Effect Of Different Vegetation Restoration Models On Soil Characteristics And Ecological Environment

In order to explore Gansu Taizi mountain area recovery effects on soil properties and forest environment of different vegetation,vegetation restoration mode and exploration of sustainable development,on the 4 types of different vegetation coverage of forest land(spruce forest,Pinus tabulaeformis forest,poplar forest,mixed forest and grassland investigation)were related to the different forest.The main physical and chemical indexes of soil index were measured,the effects of vegetation restoration pattern on soil characteristics evaluation,analysis of the microclimate of the woodlands,with a view to the area and similar areas of returning farmland to forest vegetation restoration and provide a theoretical basis for the.The main results are as follows:(1)Different vegetation restoration types have some effects on soil physical properties.Soil moisture,maximum soil water holding capacity,field water holding capacity,capillary water holding capacity,capillary porosity and total porosity were the highest in mixed forest land,while soil bulk density was lowest in mixed forest land.At the same time,the soil moisture,soil water holding capacity and soil porosity of different vegetation restoration patterns were higher than those of the grassland(CK).The soil water holding capacity and soil porosity of 0-20 cm soil layer are all larger than that of 20-40 cm soil layer,and the soil bulk density is more serious in 20-40 cm soil layer.(2)After vegetation restoration,soil pH value decreased,but were close to neutral,0-20 cm soil 6.81-6.92,soil 20-40 cm range is 6.95-7.04;soil organic matter,soil total nitrogen,soil available nitrogen,total phosphorus,available phosphorus and available potassium content were increased,and the highest in the mixed forest a significant difference compared with the control.The total potassium content in the shallow soil(0-20cm)was highest in the grassland(CK),and in the deep soil(20-40cm),it was still the highest in mixed forest land.At different soil levels,the contents of organic matter,nitrogen,phosphorus and potassium in shallow soil were higher than those in deep soil.(3)The structure of soil aggregates changed after vegetation recovery.Different types of vegetation cover,soil aggregate content particle size less than 0.5mm byweed(CK)the most,followed by mixed forest,poplar and spruce forest is the least;2-10 mm in diameter between the aggregate content in grassland at least;the rest of particle size between the aggregate content difference.Longitudinal comparison showed that smaller aggregates were more abundant in shallow soil,while grain size was greater than 2mm,and agglomerates were mostly in deep soil.(4)The annual variation of soil temperature in different soil layers was highest in the grassland(CK),but there was little difference between the 4 types of forest land.The daily variation of soil temperature has the largest range of shallow soil,while the deep soil is relatively stable with small amplitude.After vegetation restoration,in the 4-10 month,the change of the environment temperature was lower than that of grassland,but also in high temperature season,temperature difference between woodland and grassland is greater in August,up to 1.7 degrees;the change of the environment humidity were also higher than that of grassland,the mixed forest was the highest.