斜纹夜蛾取食为害对大豆农艺性状和土壤酶活性的影响

Effects of Spodoptera litura feeding on soybean agronomic characters and soil enzyme activities

为研究斜纹夜蛾取食为害对大豆农艺性状和土壤酶活性的影响,随机选取了5个大豆品种,‘中黄13’‘中黄37’‘中黄39’‘石豆7号’和‘菏豆15’,测试不同虫口密度的斜纹夜蛾取食为害后大豆的产量和蛋白质、脂肪含量及土壤酶活性。结果表明:大豆品种、斜纹夜蛾虫口密度以及两者间的互作对大豆的单株结荚数、单株荚粒数、单株产量、蛋白质含量、脂肪含量以及土壤脲酶和磷酸酶活性均有显著影响,但对根际土壤酸碱度没有显著影响。随着虫口密度的增加,大豆的结荚数、荚粒数、单株产量、蛋白质含量、脂肪含量减少,土壤的脲酶活性和磷酸酶活性降低。综上所述,斜纹夜蛾取食为害对大豆的产量和营养物质含量产生了不利影响,对土壤酶活性产生了消极作用。

To explore the effects of Spodoptera litura feeding on soybean agronomic characters and soil enzyme activities,five soybean varieties,including ‘Zhonghuang 13’‘Zhonghuang 37’ ‘Zhonghuang 39’ ‘Shidou 7’,and ‘Hedou 15’ were randomly selected and their yield,protein and fat contents as well as rhizosphere soil enzyme activities were tested after fed by S.litura larvae with different densities.The results showed that soybean varieties,larval densities and their interaction significantly influenced number of pods per plant,number of seeds per plant,yield per plant,protein content,fat content and soil urease and phosphatase activity,but there was no significant effect on the pH value of rhizosphere soil.The number of pods per plant,number of seeds per plant,yield per plant,protein content,fat content,and soil urease and phosphatase activities all decreased with increasing larval densities.Therefore,we concluded that feeding of S.litura larvae had adverse effects on soybean yield and nutrient content,and had negative effects on soil enzyme activities.