红壤性水稻土,肥力水平,添加葡萄糖,氮素转化
," /> 红壤性水稻土,肥力水平,添加葡萄糖,氮素转化
,"/> paddy soils of subtropical China,soil fertility,glucose addition,nitrogen transformation
,"/> <font face="Verdana">添加葡萄糖对不同肥力红壤性水稻土氮素转化的影响#br# </font>

中国农业科学 ›› 2010, Vol. 43 ›› Issue (8): 1617-1624 .doi: 10.3864/j.issn.0578-1752.2010.08.010

• 土壤肥料·节水灌溉·农业生态环境 • 上一篇    下一篇

添加葡萄糖对不同肥力红壤性水稻土氮素转化的影响#br#

贾俊仙,李忠佩,车玉萍   

  1. (中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室)
  • 收稿日期:2009-09-08 修回日期:2009-11-30 出版日期:2010-04-15 发布日期:2010-04-15
  • 通讯作者: 李忠佩

Effects of Glucose Addition on N Transformations in Paddy Soils with a Gradient of Organic C Content in Subtropical China#br#

JIA Jun-xian, LI Zhong-pei, CHE Yu-ping#br#   

  1. (中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室)
  • Received:2009-09-08 Revised:2009-11-30 Online:2010-04-15 Published:2010-04-15
  • Contact: LI Zhong-pei

摘要:

【目的】研究不同肥力水平红壤性水稻土氮素转化特征以及添加葡萄糖的影响,可为正确认识碳源影响氮素转化的作用机制、并根据不同土壤条件制定合理的氮素养分管理措施提供科学参考。【方法】选择不同肥力水平的红壤性水稻土,通过室内培育试验研究土壤氮素的矿化作用、硝化作用、反硝化作用特征以及添加葡萄糖对氮素转化作用的影响在不同肥力土壤间的差异。【结果】红壤性水稻土氮素矿化作用及反硝化作用强度均表现为高肥力>中肥力>低肥力。培养的第一周,高肥力红壤性水稻土氮素矿化量和反硝化速率分别是相应中、低肥力土壤的1.9、5.3倍和1.1、2.9倍。添加葡萄糖后土壤氮素矿化量显著降低,但不同肥力土壤降幅不同,高、中、低肥力土壤分别降低了78.8%、109.2%、177.4%,彼此间差异显著。添加葡萄糖对不同肥力土壤反硝化作用的影响亦不同,低肥力土壤反硝化速率提高了166.2%,中肥力土壤提高了14.4%,而高肥力土壤则没有明显变化。供试红壤性水稻培育试验一周后,土壤硝态氮含量最高仅有0.62 mg&#8226;kg-1,硝化率最高仅为0.33%,添加葡萄糖处理土壤中硝态氮含量及硝化率没有明显变化。【结论】不同肥力水平红壤性水稻土氮素矿化作用及反硝化作用强度有显著差异,均随土壤有机质含量升高而增强。添加葡萄糖抑制了土壤氮素矿化作用,促进了反硝化作用,但作用效果在不同肥力土壤间有显著差异,在较低肥力土壤上的作用效果大于较高肥力土壤。添加葡萄糖和土壤有机质含量对红壤性水稻土硝化作用的影响均不明显。

关键词: 红壤性水稻土')">红壤性水稻土, 肥力水平, 添加葡萄糖, 氮素转化

Abstract:

【Objective】 In order to understand the mechanisms of N transformation and manage N fertilization better, the effect of glucose addition on N transformation in paddy soils with a gradient of organic C content were determined. 【Method】 Changes of mineralization, nitrification and denitrification in paddy soils, as well as their response to glucose addition were measured by incubation experiment. 【Result】 Intensity of mineralization and denitrification were: soils with high fertility > soils with middle fertility > soils with low fertility. During the first week of incubation, net mineralization and denitrification rate in paddy soils with high fertility were 1.9 and 1.1 times of that in soil with middle fertility and 5.3 and 2.9 times of that in soils with low fertility, respectively. Addition of glucose decreased approx. 78.8%, 109.2%, and 177.4% of net mineralization in soils with high, middle, and low fertility, respectively. However, denitrification rate in soils with middle and low fertility increased by 14.4% and 166.2%. The highest nitrate content in all the tested soils was 0.62 mg&#8226;kg-1 and the highest nitrification ratio was 0.33%. Addition of glucose had no obvious effects on nitrate content and nitrification ratio. 【Conclusion】 It was suggested that the intensity of mineralization and denitrification were quite different in soils with different fertility. The intensity was increased with the increase of soil organic C content. Addition of glucose decreased mineralization, but increased denitrification. The effects of glucose addition were significantly different in different soils. The effect of glucose addition on soils with low organic C content were greater than that on soils with high organic C content. Neither addition of glucose nor inherent soil organic C had obvious effects on nitrification of test paddy soils.

Key words: paddy soils of subtropical China')">paddy soils of subtropical China, soil fertility, glucose addition, nitrogen transformation