榆林飞播林区土壤地球化学特征

以榆林飞播林区的土壤微生物、土壤养分和土壤可溶性盐为研究对象,对林区土壤可溶性盐的变化规律及其与土壤养分、微生物的相关性进行研究,为水土资源可持续利用以及飞播造林功效的提高提供理论依据.研究表明,研究区土壤属硫酸盐型,土壤层分异特征不显著,土壤仍处于初级发育阶段.土壤总盐与养分的相关性不明显,适当增加K⁺利于真菌的存活和生物量的积累,在1 kg土壤中,每增加1 g K⁺,真菌数量就会增加14个左右.在土层表层,适量减少Cl^-能促进土壤细菌的生长,在40 cm土层的盐分上行过程中出现表聚现象,在土壤中层,出现板结现象,在土壤底层,HCO₃^-和Na⁺质量分数的增加,有利于土壤全氮质量分数的增加,且HCO₃^-的影响力最强.

Geochemical characteristics of the soil in Yulin aerial seeding forest

To the soil microorganisms,soil nutrient and soil soluble salt of Yulin aerial seeding forest as the object of study,research on the variation law of forest soil soluble salt and the correlation to soil nutrient and microorganism,in order to provide a theoretical basis for the sustainable utilization of water resources and the improvement of forestation effect by aerial seeding effect.The results show that the study area soil genus sulfate type,soil layer distribution is not significant,the soil is still at the primary stage of development.In the soil surface,moderate reduction of chlorine ion can promote the growth of bacteria in soil.Soil salt and nutrient correlation is not obvious,appropriate concentration of potassium ions increase can be benefit to fungus survival and biomass accumulation.While additional 1 gram of potassium ions the number of fungi will increase by almost 14 in 1 kg.In the soil layer of 0-40 cm,soluble salt presents surface aggregation phenomenon in the uplink process,meanwhile,the salt present surface aggregation phenomenon in the middle of soil layer.The increasing of Na⁺ and HCO₃^- contents is favorable to the increase of total soil nitrogen content and the HCO₃^- is of the most obvious influence in the bottom of soil layer.