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阿特拉津对不同肥力土壤蔗糖酶活性的影响

Keywords: 阿特拉津,土壤蔗糖酶活性,土壤肥力

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Abstract:

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。

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