| 摘要: |
| ［目的］利用2000年、2005年、2010年、2015年广西轻度及以上石漠化的69个区/县土地利用数据，分析其土地利用时空变化特点，揭示其变化对该区域土地生态风险的影响。［方法］基于GIS支持，采用土地利用动态变化度、土地转移流、土地生态风险指数（RSI）等对研究区土地生态风险的异质性特征进行定量分析。［结果］（1）2000—2015年广西石漠化地区土地利用动态度呈逐渐增大趋势，土地利用动态度变化，反映出研究区土地利用变化较频繁。（2）耕地、林地、草地、建设用地4类用地转移的数量与方向决定着广西石漠化地区土地利用变化的特征。（3）2000—2015年广西石漠化各区/县土地生态风险程度略微增大，南部的贵港、南宁是生态重警区，研究区的土地生态安全有待进一步改善。（4）土地生态风险指数与土地利用类型变化的活跃程度呈正相关。［结论］研究区未来土地利用，应进一步优化土地资源配置，加强生态环境保护，提高土地利用综合效益。 |
| 关键词: 石漠化土地利用时空变化生态风险广西 |
| DOI： |
| 分类号:F3022 |
| 基金项目:国家自然科学基金项目“城市化背景下河湖水系连通的时空变化及其洪涝响应研究”（41601039）； 国家社会科学基金“基于生态文明视角的西南贫困地区村落演变与空间优化模式研究”（15BJL110）； 广西自然科学基金“漓江流域下垫面变化对不同重现期暴雨洪水的影响研究”（2017GXNSFAA198012）； 广西自然科学基金“基于水足迹评价的桂西地区水资源合理配置研究”（2015GXNSFBA139186）； 广西高校重点实验室研究基金“广西石漠化地区土地利用/覆被变化与生态优化调控研究”（YRHJ16Z016）； 广西高校青年项目“少数民族地区多维贫困测度与减贫模式研究——以广西为例”（2018KY0059） |
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| ECOLOGICAL RISKS CAUSED BY LAND USE VARIATIONS IN THE ROCKY DESERTIFICATION MOUNTAINOUS AREA IN GUANGXI PROVINCE |
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Xie Ling1,2,3, Deng Xiaojun4, Lu Yueyan1, Yan Tuqiang1, Li Xiaokun5※
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1.School of Environment and Resources, Guangxi Normal University, Guilin，Guangxi 541004, China;2.Key Laboratory of Karst Ecology and Environmental Change of Guangxi Province, Guangxi Normal University, Guilin, Guangxi 541004, China;3. College of Resources and Environment Science, Xinjiang University, Urumqi, Xinjiang 830046, China; 4. School of Economics, Zhejiang University of Finance & Economics, Hangzhou, Zhejiang 310018,China;5.Chongqing Academy of Science &Technology, Chongqing 401331, China
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| Abstract: |
| By using land data in year 2000, 2005, 2010, 2015 of the 69 districts/counties containing light to severe rocky desertification in Guangxi province, this research aims to analyze the spatiotemporal variation of land use change and reveal the relationship between land use change and the evolution of land ecological environment. With the support of GIS, this research made a quantitative analysis of the temporal and spatial characteristic of land use ecological risk by adopting the criteria of land use dynamic change, the flow of land use change and the ecological risk index (ERI). The results were showed as follows. Firstly, the dynamic degree of land use in rocky desertification area of Guangxi had increased slightly from 2000 to 2015, showing land use changes frequently. Secondly, magnitude and direction of transformation among cultivated land, forest land, grass land and construction land were the controlling factors which determined the characteristics of land use change in those areas. Thirdly, the degree of ecological risk had gradually increased from 2000 to 2015, among those areas Nanning was ecological serious warning area. And the land ecological security needed to be further improved in the study area. Finally, the ecological risk index of land was positively correlated with the activity level of land use change. In summary, this research provides insight to the allocation of land resources and scientific guidelines to the environmental protection in the rocky desertification area, strengthen the protection of ecological environment and improve the comprehensive benefit of land use. |
| Key words: rocky desertification land use spatial variation ecological security Guangxi province |
