用微信扫码二维码

分享至好友和朋友圈

WE ARE COMMITTED TO REPORTING THE LATEST FORESTRY ACADEMIC ACHIEVEMENTS

四川康定力丘河流域景观格局变化及驱动力分析

Landscape pattern changes and driving force analyses of the Liqiu River Basin in Kangding City, Sichuan Province

  • 摘要: 力丘河是雅砻江中游重要支流,在区域社会经济发展和雅砻江水电建设背景下,开展力丘河流域景观格局研究,探讨流域景观变化驱动因素,对流域生态保护具有重要意义。基于流域2006年和2022年两时期景观分布数据,利用ArcGIS和Fragstats软件平台开展研究,结果表明:(1)灌丛、草地和森林是流域景观的主要成分,灌丛分布面积最大,森林平均斑块面积最大,草地斑块数量和密度最高;(2)2006~2022年研究区景观类型属性发生变化的斑块面积2390.06 hm2、占研究区的0.46%,森林、灌丛、草地、湿地等自然景观向城镇、农田人工景观转移,城镇景观面积增加2172.10 hm2、增幅166.01%;(3)灌丛、草地、其他和森林的斑块分散程度低、斑块邻接程度高,草地斑块混合度最高,湿地斑块的形状和边缘褶皱程度最复杂、斑块连接度最高,农田和城镇斑块的形状和边缘最简单,斑块离散程度较高;16年来流域景观斑块数量增加、平均斑块面积下降,同类斑块更加分散、混合度增加、功能性连接减弱,导致流域景观破碎度、均匀度和多样性均呈上升趋势;人类活动范围扩张和强度增加是流域景观变化的主要驱动因素。基于上述结果,提出合理控制、科学规划流域建设用地,减缓人类干扰扩张等措施,以维持力丘河流域的景观稳定。

     

    Abstract: Liqiu River is an important tributary of the middle reaches of the Yalong River. Against the backdrop of regional socio-economic development and Yalong River hydropower construction, conducting research on the landscape pattern changes and exploring its driving factors of Liqiu River basin is of great significance for ecological protection of the watershed. Based on the landscape distribution data of the Liqiu River basin in 2006 and 2022, a study was conducted using ArcGIS and Fragstats software platforms. The results showed that: (1) Shrubs, grasslands, and forests are the main components of the watershed landscape, with shrubs having the largest distribution area, forests having the largest average patch area, and grasslands having the highest patch number and density. (2) From 2006 to 2022, the area of patch attributes that changed in the research area was 2390.06 hm2, accounting for 0.46% of the research area. Natural landscapes such as forests, shrubs, grasslands, and wetlands were transferred to artificial landscapes such as urban lands and farmlands, and the area of urban lands increased by 2172.10 hm2, an increase of 166.01%. (3) The patches of shrubs, grasslands, unused lands, and forests have low dispersion and high adjacency. Grassland patches have the maximum mixedness. Wetland patches have the most complex shapes and edge folds, and the highest connectivity. The shape and edge of farmland and urban land patches are the simplest, and the patch dispersion degree is higher. In the past 16 years, the patch number in the watershed has increased while the average patch area has decreased. Patches of the same landscape type have become more dispersed, mixed, and functionally disconnected, resulting in an upward trend in the fragmentation, evenness, and diversity of the watershed landscape. The expansion and increase in intensity of human activities are the main driving factors for landscape changes in the watershed. Based on the above results, reasonable control and scientific planning of construction land, as well as measures to mitigate human interference and expansion, are proposed to maintain the landscape stability in the Liqiu River Basin.

     

/

返回文章
返回