基于最优格网的天水市景观脆弱性时空变化特征
Temporal and spatial variation characteristics of landscape vulnerability in Tianshui City based on optimal grid
毛子玄 1刘学录 1马彪 1李权玺 1罗莉2
作者信息
- 1. 甘肃农业大学资源与环境学院,甘肃 兰州 730070
- 2. 甘肃农业大学管理学院,甘肃 兰州 730070
- 折叠
摘要
科学评估高原与平原交错区域的景观脆弱性对区域生态调控具有重要意义.利用甘肃省天水市数期土地利用/覆盖(LUCC)数据,构建基于景观指数的脆弱性评估模型,探究最优格网下区域景观脆弱性的时空分布格局、地域差异性及景观脆弱性变化情况.结果表明,天水市景观脆弱性分析最佳格网 4 km×4 km;1990-2020年,天水市景观类型变化较为明显,主要景观类型以耕、林、草为主,建设用地面积增速最快,耕地面积转出较多,其他面积相互转换.景观脆弱性呈整体下降趋势,等级以较高、中等脆弱为主.脆弱等级面积转移以相邻等级为主,跨级转移较少,转移面积也较小.空间上呈显著的正相关性,局部空间自相关模式变化不大,空间分布稳定性较强.基于不同等级下的脆弱性特征,对天水市未来环境所存在的隐患及恢复生态环境的管理提出了对策建议.
Abstract
Scientific assessment of landscape vulnerability in intertwined region of plateau and plain is of great significance for regional ecological regulation.Based on land use/cover(LUCC)data of Tianshui City of several periods,a vulnerability assessment model based on landscape index was constructed to explore spatial and temporal distribution pattern,regional differences and changes of land-scape vulnerability under the optimal grid.Results showed that optimal grid for landscape vulnerability analysis in Tianshui City was 4 km×4 km.From 1990 to 2020,there were significant changes in landscape types in Tianshui City,with main landscape types being farmland,forest,and grass.Growth rate of construction land area was the fastest,with more farmland area transferred out,and the rest of area converted to each other.Overall trend of landscape vulnerability was decreasing,with higher and medium fragility being main levels.The area transfer of vulnerability level was mainly based on adjacent levels,with less cross level transfer and smaller trans-fer area.There was a significant positive correlation in space,with little change in local spatial autocorrelation patterns and strong stabil-ity in spatial distribution.Based on vulnerability characteristics at different levels,countermeasures and suggestions were proposed for management of potential environmental hazards and restoration of ecological environment in Tianshui City in the future.
关键词
尺度效应/景观格局/景观脆弱性/最优格网/天水市Key words
scale effect/landscape pattern/landscape vulnerability/optimal grid/Tianshui City引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据