Soil Physical and Chemical Characteristics of Saline-alkali Forest Land and Its Effects on Vegetation Biodiversity in the Lower Reaches of Shiyang River
Taking the saline-alkali land in the lower reaches of Shiyang River as the research object,according to the three criteria of mild,moderate and severe,the salt content,composition and vegetation species diversity of saline-al-kali land were investigated by plot method.The results showed as the following four aspects.(1)The contents of Cl-ions and SO42-ions in the soil salt of the salinized forest land in the lower reaches of Shiyang River were the highest,accounting for a large proportion.The content of Cl-ions in Y1 and Y3 plots was higher than that of SO42-ions,and the content of SO42-ions in other plots was higher than that of Cl-ions.The soil types generally belonged to sulfate-chloride type and chloride-sulfate type.(2)The soil salinity of saline-alkali forest land in the lower reaches of Shiyang River was mainly concentrated in the range of 0-50 cm in the surface layer,and the soil salt score below 50 cm was relatively small and stable.(3)Soil salinity and moisture were closely related to soil tex-ture.The soil water content of loam and sandy loam was relatively high,and the soil salinity was relatively low,which was more conducive to vegetation growth and recovery.There was a positive correlation between vegetation coverage and soil moisture,and the greater the coverage,the greater the soil moisture.(4)The species composition and quantity of saline-alkali forest land were closely related to soil salinity,soil moisture,soil type and climate drought.Soil salinity and moisture were positively correlated with species composition and quantity.The lower the soil salinity and the higher the moisture,the greater the quantity.The soil surface salt concentration was relatively low from soil freezing to March of the next year.Vegetation restoration in saline-alkali land should be planted before soil freezing,and the depth of soil preparation and excavation should be 50 cm.In the next year,artificial water replenishment leaching of the soil surface salt should be carried out from April to June,which can improve the sur-vival rate of afforestation and promote vegetation restoration.
the lower reaches of Shiyang Riversaline-alkali landsoil physical and chemical characteristicsspecies diversity
万方数据
维普
