森林景观恢复土地适宜性评价

Land suitability assessment for forest landscape restoration

为探究县域森林景观恢复机制,确定优先恢复区域与适宜恢复措施,以秭归县为研究对象,采用物元模型与多目标灰色局势决策模型,分别从景观和立地尺度开展森林景观恢复土地适宜性评价研究。在景观尺度,构建评价指标体系,确定森林景观恢复的优先恢复地块,制定重点恢复策略;在立地尺度,构建以提升区域水源涵养功能、生物量、生产力为核心的恢复措施,以实现生态系统服务在一定时空范围内达到最优配置。结果表明,秭归县适宜森林景观恢复地块总面积18674.06 hm^(2)。在3643.74 hm^(2)适宜新造林地块中,41.74%适宜恢复为针叶林,29.93%适宜恢复为针阔混交林,24.53%适宜恢复为阔叶林,3.80%适宜恢复为灌木林。15030.32 hm^(2)地块适宜提升森林质量,根据其林地类型,提出补植补造、促进林下植被生长、被动恢复、森林经营管理、单一树种改造、栽植混交林、封山育林等具体干预措施及其组合。物元模型与多目标灰色局势决策模型定量评估,结合研究区域土地利用现状、森林资源普查数据等基础数据,可有效确定优先恢复地块和恢复策略,为县域森林景观恢复提供定量评估方法。

In this study,we sought to examine county forest landscape restoration mechanisms,determine priority restoration areas and appropriate restoration measures,and provide a theoretical basis for county ecological restoration.Taking Zigui County as a typical case,we conducted an assessment of land suitability for forest landscape restoration at the landscape and stand scales.For landscape-scale assessments,we used a matter element model to determine the priority plots for forest landscape restoration and carried out targeted restoration.For stand-scale assessments,we used a gray situation decision-making mathematical model for multi-targets to construct a restoration strategy focused on improving the conservation function of regional water sources,biomass,and productivity,with the aim of achieving the optimal allocation of ecosystem services within certain spatial and temporal ranges.The results revealed that the area suitable of forest landscape restoration in Zigui County is 18674.06 hm^(2).Of this total,3643.74 hm^(2) land was found to be suitable for afforestation,of which,41.74%,29.93%,24.53%,and 3.80%was suitable for coniferous forest,coniferous and broad-leaved mixed forest,broad-leaved forest,and shrubbery,respectively.The remaining 15030.32 hm^(2) was assessed to be suitable for forest quality improvement in Zigui County.According to the type of forest,different specific interventions and combinations of replanting,reforestation,promotion of understory vegetation growth,passive restoration,forest management,single-species transformation,planting mixed forest,mountain closure,and afforestation were determined.Our findings in this study reveal that a quantitative matter element analysis method and the gray situation decision-making mathematical model for multi-targets,combined with the data of regional land use status,forest resource and other basic data,can be applied to effectively determine restoration strategies,and provide an effective quantitative method for assessing forest landscape restoration at the county scale.