武汉环城林带质量评价及影响因素分析

Quality Evaluation and Analysis on Factors Affecting the Quality of the Forest Belt Around Wuhan City

从景观质量、生长质量和稳定性上构建了环城林带质量评价的指标体系,并通过基于层次分析法和熵值法的综合权重确定了指标权重,在林带小班调查数据的基础上对武汉市环城林带质量进行评价。结果表明,基于层次分析法和熵值法的综合权重更好地平衡了评价指标的客观信息和评价者的主观意志。准则层中景观质量所占权重最高,季相多样性、树种混交状况和灌木层盖度是反映林带综合质量的关键指标。武汉市环城林带的生长质量和稳定性较高,景观质量较差,林带的质量仍具有极大的提升空间。林分密度过高、树种混交度低、季相变化不明显,林下灌草层盖度不高是影响武汉市环城林带质量的主要因素。以林带景观质量提升为重点,加强针叶林和常绿阔叶林的林分改造,提高树种混交度及灌草层盖度,增加林分的季相变化及结构完整性,合理地调整林分密度是提升林带质量的主要途径。

Based on the landscape quality,growth quality and stability,the indicator system of the quality evaluation of the eco-landscape forest belt around the city was constructed.The weights of the factors and indicators were determined by the comprehensive weights based on the analytic hierarchy process and the entropy method to evaluate the quality of the shelterbelt.The study results are as follows:the comprehensive weighting based on analytic hierarchy process and the entropy method better balanced the objective information of the evaluation indicators and the subjective will of the evaluators.Landscape quality has the highest weight in the criteria layer.Seasonal aspect diversity,tree mixed status and shrub layer coverage are the key indicators reflecting the comprehensive quality of the shelterbelt.Growth quality and stability of the shelterbelt is relatively high,while landscape quality is low,so the quality of the shelterbelt still has a great room for improvement.The mixed degree of tree species is not good,the seasonal variation is not obvious,and the coverage of understory shrubs is not high,which is the main factor affecting the quality of the forest belt around a city.Focusing on the quality improvement of shelterbelt landscape,improving the stand of coniferous forest and evergreen broad-leaved forest,increasing the mixed degree of tree species,the seasonal variation and structural integrity of the stand,and adjusting the stand density reasonably,promoting the growth of understory shrubs and improving the biodiversity of forest belts in the process of protection are the main ways to improve the quality of the forest belt around a city.