大豆是黑龙江竹重要农作物之一。由于种植面积增加很快,大豆连作面积不断扩大,致使土壤养分失调,病虫害加剧,大豆生长发育受阻,产量下降。有关大豆连作减产的原因报道很多,但结论不尽一致。 土壤酶活性是土壤肥力和生产力的指标之一,国内外报道较多。但目前对大豆连作情况下土壤酶活性变化的报道不多。为此我们从1989年开始开展了有关问题的探讨。 一、材料与方法 试验采用田间小区和盆栽模拟相结合的方法进行。供试土壤为中层黑土。基础肥力为:有机碳1.54％,全 Soybean is one of the important crops of bamboo in Heilongjiang Province. Due to the rapid increase in planting area, continuous cropping of soybean continued to cause soil nutrient imbalance, pest and disease exacerbation, obstruction of growth and development of soybean and decrease of yield. There are many reports on the reasons for the continuous cropping down of soybean, but the conclusions are not consistent. Soil enzyme activity is one of the indicators of soil fertility and productivity, more reports at home and abroad. However, there are few reports on the changes of soil enzyme activities under continuous cropping condition. To this end, we started from 1989 to explore the issue. First, materials and methods The experiment was carried out by a combination of field plot and pot experiment. Soil for the test for the middle of black soil. The basic fertility: organic carbon 1.54%, all