玉米秸秆腐解液对幼苗根际土壤理化性质的影响

摘要

In order to explore the effects of maize stalk decomposing substance on soil physical and chemical properties of seedling rhizosphere,‘Zhengdan 958’ was used as test materials.The effects of maize stalk decomposing substance with different decomposing time (0,60,120,180 d) and different mass concentration (0.125,0.25,0.5 g/mL) on soil pH,EC values,inorganic nitrogen,organic matter,available phosphorus and potassium were analyzed in seedling seeding rhizosphere.The results showed that the soil pH reached the highest level under the treatment of mass concentration of 0.5 g/mL and decomposition 180 d.The soil pH was lower than control with mass concentration of 0.5 g/mL and decomposition 60 d and 120 d,respectively.The soil EC values reached the highest level with mass concentration of 0.125 g/mL and decomposed 120 d.The soil inorganic nitrogen reached the highest level with mass concentration of 0.5 g/mL and decomposed 120 d.The soil organic matter reached the highest level with the mass concentration of 0.125 g/mL after decomposed 60 d in 4,5,6 leaf stage of maize seedlings.The soil available phosphorus increased with increase of mass concentration after decomposition 60 d,120 d and 180 d.The soil available potassium reached the highest level with mass concentration of 0.5 g/mL after composition of 120 d.Therefore,the decomposition substance with different decomposition time and different mass concentrations had effect on soil physical and chemical properties of seedling rhizosphere,it was most significant effect of soil nutrient environment with mass concentration of 0.5 g/mL of ecomposed 120 d.%为了探究玉米秸秆腐解液对幼苗根际土壤理化性质的影响,选取‘郑单958’为供试材料,分析不同腐解时间(0、60、120、180 d)和不同腐解质量浓度(0.125、0.25、0.5 g/mL)下秸秆腐解液对幼苗(四叶、五叶、六叶期)根际土壤pH、电导率(EC值)、无机氮、有机质、速效磷、速效钾的影响.结果表明:在腐解180 d、0.5g/mL质量浓度处理下土壤pH达最高,60 d、120 d,0.5 g/mL质量浓度处理下土壤pH低于对照;在腐解120 d、0.125 g/mL质量浓度处理下土壤EC值达最高,在腐解120 d、0.5 g/mL质量浓度处理下土壤无机氮质量分数最高;幼苗四叶、五叶、六叶期均在腐解60 d、0.125 g/mL质量浓度处理下的土壤有机质质量分数达最高;土壤速效磷质量分数在60 d、120 d、180 d腐解液处理下均随腐解液质量浓度增大而升高.在腐解120 d、0.5 g/mL质量浓度处理下土壤速效钾质量分数较高.因此,腐解时间不同的秸秆腐解液不同质量浓度均对土壤的理化性质产生影响,120 d腐解时间的高质量浓度(0.5 g/mL)秸秆腐解液对土壤养分环境影响最为显著.