Evaluation On Ecological And Economic Benefit Of The Return Farmy And To Forest Or Grasses In Yan'an

Yan'an was the focus of the Model Forest project area, the National Forest project is an integral part of ecological construction and effect of significant areas. In this study, the process of returning farmland to forests, different modes: ecological forest, grass, animal husbandry, forestry medicine, Forest four models and the control object of study, through surveys and analysis, establish a scientific evaluation system using the gray relational grade methods on various models of ecological, economic, research, and evaluation. Follow the development and thus played a positive role in promoting and recommendations.1 An eco-forest model: allocation can be divided into tree type, shrub, shrubs and combined type, tree type; oriental is Chinese pine, larch, lobular Yang, locust, elm, Bunge, Ailanthus, Salix, etc.; bush Type: Amorpha, seabuckthorn, Caragana, torch trees, etc.; planting density: coniferous 3300 / hm2, mixed and broadleaf forest 1995 / hm2. benefits of Economic for the 0.78, 0.66 ecological benefits, comprehensive benefits to 1.49.2 Grass grazing mode: Configure the main forest grass strip type, Joe savanna grass type, grass type of three massive distribution. Joe Lean tree planting grass type 750 1500 / hm2 timber tree, forest planting high-quality forage. Selection of tree species oriental is Robinia pseudoacacia, Prunus, apricot, dates, etc., 2250 / hm2; economic benefits to 0.93. benefits of ecological for the 0.69, 1.62 comprehensive benefits.3 Forest Medicine Model: basically the same configuration with the grass, animal husbandry, herbal medicines and baicalin mainly seabuckthorn, seabuckthorn stable density of 1586 (bundle) / hm2, the best density of Scutellaria1335 / hm2. Cost 0.84. ecological benefits for the 0.67, comprehensive benefits to 1.51.4 Forest Mode: configuration mode for the shrub type, with similar ecological forest shrub, but the relative ecological forest density is much smaller. Species selection apples, walnuts, dates, Prunus, apricot, gingko, chestnut and other ecological use either species, planting density under different tree species planted were spacing 3m×3m, 4m×5m and 5m×6m and so on. 0.89 economic and ecological benefits for the 0.71, 1.60 overall efficiency.5 gray correlation analysis of various model-based evaluation of comprehensive benefits, economic order: grass grazing pattern> Economic Forest> Forest Medicine Model> Ecological Forest model. Eco-efficiency: Forest pattern> Grass grazing pattern> ecological forest mode> Forest Medicine Model. Comprehensive benefits in the order: grass grazing pattern> Economic Forest> Forest Medicine Model> eco-forest model.