Landscape ecological risk assessment of Yulin Region in Shaanxi Province of China
Landscape ecological risk assessment of Yulin Region in Shaanxi Province of China
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DOI：
10.1007/s12665-022-10636-x
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发表时间：
2022-10
影响因子：
2.8
通讯作者：
Bin Xu;Kaixi Ji;Bingyu Qi;Yucong Tao;Xiaohui Qi;Yan Zhang;Yan Liu
中科院分区：
文献类型：
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作者：
Bin Xu;Kaixi Ji;Bingyu Qi;Yucong Tao;Xiaohui Qi;Yan Zhang;Yan Liu
景观生态风险评价是研究景观与生态系统关系的基本内容。它可以揭示生态风险的时空异质性和尺度效应，提供多尺度风险的综合空间表征和可视化。榆林是我国北方典型的农牧交错带。土地利用/土地覆被变化频繁而剧烈，景观生态环境十分脆弱。利用ArcGIS分析了榆林市土地利用/土地覆被变化特征，采用4种景观评价指标对榆林市土地利用/土地覆被景观生态风险进行评价，探讨了榆林市土地利用/土地覆被景观生态风险的时空变化趋势及影响因素。结果表明，榆林市土地利用/覆被类型的绝对优势是草地和耕地。变化主要发生在草地、人工地表、耕地和裸地，变化幅度分别为-2.83%、1.85%、1.35%和-0.23%。高景观生态风险主要分布在榆阳和靖边部分地区。榆林地区大部分地区属于低、中、中等风险等级。景观生态风险的时间趋势没有统计学意义。草地、耕地和裸地的变化对景观破碎化的影响大于其他土地利用和土地覆盖类型。高和中/高风险等级主要覆盖毛乌素沙漠边缘归一化植被指数（NDVI）较低的区域（0.1-0.4）。景观生态风险与植被覆盖度的关系表明，从局部生境的角度来看，植被覆盖的范围、连续性、格局和类型是景观生态风险的影响因素。研究结果可为榆林及类似地区的植被恢复、土地利用规划和可持续发展提供参考。
Landscape ecological risk assessment is a basic content of studying the relationship between landscape and ecosystem. It can reveal the spatial–temporal heterogeneity and scale effects of ecological risks, and provide the comprehensive spatial characterization and visualization of multisource risks. Yulin is a typical agropastoral zone in the north of China. Land use and land cover (LULC) changes are frequent and intense, and the landscape ecological environment is very fragile. This study analyzed the change characteristics of land use and land cover of Yulin by ArcGIS, assessed the landscape ecological risks using 4 landscape metrics, and discussed the spatial–temporal trends and the influencing factors for the landscape ecological risk. The results show that the absolutely dominant land use and land cover types in Yulin are grassland and cultivated land. The changes mainly happened in grassland, artificial surface, cultivated land, and bare land, with the variation of − 2.83%, 1.85%, 1.35%, and − 0.23%, respectively. High landscape ecological risks are mainly distributed in Yuyang and part of Jingbian. Most part of Yulin region belongs to the risk grade of Low/Medium and Medium. No statistically significant temporal trends of landscape ecological risk is observed. Variation of grassland, cultivated land, and bare land has more impacts on the landscape fragmentation than other land use and land cover. Risk grades of High and Medium/High mainly cover the lower normalized difference vegetation index (NDVI) region (0.1–0.4) at the edge of the Mu Us desert. The relationship between the landscape ecological risk and the NDVI reveals that the extent, continuity, pattern, and the type of vegetation cover are influencing factors for the landscape ecological risk from the view of the local habitats. The study results may be helpful for the vegetation restoration, land use planning, and sustainable development of the Yulin and other similar regions.