness within the planning process of counties and townships. Filling this gap is by all means meaningful and necessary because human impacts on the ecosystem are first accumulated and realized in small-scale areas.…”

Section: Introductionmentioning

confidence: 99%

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Assessing Landscape Ecological Risk Induced by Land-Use/Cover Change in a County in China: A GIS- and Landscape-Metric-Based Approach

2020

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Landscape ecological risk assessment (LERA) evaluates different types of potential environmental impacts and their cumulative effects, thereby providing policy insights for sustainable regional land-use and ecosystem management. In a departure from existing literature that heavily relies on low-resolution land-use data for LERA at provincial or municipal scales, this study applies high-resolution land-use data to a relatively small research area (county). In addition, this study modifies the evaluation units of LERA from equal-sized grids to watersheds and refines the ecological vulnerability weight on the basis of finer-resolution data. The main findings are summarized as follows: (1) In 2011–2013, nearly 866 ha of land use in Xiapu County changed; moreover, the construction land, which was mainly concentrated in Songgang Street and Xinan Town, increased the most (340 ha). (2) Landscape ecological risk (LER) was roughly maintained, and areas of high ecological risk were mainly concentrated along the coast. (3) The spatial distribution of LER maintained a relatively aggregated pattern, with no trend toward more aggregated or more dispersed change. This study further discusses the relationship between local LER and land-use change and how to balance global and local LER in planning practices.

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Section: Construction Of An Lera Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessing Landscape Ecological Risk Induced by Land-Use/Cover Change in a County in China: A GIS- and Landscape-Metric-Based Approach

2020

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“…In Maqu County, where the natural environment is poor, excessive development must be prohibited to reduce human interference. As the recharge water volume of Maqu County accounts for 45% of the total flow of the Yellow River [ 38 ], nine provinces along the middle and lower Yellow River in China will be severely affected if the landscape ecological risks of Maqu County further rise. (2) The lowest and lower risk regions should emphasize protecting the original landscape.…”

Section: Discussionmentioning

confidence: 99%

Spatio-Temporal Characteristics of Landscape Ecological Risks in the Ecological Functional Zone of the Upper Yellow River, China

Qiao

Bai

Xie

et al. 2021

IJERPH

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The Ecological Functional Zone of the Upper Yellow River (EFZUYR) is a critical water-catching area in the Yellow River Basin, the ecological security of which affects the sound development of the ecosystem in the entire basin. Recently, significant land use changes have aggravated regional ecological risks and seriously affected the sustainable development of EFZUYR. In this context, this paper provides an in-depth study of the ecological risks caused by land use landscape changes. With the help of land use data and dynamic degree analysis, the land use transfer matrix, and the landscape pattern index, this paper quantifies the distribution trends of land use landscape patterns in EFZUYR from 1990 to 2018. In addition, this research explores the temporal and spatial dynamic distribution characteristics of landscape ecological risks in this functional zone. The research results show the following: (1) The transfer of land use in EFZUYR from 1990 to 2018 mainly occurred among cultivated land, grassland, and woodland, with the transferred area accounting for 87.16% of the total changed area. (2) The fragmentation degree of built-up areas is 0.1097, 0.1053, 0.0811 and 0.0762 in 1990, 2000, 2010 and 2018, respectively, with a decreasing trend. The dominance degree of grassland has been maintained at the highest level for a long time, with all values above 0.59. The separation degree and the interference degree of built-up areas were the highest and the values of the four periods were above 1.2 and 0.44, respectively. The loss degree of water was the highest, with a value above 0.67, while the value of other land use was mostly below 0.4. (3) The landscape ecological risk of EFZUYR presented a fluctuating rising, falling, and then rising trend. The spatial distribution characteristic of EFZUYR presented “high in the north and south, low in the middle.”, which has been maintained for a long time. The proportion of low-risk areas is as high as 70%, and the overall ecological risk of the region was low. However, the ecological risk of some areas, such as Linxia City and Magu County, increased. These findings can provide theoretical support for land use planning and achieving sustainable development of EFZUYR.

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“…The Gannan Plateau is located in the eastern margin of the Qinghai‐Tibet Plateau and southern part of Gansu Province of China, and the trunk of the Yellow (Huanghe) River is greatly supplied by the Gannan Plateau (Yue et al, 2018). However, due to the climate change and human impacts in recent years, the wetland area and water conservation capacity have decreased, threatening the reginal water budget and sustainability (Liu et al, 2020; Wang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Below‐cloud evaporation effect on stable water isotopes in precipitation at the eastern margin of Qinghai‐Tibet Plateau

Chen

Wang

et al. 2022

Hydrological Processes

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Quantitatively assessing the evaporation‐caused stable water isotope fractionation in precipitation below the cloud base is of great significance to understand the modern hydrological circulation especially in a plateau climate. Based on the hourly meteorological data at eight meteorological stations of the Gannan Plateau at the eastern margin of Qinghai‐Tibet Plateau in 2020, we examined the spatial and temporal variations of below‐cloud evaporation effect on precipitation isotopes, and then discussed the factors influencing the below‐cloud evaporation across the Gannan Plateau. The contemporary observation of precipitation isotopes at one site in the Gannan Plateau is also applied to understand the local meteoric water line associated with the below‐cloud evaporation. From 9:00 to 21:00 Beijing Time, the impact of below‐cloud evaporation is greater than that during the rest periods. Within the study region, the below‐cloud evaporation in the central area is usually stronger than that of the surrounding area. The diurnal and monthly variability of relative humidity is highly consistent with that of the remaining raindrop mass fraction after evaporation as well as the isotope variation in raindrop below the cloud base. When the relative humidity is greater than 95%, there is a linear relationship between the remaining raindrop mass fraction and the below‐cloud deuterium‐excess variation of approximate 1.1‰/%. Global warming will increase the below‐cloud evaporation effect across the Gannan Plateau. The findings are useful to understand the below‐cloud evaporation and isotope fractionation under a plateau climate.

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Ecological risk assessment of the Gannan Plateau, northeastern Tibetan Plateau

Cited by 20 publications

References 19 publications

Assessing Landscape Ecological Risk Induced by Land-Use/Cover Change in a County in China: A GIS- and Landscape-Metric-Based Approach

Assessing Landscape Ecological Risk Induced by Land-Use/Cover Change in a County in China: A GIS- and Landscape-Metric-Based Approach

Spatio-Temporal Characteristics of Landscape Ecological Risks in the Ecological Functional Zone of the Upper Yellow River, China

Below‐cloud evaporation effect on stable water isotopes in precipitation at the eastern margin of Qinghai‐Tibet Plateau

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