Soil Hydrological Functions Comparison Of Yunnan Pine Forest Under Different Restoration Models On Haifeng Karst Basin Of Eastern Yunnan

This study based on restoration benefit evaluation of degrading Karst ecosystems,to explore soil hydrologic features and mechanism of Pinus Yunnanensis after Karst ecosystem was degraded.Taking the Haifeng faulted basin as the study area of East Yunnan,samples including primeval forest,shrub forest,Yunnan Pine secondary forest,Yunnan Pine artificial mixed forest and Yunnan pine pure forest.The impacts of vegetation restoration on soil hydrological function were analyzed by used soil hydrologic functional model and coupling coordination model.This study mainly obtains the following research results:(1)The increased of litter accumulation,water-holding capacity,root density,basal area and tree density with the vegetation restoration.While the restored vegetations also contributed to the improvement of soil properties,also increase soil water content,soil porosity,capillary porosity,noncapillary porosity,capillary moisture capacity,organic carbon,organic matter,ammonium nitrogen,nitrate nitrogen,effective phosphorus,available potassium,soil permeability and intrinsic permeability.The soil bulk density and the pH are decreased.The different physical and chemical properties of the soil make the water infiltration performance and water storage capacity of the soil layer different,resulting in different hydrological functions of the soil.(2)Vegetation restoration promoted the regulatory function of soil water,restoring the water yield formation and water yield function of soil.The calculation results of soil hydrological function model indicated that primary forest(1)>secondary forest(0.64)>artificial mixed forest(0.61)>Yunnan pine pure forest(0.53)>shrubland(0.31).With the original of reference,soil hydrological function of natural secondary forest is increased by 71% compared with shrubland.The soil hydrological function of the artificial mixed forest increased by 96% compared with the shrubland.The soil hydrological function of pine pure forest in Yunnan increased by 106% compared with shrubland.(3)The soil hydrological function is affected by soil and vegetation,different pine vegetation communities have different soil-vegetation coupling degrees.As the vegetation recovers,the coupling between vegetation and soil increase.Vegetation-soil coupling coordination degree from intermediate coordinated soil lag development type to well coordinated soil lag development type.Vegetation-soil coupling coordination degree from well coordinated soil lag development type to high quality coordinated vegetation soil synchronous development type.With the restoration of vegetation,the soil hydrological function had a gradual increased.Study found that natural restoration is superior to artificial restoration.The mixed forest species are superior to the pure forest.The combination of natural restoration on and artificial restoration can effectively improve karst ecosystems.