The Effect Analysis Of Different Vegetation Recovery Models Around The Damage Area Of Mountain Fengshan In Yantai City

In order to find optimal recovery patterns for damaged mountain body, the effect of different recovery patterns was evaluated, which would provide decision basis and technical support for plant selection of vegetation reconstruction in damaged mountain body. Soil healthy of different recovery patterns was assessed by using principal component analysis (PCA) and Savinovs method of dry sieving around the surrounding damaged mountain body in Yantai, and using subject function method to analyze evaluation of the recovery mode. The main conclusions are as follows:1. The comprehensive analysis of restoration models showed: the plant growth conditions presented: Quercus acutissima pure forest> Robinia pseudoacacia pure forest> Pinus thunbergii pure forest> Robinia pseudoacacia - Pinus thunbergii mixed forest> Quercus acutissima- Pinus thunbergii mixed forest; and the broadleaved tree species grow better than coniferous species.2. the soil densities of artificial revegetation were significantly lower than that of mature brushwood,in which,that of Quercus acutissima and Pinus thunbergii mixed forest was the lowest. The effects of soil porosity improvement in declining order were : mixed forests > pure forests > brushwood. The soil porosities in 0-10cm layer were largger than that of 10-20cm. Soil water holding capacities and its average mass diameters of soil aggregate were all higher than that of brushwood. Among these revegetations,Quercus acutissima and Pinus thunbergii mixed forest was the best. Soil structure health comprehensive evaluations indicate that the brushwood was the worst,Quercus acutissima and Pinus thunbergii mixed forest was the best. The results can provide scientific references for revegetations of similar damaged mountain.3. The soil nutrient and soil microorganisms declined as the depth increased in all kinds of restoration models. Lacking of big roots which would meaken if soil-fixing effect. The soil and water loss, nutrient loss and soil fertility loss of the brushwood of nature restoration were serious. And from those comparisons, if can be proposed that great difference existed between soil nutrients of nature restoration and artificial restoration, the ability of the following forest to improve the soil nutrients were: Quercus acutissima- Pinus thunbergii mixed forest> Robinia pseudoacacia - Quercus acutissima mixed forest> Robinia pseudoacacia - Pinus thunbergii mixed forest> Pinus thunbergii pure forest> Robinia pseudoacacia pure forest> Quercus acutissima pure forest> brushwood. The comprehensive analysis showed that artificial vegetation restoration could increase soil urease activity and decrease polyphenol oxidase activity more significantly than that of brushwood. Mixed forest forest was better than pure forest on damaged mountain body, and the brushwood was the worst, during which the Quercus acutissima- Pinus thunbergii mixed forest was the best, and Robinia pseudoacacia - Pinus thunbergii mixed forest, Quercus acutissima pure forest, Robinia pseudoacacia - Quercus acutissima mixed forest, Pinus thunbergii pure forest and Robinia pseudoacacia pure forest followed.4. Improvements to microclimate analysis showed that: the most remarkable improving effect was found on mixed Quercus acutissima and Pinus thunbergii forest stends followed by mixed forest of Robinia pseudoacacia and Quercus acutissima, mixed Robinia pseudoacacia and Pinus thunbergii forest, prue forest of Quercus acutissima, prue Pinus thunbergii forest, prue Robinia pseudoacacia forest , brush and grass pattern in order respectively.5. the Shannon-Weiner(H) and species abundance and Abundance index(S) sequencing of different vegetation recovery model ranged as: Comprehensive analysis showed that: index of different vegetation recovery model ranged in declining order as: mixed forest of Quercus acutissima and Pinus thunbergii > mixed forest of Robinia pseudoacacia and Pinus thunbergii > mixed forest of Robinia pseudoacacia and Quercus acutissima > pure Quercus acutissima forest > prue Pinus thunbergii forest > pure Robinia pseudoacacia forest > shrub and underbrush.6. After 24 selected factors was calculated by method of membership function, the membership grade was obtained and averaged,then the recovery effects of 7 vegetation recovery model were summarized as: mixed forest of Quercus acutissima and Pinus thunbergii > mixed forest of Robinia pseudoacacia and Quercus acutissima > mixed forest of Robinia pseudoacacia and Pinus thunbergii > pure Quercus acutissima forest > pure Robinia pseudoacacia forest > prue Pinus thunbergii forest > shrub and underbrush.7.The resalt of the restoring effect of different vegetation restoration pattern using set pair analysis method shawed: Results from good to bad is: mixed forest of Quercus acutissima and Pinus thunbergii > mixed forest of Robinia pseudoacacia and Quercus acutissima > mixed forest of Robinia pseudoacacia and Pinus thunbergii > pure Quercus acutissima forest > pure Robinia pseudoacacia forest > prue Pinus thunbergii forest > shrub and underbrush. and the three mixed forest pattern belong toâ… , the three pure forest pattern belong toâ…¡, the three brush and grass pattern belong toâ…¢...