阿特拉津对不同肥力土壤蔗糖酶活性的影响

Effect of Atrazine on Soil Invertase Under Different Soil Fertilities

采用现场采集土壤样品、室内施药培养方法,研究了除草剂阿特拉津对4种长期定位施肥处理下土壤蔗糖酶活性的影响。结果表明,阿特拉津对不同肥力土壤中蔗糖酶的影响有明显差异。CK、NPK、NPK+S土壤受影响规律相似,施药初期对土壤蔗糖酶的影响较小,激活或抑制率随着处理时间延续呈现“升-降-升”的规律,第4d和第16d的激活影响最明显。NPK+M土壤蔗糖酶处理当天受到明显的激活作用,此后就受到较强的抑制作用。按处理时间比较可以看出4种土壤蔗糖酶的激活率以NPK为最高,NPK+S、CK依次次之;而NPK+M土壤蔗糖酶整体处于被抑制状态。同一处理时间下4种土壤都以阿特拉津浓度为20mg·kg-1处理时激活率最大。

The effects of atrazine under different concentrations on soil invertase in four long- term fertilization soils were studied. There existed significant differences in the effects of atrazine on soil invertase among different fertility soils. Similarly, the activity of soil invertase changed small under CK, NPK as well as NPK+ S in the early treatment, and showed an “ up- down- up” rule during the experiment. The effects were most obvious in the 4th and 16th day after treatment. The soil invertase in NPK+ M was activated evidently on the day of treatment, and afterwards, was inhibited very strongly. According to the treatment time, the activate rate of soil invertase in NPK was the highest, the NPK+ S's was the second and the CK's was the lowest. However, the soil invertase activity of NPK+ M was inhibited mostly. The activate rate of the soil invertase was the biggest among the four soils when the concentration of atrazine was 20 mg· kg- 1 at the same treatment time.