Vegetation Restoration Model And Benefit Evaluation For Severely Erosive Degraded Area Of Pinus Massoniana Forest In Changting County

Changting county is one of the most serious soil erosion areas in red soil region of south china,in the long-term practice,many successful governance models have been explored,but the governance model is diverse and arbitrary,which limits the promotion of the model.In view of this,this paper summarizes 4 successful vegetation restoration models in Pinus massoniana forest in severe erosion degraded area,condenses its key technology and assesses the soil physical and chemical properties,vegetation growth,biodiversity and comprehensive ecological benefits of different models,in order to provide reference for the popularization and application of these models.The main results are as follows:(1)This paper introduces the principles of vegetation restoration and methods of plant species allocation in Pinus massoniana forest in severe erosion degraded area.According to the principle of vegetation zonality,20 species of native plants were selected,including 12 species of arbors,3 shrubs and 5 herbs.on the basis of the characteristics of different erosion degraded of Pinus massoniana forest,this paper introduces the main technical points of 4 governance models,such as seeding grass at small pitting,seeding grass and planting shrub at the equal altitude ditch,"old-pine" renewing,herb-shrub-arbor mixing,and standardizes implementing measures.(2)The ecological benefits of the 4 models is obvious,in the physical and chemical properties of soil,the non-capillary porosity of soil is improved significantly,coverage,canopy density and arbor density of each model are greatly improved,community plant species,especially herbs and shrubs under the forest,have increased.But the soil nutrients are still very poor,and the ecological comprehensive benefit FI value is only 0.17-0.24 times of the local top community,and the road to recovery is long.(3)The four models of seeding grass at seeding grass at small pitting,seeding grass and planting shrub at the equal altitude ditch,"old-pine"renewing,herb-shrub-arbor mixing,have scientific configuration and standard technology,they are suitable for further application and popularization.It is also suggested that fertilization and tending are carried out in the final-period management of each pattern,intermediate cuttings should be taken for the high-density Pinus massoniana forest,replanting of native broad-leaved tree species for two models of seeding grass at small pitting and "old-pine" renewing,in order to facilitate the positive succession of vegetation.