承德市滦平县生态公益林质量评价

Evaluation the quality of ecological public welfare forest in Luanping county of Chengde

生态公益林对保持水土、保护生物多样性和经济社会可持续发展具有重要作用,其质量评价问题是当今林业研究的一个热点问题。文章以承德市滦平县生态公益林为研究对象,创建了一套生态公益林质量评价指标体系,利用高斯迭代法求取各评价指标的权重,采用模糊综合评判的方法以小班为研究单元对不同树种结构、群落结构、龄组和密度下的生态公益林进行质量评判,在此基础上应用Arcgis绘制相应的林分质量等级分布图。结果表明:该地区生态公益林林分质量总体较好,不同树种结构下一级公益林占滦平县公益林面积比重的74.33%;不同群落结构下一级公益林占滦平县公益林面积比重的67.39%;不同龄组一级公益林占滦平县公益林面积比重的57.49%;不同密度一级公益林占滦平县公益林面积比重的94.45%,面积占比均显著高于二级和三级公益林,且在分布上,二级和三级公益林破碎化程度较高。

Ecological forest has an important role in maintaining soil and water conservation, protecting biodiversity and sustainable development of economy and society. Its quality eval uation is a hot issue in the present forestry research. Taking ecological forest in Luanping county of Chengde as a research object, a set of index system for evaluating the quality of ec ological forest was created, and the weight of each evaluation index was obtained by Gauss iterative method. The method of fuzzy comprehensive evaluation is adopted to study the ecol ogy of different species structure, community structure, age group and density with small class as the research units. Base on this, Arcgis was used to map the distribution of forest stand quality grade. The results showed that the quality of the ecological forests in this area was generally good, and the one level of forest in different tree species accounted for 74. 33% of the forest in Luanping county. The one grade of forest in different community structures accourrted for 67.39% . The one grade of forest in different age groups accounted for 57. 49% ; one grade of different density forests accounted for 94.45%. The area occupation ratio was significantly higher than that of forest 2 and 3 level, and the fragmentation degree of dis tribution of forest 2 and 3 level was higher.