Wang Bin,Mei Zhixiong,Wei Junchao,et al.Spatiotemporal Characteristics of Land-Use Ecological Risk in the Pearl River Delta Region Based on Spatial Statistics[J].Research of Soil and Water Conservation,2023,30(06):423-431,440.[doi:10.13869/j.cnki.rswc.2023.06.029]
基于空间统计的珠三角地区土地利用生态风险时空特征
- Title:
- Spatiotemporal Characteristics of Land-Use Ecological Risk in the Pearl River Delta Region Based on Spatial Statistics
- 文章编号:
- 1005-3409(2023)06-0423-09
- 分类号:
- X826
- 文献标志码:
- A
- 摘要:
- [目的]揭示珠三角地区土地利用生态风险的空间结构模式和时空变化规律,为促进土地资源可持续利用和保障区域生态安全提供参考依据。[方法]基于景观指数构建土地利用生态风险评价模型,测算2000年、2010年、2020年珠三角地区多种尺度下的土地利用生态风险,利用半变异函数确定最适宜的研究尺度,运用空间自相关和GIS空间分析方法分析了适宜尺度下土地利用生态风险的时空特征。[结果](1)3 km样方尺度是最佳研究尺度,小流域尺度也较合适; 两个尺度下土地利用生态风险空间变异均以结构性因素影响为主,即存在较强的空间自相关性。(2)研究区土地利用生态风险总体上具较强的正空间集聚特征,但集聚程度趋于减弱; 大多单元局部空间集聚特征相对稳定,以高—高集聚和低—低集聚为主,低—高和高—低集聚区零星分布且变化不大。(3)区域土地利用生态风险总体呈略微下降趋势,以低风险和较低风险等级区为主且面积逐渐增加,中风险等级以上面积减小。[结论]珠三角地区土地利用生态风险整体上呈现正空间集聚特征,且土地利用生态风险水平逐渐降低,研究结果可为区域国土空间优化利用和生态风险管控提供决策参考。
- Abstract:
- [Objective] The aim of this study is to explore the spatial structure pattern and spatial-temporal change rule of land use ecological risk in the Pearl River Delta(PRD)region, and then to provide scientific support for the sustainable utilization of land resources and ecological security. [Methods] A land-use ecological risk assessment model was constructed with landscape metrics, and land-use ecological risk indexes at multiple scales in the Pearl River Delta in 2000, 2010 and 2020 were measured by this model. Then, the semi-variogram, spatial autocorrelation and GIS spatial analysis methods were used to determine appropriate research scales and explore the spatiotemporal characteristics of land-use ecological risk at these scales. [Results](1)The 3 km quadratic scale was the best research scale, and the small watershed scale was also appropriate. At both scales, the spatial variability of land-use ecological risk from 2000 to 2010 was mainly influenced by structural factors, i.e., there was a strong spatial autocorrelation.(2)The land-use ecological risk in the study area generally had strong positive spatial agglomeration characteristics, but the degree of agglomeration trended to weaken. The local spatial agglomeration characteristics of most units were relatively stable. The distribution of high-high agglomeration and low-low agglomeration areas were obvious, and the distribution of low-high agglomeration and high-low agglomeration areas were sporadic and did not change much.(3)The degree of land-use ecological risk had gradually decreased. Low-risk level and lower-risk level were dominant risks and the distribution areas were increasing, while the areas above medium-risk level were decreasing. [Conclusion] The overall land use ecological risk in the PRD region showed positive spatial clustering characteristics, and the level of land use ecological risk gradually decreased, and the results of this study can provide decision-making reference for the optimal use of regional land space and ecological risk control.
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备注/Memo
收稿日期:2022-10-25 修回日期:2022-11-10
资助项目:国家自然科学基金“珠三角城市群的城市空间集聚时空分析与预测及空间优化决策”(41001078)
第一作者:王彬(1998—),女(壮族),广西南宁人,硕士生,研究方向为土地利用生态风险评价。E-mail:wangbinbin_711@163.com
通信作者:梅志雄(1976—),男,湖北黄梅人,博士,教授,主要从事空间分析与建模、土地利用模拟与优化研究。E-mail:zhixiongmei76@126.com