Landscape Ecological Risk Assessment during 2000–2020 Based on Land Use and Land Cover Changes in Lanzhou City

Abstract

A landscape ecological risk model was constructed to evaluate the landscape ecological risk pertaining to Lanzhou City based on the land use and land cover (LULC) changes obtained using remote sensing data for the years 2000 covering the duration 2010 show that during 2010-2020, the LULC types in Lanzhou City mainly comprised of cropland, grassland, and construction land. In terms of LULC changes in Lanzhou City the trend shows a decrease in cropland and increase in construction land with an increase in the fragmentation and separation of cropland, grassland, and shrubland, which is pronounced for cropland and shrubland. The spatial distribution pattern of ecological risk shows very high and very low levels of risk in the main urban area in the south and in the northwest of the city, respectively. From 2010 to 2020, the ecological risk level of the landscape shows a gradual increase with evidence for significant changes. The results of the study provide a scientific basis for the optimization of the landscape pattern, rational utilization and development of land resources in Lanzhou City, and lay a solid foundation for the formulation of ecological risk control measures.

Remote Sensing Inversion of Aboveground Biomass of Grassland in Lanzhou City Based on Machine Learning Algorithm

“…The topography of Lanzhou City is high in the west and south and low in the northeast, with the Yellow River flowing from southwest to northeast. It has a temperate continental climate with an average annual temperature of 9.8°C, an average annual precipitation of about 327 mm, mainly concentrated in June-September, and a potential annual evaporation of 1437.7 mm [27][28]. Lanzhou City is rich in water resources, the region has the Yellow River as well as the Yellow River's first-class tributaries Huangshui, Zhuanglang River and second-class tributaries Datong River and other important water source culverts [29].…”