不同供氮水平对玉米秸秆降解初期碳素矿化及微生物量的影响

被引：29

作者：

丁雪丽

何红波

李小波

白震

解宏图

张旭东

机构：

[1] 中国科学院沈阳应用生态研究所陆地生态过程重点实验室

来源：

土壤通报 | 2008年 / 04期

关键词：

供氮水平; 秸秆; 降解; 碳素矿化; 微生物量;

D O I：

10.19336/j.cnki.trtb.2008.04.015

中图分类号：

S141 [农家肥料];

学科分类号：

090101 ;

摘要：

采用室内恒温(25℃)培养方法研究了不同无机态氮供应水平(0、30、60、80、100Nmgkg-1土)对玉米秸秆降解初期的影响。试验结果表明:碳素的矿化量随着添加无机氮源数量的增加而增加,其中两个高氮添加量(80、100mgkg-1)处理的碳素矿化量要高于不加氮源和两个低氮添加量处理(30、60mgkg-1)。不同氮量添加条件下微生物量碳的变化呈相同趋势。利用土壤呼吸和微生物量碳计算而得的微生物代谢商在低量氮素处理条件下高于较高量氮源添加处理,表明高量氮素添加可提高微生物对秸秆碳素的利用效率。以上结果说明:对C/N比较大的玉米秸秆而言,土壤中无机氮素的供给对残体碳素的初始矿化有明显的影响,相对较低的氮源供给量不能满足微生物快速生长代谢对氮素的需求,使秸秆降解过程受到一定程度的抑制,不利于土壤氮素截获。因此在大田条件下,秸秆还田时要考虑氮素的供应问题,根据实际需要确定秸秆还田时间及肥料氮素施用水平。

引用

页码：784 / 788

页数：5

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