基于LFA方法的重庆园博园植被景观功能评价研究

Evaluation of Vegetation Landscape Function in Chongqing Garden Expo Based on LFA

采用LFA(landscape function analysis)方法对重庆园博园植被景观进行景观功能评价,以期在水土保持的基础上为重庆山地公园植被景观规划设计提供参考。评价指标有:斑块面积指标、景观结构指标、土壤结构稳定性指标、入渗指标、养分循环指标、景观功能值。具体以植被景观的景观结构特征与地表土壤特征为评价基础,再通过加权求和计算景观功能值进行评价。结果认为:通过不同植被配置类型对植被斑块景观结构特征评价结果与地表土壤特征评价结果的均值比较,景观功能值表现出乔灌地被>乔地被>乔灌>灌地被>草坪;景观结构指标对地表土壤特征评价指标的相关性强于斑块面积指标,因此,在山地公园植物景观的规划设计过程中,当植被斑块面积确定,植被斑块的长边应与坡度方向一致;在评价过程中,可运用植被斑块面积指标与景观结构指标对植被景观水土保持功能进行粗略预测,即在水土保持基础上的植被景观设计,可通过规划设计植被配置斑块的景观结构特征来保证植被景观的水土保持功能。

The function of the vegetation landscape in the Chongqing Garden Expo was evaluated by LFA（ landscape function analysis） methods to provide the reference for the vegetation landscape planning and design in mountain park based on the soil and water conservation. The evaluation indexes included patch area,landscape structure,soil structure stability,infiltration,nutrient cycle and landscape function value. Based on the characteristics of landscape structure and surface soil,the function value was evaluated by weighted sum. The results showed that the average values of landscape structure characteristics and surface soil characteristics evaluated by different types of vegetation configurations presented the arbor and shrub coverthe arbor coverthe arbor and shrub the shrub cover the lawn,that the long sides of the vegetation patches should be consistent with slope direction in the plant landscape design when vegetation patch area was determined since the correlation of landscape structure index was stronger than that of patch area in the correlation analysis of surface soil characteristics evaluation indexes,that the planning for the landscape structure feature of vegetation configuration could conserve the soil and water conservation function which was predicated roughly by vegetation patch area index and landscape structure index.