Regulation Of Soil Physical And Chemical Properties By Different Governance Patterns In Severe Erosive Degraded Area

The soil erosion of the red soil area in the southern granite is serious,and a large amount area of Pinus massoniana was planted by afforestation.However,the vegetation structure of the Pinus massoniana forest is still serious due to the lack of other vegetation cover.Changting County is one of the most serious counties of Pinus massoniana forest land loss,among which several towns around Hetian town are typical representatives.The government took some efficient governance pattems,and has been a good governance effect after decades of management.In this paper,the typical problem of soil erosion in eroded degraded Pinus massoniana forest land in typical red soil area of southern granite was studied.The typical red soil area of Hetian Town,Changting County,Fujian Province was selected as the study area,Slope and other basic conditions similar to the four different governance models and four different governance years and a control plot,through different governance models between the horizontal comparative analysis and different governance years of longitudinal comparative analysis,the regulatory mechanism and regulatory benefit on the physical and chemical properties of soils with severe erosion and degeneration were systematically studied.The main conclusions of this paper are as follows:(1)The different soil water content,total porosity,soil root,organic matter,total nitrogen,total phosphorus,available phosphorus,total potassium,available potassium and soil erosion resistance were significantly improved by different governance modes and different governance years,and reduced soil bulk density,soil hardness.(2)Considering the different governance modes and different management years can improve the physical and chemical properties of soil surface and subsurface,the best effect of M2 tree,shrub and grass in different management modes,the second effect of M1 inefficient forest transformation,the effect of M4 ban in general.In different governance years N13 governance years has the best results,followed by N10,N7 times,N4 governance effect in general.(3)Soil roots,organic matter,total nitrogen,total phosphorus,available phosphorus,total potassium and available potassium increased with the increase of the treatment period,and there was obvious accumulation.Soil disintegration is decreased with the increase of the treatment period.(4)Different governance patterns and different governance years,the pH value of the sample is acidic,the pH value after treatment will decline,but has no impact on the vegetation restoration.