夷陵地区异质景观对松材线虫病的抵抗力及生态风险分析

以宜昌市夷陵地区为研究区域, 探讨在疫区通过异质性的景观控制松材线虫病扩散流行的方法及当前疫区的生态风险。结合景观生态学和森林保护学理论, 基于松材线虫病生物学特征和现有土地利用类型, 经过重分类, 构建了夷陵区景观格局, 并以景观格局指数为评价指标, 通过空间分析和克里金插值法对夷陵区生态风险进行评价。结果表明, 研究区异质性景观对松材线虫病的相对抵抗力从大到小依次为水域及水利设施景观、人为活动景观、其他林园地景观和耕地景观, 马尾松等针叶林景观最弱。风险评价结果表明夷陵区中部, 沿长江流域带生态风险值较高。预防策略上应通过景观格局的合理配置, 优化土地利用现状、合理规划利用, 采取重点生态保护措施和综合治理对策控制松材线虫病的扩散。

The heterogeneous landscape resistance to pine wild disease and ecological risk assessment in YiLing

We studied the method of controlling pine wild disease dispesal with heterogeneous landscape and assessed the epidemic area ecological risk in Yiling using the landscape ecology with forest protection theories,based on the biological characteristics of pine wild disease and current situation of land use.We reclassified the typies,constructed the landscape pattern,used landscape index as the assessment criteria by spatial analysis and Kriging interpolation methods to assess the Yiling district ecological risk.The results showed that the resistance to pine wild disease of heterogeneous types from maximum to minimum was water and conference facilities area,residential area,other forestry and garden area and agriculture area;coniferous area was the smallest.The ecological risk assessment showed central region of Yiling district and the Yangtze River had a high risk possibility.The prevention strategy should focus on reasonable configutation of landscape pattern,and rational land using current situation,and adopt ecological protection and management strategy to control the dispersal of pine wild disease.