不同施肥组合对科尔沁沙地南缘沙地土壤健康指标的影响

The Effect of Different Fertilization Combinations on Sandy Soil Health Indicators in the Southern Edge of Horqin Sandy Land

为研究不同施肥组合对沙地土壤改良的效果,以辽宁省阜新市彰武县的沙地土壤为考察对象,开展了试验研究。试验以不施肥为对照(CK)处理,设置生物有机肥分别与含腐殖酸肥料(OH)、含聚谷氨酸肥料(OP)和中微量元素肥(OM)混施3个施肥处理,测定施肥后6、12、18个月的土壤中微生物数量和土壤理化性状的变化。结果表明:不同施肥处理的土壤中微生物数量均呈现细菌>放线菌>真菌的变化趋势,其中OH处理的细菌数量最多,3个取样时间的细菌数量平均值为1.510×10^(7)cfu/g,是CK处理的5.2倍;施肥处理的土壤中全磷、全钾和有机质含量均得到提高,OP处理的全钾含量平均值最高,质量分数为5.96 g/kg;施肥处理的土壤pH均呈下降趋势;施肥处理的地上部植物生物量提高。施用不同组合的肥料可以有效提高土壤微生物的数量,改善土壤理化性状,提高地上部植物生物量,是一种合理的沙地改良措施。

In order to study the effects of different fertilization combinations on soil improvement in sandy areas,an experiment study is conducted on the sandy soil in Zhangwu County,Fuxin City,Liaoning Province.The experiment used no fertilization as a control(CK)treatment,and set up three fertilization treatments of bio-organic fertilizer mixed with humic acid fertilizer(OH),polyglutamic acid fertilizer(OP),and medium and trace elements fertilizer(OM).The changes in soil microbial quantity and soil physicochemical properties are measured at 6,12,and 18 months after fertilization.The results show that the number of microbial in the soil under different fertilization treatments show a trend of bacteria>actinomycetes>fungi.Among all the treatments,OH treatment has the highest number of bacteria,and the average number of bacteria in the three sampling times is 1.510×10^(7)cfu/g,which is 5.2 times that of CK treatment.The total phosphorus,total potassium,and organic matter content in the soil treated with fertilization are all increased.The average total potassium content in the OP treatment is the highest,with a mass fraction of 5.96 g/kg.The soil pH of fertilization treatment show a decreasing trend.Fertilization treatment increases aboveground biomass of plants.Applying different combinations of fertilizers can effectively increase the number of soil microbial,improve soil physicochemical properties,and increase aboveground biomass of plants,making it a reasonable measure for improving sandy land.