基于综合效益评价的石首市抑螺防病林配置模式选择

Configuration Model of Snail Control and Schistosomiasis Prevention Forest Based on Comprehensive Benefit Evaluation in Shishou City

在对湖北石首市抑螺防病林立地类型及配置模式进行调查与分类的基础上,将石首市抑螺防病林划分为5种立地类型和36种配置模式,应用层次分析法进行了抑螺防病林配置模式综合效益评价与选择。结果表明:综合效益、生态效益及抑螺效益较高的防病林模式均为杨树林配置,且其综合效益与林分密度呈现正相关,景观效益较高的配置模式兼有杨树纯林和景观树种,而经济效益较高则为杨树林下养殖模式;不同立地类型中综合效益较高的配置模式均为高密度杨树纯林模式,其次为杨树林下养殖模式。为提升石首市及其相似地区抑螺防病林的综合效益,在立地条件较好的潮土、黄棕壤地段,防病林的配置均宜选用高密度的杨树林模式。在成片杨树林中采用林下养殖模式提升经济效益,在村湾及道路沟渠旁则可通过景观树种配置提升景观效益,在土壤较瘠薄的黄壤地段应选择耐瘠薄树种营造抑螺防病林。

This paper used the AHP method to evaluate the comprehensive benefits and select the better configuration model of snail control and schistosomiasis prevention forest based on investigating and classifying the site types and the configuration models of snail control and schistosomiasis prevention forest in Shishou City. The results showed that the snail control and schistosomiasis prevention forests of Shiyou City could be divided into five kinds of site types and 36 kinds of configuration patterns. The model with high comprehensive benefits,ecological benefits and snail prevention benefit was poplar configuration,and the comprehensive benefits were positively correlated with the stand density. The models with high landscaping benefits were the forest with pure poplar or landscape trees or both of them. The poplar forest with under-forest farming model had high economic benefits. The high-density poplar pure forest was the most comprehensively distributed configuration model in different site types,followed by poplar underforest farming model. The high-density poplar forest should be selected in the areas with good soil condition and yellow brown soil to improve the comprehensive benefits of snail control and disease prevention forest in Shishou City and the other similar areas. The under-forest farming model was used in the poplar forest to improve economic efficiency,the landscape trees were planted on the roadside and ditch of the village to increase landscaping benefits,and the barren tree species was selected to create snail control and schistosomiasis prevention forest in barren yellow soil area.