基于样地调查和森林资源数据的森林稳定性评价——以秭归县为例

Evaluation of Protection Forest Stability Based on The Data of Sample-Plots Survey and Forest Resources:A Case of Zigui County

森林稳定性是森林群落结构与功能的综合特征,是制定森林经营和管理方案的基础。本研究采用Delphi法从演替稳定性、抵抗力稳定性、恢复力稳定性、功能稳定性和环境稳定性等5个方面筛选出16个指标构成稳定性评价指标体系,利用秭归县9类不同森林类型157个样地调查数据确定指标权重,并基于森林资源调查数据,对区域森林稳定性进行了综合评价。结果表明:①建立的森林稳定性评价指标体系可以利用森林资源调查数据反映林分稳定性状态,值得推广;②秭归县有面积超过2/3的森林综合稳定性指数在0.4以上,仅约10%森林的综合稳定性指数低于0.3;③在各森林类型中,阔叶混交林平均稳定性指数最高,达到0.558,其后依次为针阔混交林、灌木林、针叶混交林、马尾松纯林、阔叶纯林、其他针叶纯林、经济林、柏木林,其综合稳定性分别为0.545,0.510,0.473,0.427,0.403,0.341,0.324,0.307。

Forest stability can comprehensively reflect the structural and functional characteristics of forest communities and is a foundation of formulating forest management project. A evaluation index sys- tem of the protection forest stability was established which consisted of 16 indices selected with Delphi method from 5 aspects, such as succession stability, resistance stability, resilience stability, function sta- bility, environmental stability. The weights of index were determined through calculating the proportion of each index standard deviation to sum standard deviation of all indices with the surveyed data of 157 samples plots in 9 forest types. Based on the forest resources survey data, the protection forest stability in Zigui county was evaluated. The results showed that ①The evaluation index system of forest stability es- tablished by this study can objectively reflect the protection forest stability with the forest resources sur- vey data, and is suitable for extending its application in forest community stability evaluations ;②Over two-thirds of protection forests in Zigui county had average stability degree index higher than 0.4, and a- bout 10 percent of protection forests owned average stability degree index lower than 0.3;③The average stability degree index of broadleaf mixed forest was the highest （0. 558） in all of forest types, followed by coniferous-deciduous mixed forest （0. 545）, shrubbery （0. 510）, coniferous mixed forest （0. 473）, Masson pine pure forest （0. 427）, broad--leaved pure forest （0. 403）, other coniferous pure forest （0. 341） and non-timber product forest （0. 324）, and cypress forest （0. 307） had the lowest stability degree index.