The Spatiotemporal Variation of Ecological Risk in the Lijiang River Basin Based on Land Use Change

The basic premise of regional ecological construction would be to scientifically and effectively grasp the characteristics of land use change and its impact on landscape ecological risk. The research objects of this paper are the typical areas of the Yellow River Basin in China and “process-change-drive” as the logical main line. Moreover, this paper is based on multi-period land use remote sensing data from 2000 to 2020, the regional land use change process and influencing factors are identified, the temporal and spatial evolution and response process of landscape ecological risk are discussed, and the land use zoning control strategy to reduce ecological risk is put forward. The results indicated: (1) The scale and structure of land use show the characteristics of “many-to-one” and “one-to-many”; (2) the process of land use change is affected by the alternation of multiple factors. The natural environment and socio-economic factors dominate in the early stage and the location and policy factors have a significant impact in the later stage; (3) the overall landscape ecological risk level and conversion rate show a trend of “high in the southeast, low in the northwest”, shift from low to high and landscape ecological risks gradually increase; and (4) in order to improve the regional ecological safety and according to the characteristics of landscape ecological risk and spatial heterogeneity, we should adopt the management and control zoning method and set different levels of control intensity (from key intensity to strict intensity to general intensity), and develop differentiated land use control strategies.

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Impacts of land use change on ecosystem service value in Lijiang River Basin, China

Environmental Science and Pollution Research ◽

10.1007/s11356-020-12190-0 ◽

2021 ◽

Author(s):

Ning Li ◽

Jinye Wang ◽

Haoyu Wang ◽

Bolin Fu ◽

Jianjun Chen ◽

...

Keyword(s):

Land Use ◽

Land Use Change ◽

River Basin ◽

Ecosystem Service ◽

Ecosystem Service Value ◽

Service Value ◽

Lijiang River

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Detection of land use change in the Laohahe River Basin of West Liaohe River based on remote-sensing images

Geo-information Science ◽

10.3724/sp.j.1047.2009.00125 ◽

2010 ◽

Vol 11 (1) ◽

pp. 125-131

Author(s):

Xiuqin FANG ◽

Liliang REN

Keyword(s):

Remote Sensing ◽

Land Use ◽

Land Use Change ◽

River Basin ◽

Remote Sensing Images ◽

Liaohe River

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Ecological and Environmental Effects of Estuarine Wetland Loss Using Keyhole and Landsat Data in Liao River Delta, China

Remote Sensing ◽

10.3390/rs13020311 ◽

2021 ◽

Vol 13 (2) ◽

pp. 311

Author(s):

Hongyan Yin ◽

Yuanman Hu ◽

Miao Liu ◽

Chunlin Li ◽

Jiujun Lv

Keyword(s):

Heavy Metal ◽

Land Use ◽

Land Use Change ◽

Ecological Risk ◽

Potential Ecological Risk ◽

Wetland Loss ◽

Ecological Effects ◽

Paddy Fields ◽

Suitable Habitat ◽

Estuarine Wetland

An estuarine wetland is an area of high ecological productivity and biodiversity, and it is also an anthropic activity hotspot area, which is of concern. The wetlands in estuarine areas have suffered declines, which have had remarkable ecological impacts. The land use changes, especially wetland loss, were studied based on Keyhole and Landsat images in the Liao River delta from 1962 to 2016. The dynamics of the ecosystem service values (ESVs), suitable habitat for birds, and soil heavy metal potential ecological risk were chosen to estimate the ecological effects with the benefit transfer method, synthetic overlaying method, and potential ecological risk index (RI) method, respectively. The driving factors of land use change and ecological effects were analyzed with redundancy analysis (RDA). The results showed that the built-up area increased from 95.98 km2 in 1962 to 591.49 km2 in 2016, and this large change was followed by changes in paddy fields (1351.30 to 1522.39 km2) and dry farmland (189.5 to 294.14 km2). The area of wetlands declined from 1823.16 km2 in 1962 to 1153.52 km2 in 2016, and this change was followed by a decrease in the water area (546.2 to 428.96 km2). The land use change was characterized by increasing built-up (516.25%), paddy fields (12.66%) and dry farmland (55.22%) areas and a decline in the wetland (36.73%) and water areas (21.47%) from 1962–2016. Wetlands decreased by 669.64 km2. The ESV values declined from 6.24 billion US$ to 4.46 billion US$ from 1962 to 2016, which means the ESVs were reduced by 19.26% due to wetlands being cultivated and the urbanization process. The area of suitable habitat for birds decreased by 1449.49 km2, or 61.42% of the total area available in 1962. Cd was the primary soil heavy metal pollutant based on its concentration, accumulation, and potential ecological risk contribution. The RDA showed that the driving factors of comprehensive ecological effects include wetland area, Cd and Cr concentration, river and oil well distributions. This study provides a comprehensive approach for estuarine wetland cultivation and scientific support for wetland conservation.

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Historic and Simulated Desert-Oasis Ecotone Changes in the Arid Tarim River Basin, China

Remote Sensing ◽

10.3390/rs13040647 ◽

2021 ◽

Vol 13 (4) ◽

pp. 647

Author(s):

Fan Sun ◽

Yi Wang ◽

Yaning Chen ◽

Yupeng Li ◽

Qifei Zhang ◽

...

Keyword(s):

Land Use ◽

Land Use Change ◽

Markov Model ◽

River Basin ◽

Arable Land ◽

Current Trend ◽

Ecological Crisis ◽

Tarim River ◽

Tarim River Basin ◽

Desert Oasis

The desert-oasis ecotone, as a crucial natural barrier, maintains the stability of oasis agricultural production and protects oasis habitat security. This paper investigates the dynamic evolution of the desert-oasis ecotone in the Tarim River Basin and predicts the near-future land-use change in the desert-oasis ecotone using the cellular automata–Markov (CA-Markov) model. Results indicate that the overall area of the desert-oasis ecotone shows a shrinking trend (from 67,642 km2 in 1990 to 46,613 km2 in 2015) and the land-use change within the desert-oasis ecotone is mainly manifested by the conversion of a large amount of forest and grass area into arable land. The increasing demand for arable land for groundwater has led to a decline in the groundwater level, which is an important reason for the habitat deterioration in the desert-oasis ecotone. The rising temperature and drought have further exacerbated this trend. Assuming the current trend in development without intervention, the CA-Markov model predicts that by 2030, there will be an additional 1566 km2 of arable land and a reduction of 1151 km2 in forested area and grassland within the desert-oasis ecotone, which will inevitably further weaken the ecological barrier role of the desert-oasis ecotone and trigger a growing ecological crisis.

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