干旱区生态环境知识资源中心(Arid): DCD在不同质地土壤上的硝化抑制效果和剂量效应研究

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	DCD在不同质地土壤上的硝化抑制效果和剂量效应研究
其他题名	Nitrification inhibition and dose-dependent effect of dicyandiamide on sandy,loamy and clayey soils
	刘倩; 褚贵新; 刘涛; 王健; 冶军; 王飞; 梁永超
来源期刊	中国生态农业学报
ISSN	1671-3990
出版年	2011
卷号	19 期号:4 页码:765-770
中文摘要	通过硝化抑制剂抑制土壤硝化作用是实现作物铵硝混合营养和提高氮肥利用率的重要途径之一。本试验采用室内模拟的方法,在人工气候室(25℃)黑暗培养条件下,应用新疆石灰性土壤研究了不同剂量的双氰胺(dicyandiamide,DCD)在砂土、壤土、黏土3种不同质地土壤中对土壤硝态氮、铵态氮转化的影响及DCD的剂量效应和硝化抑制效果。处理30 d内,各剂量DCD处理对砂土的硝化抑制率为96.5%～99.4%(平均值为98.3%),在黏土上为66.9%～85.6%(平均值为77.6%),在壤土上为49.3%～79.4%(平均值为67.7%),总体硝化抑制率表现为砂土>黏土>壤土。在砂土上DCD的剂量效应不明显,DCD用量从纯氮的1.0%增加到7.0%时,土壤中硝态氮含量仅增加1.9～10.7 mg.kg-1(培养30 d时);而在壤土和黏土中,土壤硝态氮含量随DCD浓度的增加而显著下降,存在明显剂量效应。这说明施用DCD可显著抑制新疆石灰性土壤的硝化作用过程,在砂土、壤土、黏土中DCD的最佳浓度分别为纯氮用量的6.0%、7.0%和7.0%,并在培养30 d内发挥显著作用。
英文摘要	Ammonium and nitrate are the main forms of available nitrogen(N)for plant.Nitrate is the dominant form of N in up-land soils in arid regions.However,nitrate can easily leach through soil profiles.Furthermore,N can easily be lost in the form of NOx via(de)nitrification.Inhibiting the processes of nitrification in soil through nitrification inhibitors is therefore critical for optimizing soil NH4+/NO3 ratio and improving the efficiency of N fertilizers.As one of the most common nitrification inhibitors,dicyandiamide(DCD)was applied at different rates(0%,1.0%,2.0%,3.0%,3.5%,4.0%,4.5%,5.0%,6.0% and 7.0% of applied N)in this study.And incubation experiment was conducted in sandy,loamy and clayey desert soils at 25 ?C to investigate the inhibition effect,dose-dependent effects of DCD on soil nitrification in arid regions.The study may further enhance our existing knowledge on the mechanisms of DCD inhibited nitrification.The results showed that during 30 days of incubation,DCD exhibited significant inhibi-tion effects on nitrification in all the tested soil types.Nitrification inhibition rates were 96.5%～99.4% in sandy soil,66.9%～85.6% in clayey soil and 49.3%～79.4% in loamy soil.For the three soil types,DCD nitrification inhibition efficacy was in the following order:sandy soil > clayey soil > loamy soil.When DCD application rate increased from 1.0% to 7.0% of applied nitrogen,nitrate concen-tration in sandy soil merely increased from 1.9 to 10.7 mg·kg 1.This suggested that DCD dose did not significantly affect nitrification in sandy soils.However,soil nitrate concentration in loamy and clayey soils decreased sharply with increasing rates of DCD,indi-cating significant dose effect on soil nitrification.In conclusion,DCD significantly inhibited soil nitrification in calcareous desert soils.The recommended optimum application rates of DCD in sandy,clayey and loamy soils were 6.0%,7.0% and 7.0% of applied nitrogen,respectively.
中文关键词	双氰胺 ; 硝化抑制剂 ; 硝态氮 ; 铵态氮 ; 硝化抑制率 ; 土壤质地
英文关键词	Dicyandiamide Nitrification inhibitor Nitrate nitrogen Ammonium nitrogen Nitrification inhibition rate Soil texture
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:4267842
来源机构	石河子大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/227593
作者单位	石河子大学农学院, 新疆生产建设兵团绿洲生态农业重点实验室, 石河子, 新疆 832003, 中国
推荐引用方式 GB/T 7714	刘倩,褚贵新,刘涛,等. DCD在不同质地土壤上的硝化抑制效果和剂量效应研究[J]. 石河子大学,2011,19(4):765-770.
APA	刘倩.,褚贵新.,刘涛.,王健.,冶军.,...&梁永超.(2011).DCD在不同质地土壤上的硝化抑制效果和剂量效应研究.中国生态农业学报,19(4),765-770.
MLA	刘倩,et al."DCD在不同质地土壤上的硝化抑制效果和剂量效应研究".中国生态农业学报 19.4(2011):765-770.