不同种植密度条件下两种穗型冬小麦品种根际土壤酶活性的动态变化

在大田试验条件下，研究了2种穗型冬小麦品种在不同种植密度条件下根际土壤酶活性的动态变化。结果表明，随着生育时期的推进，两种穗型冬小麦品种根际土壤蛋白酶、过氧化氢酶和脲酶活性均呈先增高后降低的单峰曲线变化，拔节期和抽穗期活性较高，返青期和开花期活性则较低。不同种植密度条件下，豫麦49—198系根际土壤蛋白酶、脲酶活性均随密度增加呈先增高后降低的变化趋势，而过氧化氢酶活性表现不明显；兰考矮早八3种根际土壤酶活性随密度增加呈先降低后增高的变化趋势。不同密度水平下3种酶活性的方差分析表明，蛋白酶、脲酶差异达到显著水平，过氧化氢酶差异不显著。

Dynamic Changes of Soil Enzyme Activity in Rhizosphere of Two Spike-Type Winter Wheat Cultivars With Different Planting Densities

The dynamic changes of soil enzyme activity in rhizosphere of two spike-type winter wheat cultivars with different planting densities were studied under field experiments. The results indicated that the activities of protease, catalase and urease of two spike-type winter wheat cultivars presented a single-peaked curve along with growth stage. There appeared the higher values in jointing and heading stage, and the lower values in reviving and anthesis stage. There were different trends of soil enzyme activities in rhizosphere of two spike-type winter wheat cuhivars. To the Yumai 49--198,the activities of protease and urease increased at low planting densities but decreased with the increase in planting density , but change of catalase was not obvious. But to the lankaoaizao 8 all the three soil enzyme activity of decreased at low planting densities but enhanced with the increase in planting density. In addition, the variance analysis showed that the activities of protease and urease reached significant level among different treatments.