Dissimilatory nitrate reduction to ammonium (DNRA) plays an important role in soil nitrogen conservation in neutral and alkaline but not acidic rice soil
Dissimilatory nitrate reduction to ammonium (DNRA) plays an important role in soil nitrogen conservation in neutral and alkaline but not acidic rice soil
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硝酸盐异化还原铵（DNRA）对中性和碱性而非酸性水稻土的土壤氮保持具有重要作用
DOI：
10.1007/s11368-014-1037-7
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发表时间：
2015-03
影响因子：
3.6
通讯作者：
Cai Zucong
中科院分区：
文献类型：
--
作者：
Zhang Jinbo;Lan Ting;Mueller Christoph;Cai Zucong
目的水稻土干湿交替的环境条件和水稻根系的O2渗漏为DNRA、硝化、矿化和反硝化等氮素转化过程提供了有利的环境条件。由于硝化是一个不可避免的过程，为DNRA和其他NO3−损失途径提供可用的NO3−，因此假设硝化和DNRA之间存在关系是合乎逻辑的。因此，我们量化的特定的总氮转化率同时发生，以调查水稻土壤中的氮转化率之间的相关性。材料和方法在这项研究中，选择了三个不同pH值的水稻土。采用15 N示踪试验和数值模拟相结合的方法，结果与讨论结果表明，在中性条件下，水稻土中存在两条NH4+产生途径，即有机氮矿化途径和DNRA途径DNRA过程在酸性土壤（pH 4.7）中可以忽略不计。酸性土壤的矿化速率（2.69 mg kg−1d−1）显著高于中性和碱性土壤。在中性（pH 6.2）和碱性（pH 8.2）土壤中，DNRA速率分别为0.48和1.09 mg kg−1d−1，几乎等于矿化速率，有效地抵消了低矿化对生态系统氮素有效性的影响。DNRA速率随总硝化速率的增加而线性增加（p< 0.05）。DNRA和硝化作用之间的这种显着的耦合关系有利于水稻生长在nitricosystem.ConclusionsDNRA土壤氮素的保护和有效性发挥了重要作用，在中性和碱性，但不是酸性水稻土。
PurposeIn the rice soils, the alternate wetting and drying conditions and the leakage of O2from rice roots provides a favorable environment for many N transformation processes, such as DNRA, nitrification, mineralization, and denitrification. Since nitrification is an inevitable process providing available NO3−for DNRA and other NO3−loss pathways, it is logical to hypothesize that a relationship exists between nitrification and DNRA. Thus, we quantified the specific gross N transformation rates occurring simultaneously to investigate the correlation among the N transformation rates in the rice soil.Material and methodsIn this study, three rice soils with different pH values were selected. The combination of15N tracing experiment and numerical modeling method was performed to quantify the specific gross N transformation rates (e.g., DNRA), to analyze the correlation between DNRA and the other N transformations, and to estimate the functional role of DNRA comparing to other N transformation in the rice soil.Results and discussionThe results showed that there were two NH4+production pathways, organic N mineralization and DNRA, in the neutral (pH 6.2) and alkaline (pH 8.2) soils, while the DNRA process was negligible in acidic soil (pH 4.7). The mineralization rate in the acidic soil (2.69 mg kg−1d−1) was significantly higher than that in neutral and alkaline soils. The DNRA rate was 0.48 and 1.09 mg kg−1d−1, which was almost equal to the mineralization rate, in the neutral (pH 6.2) and alkaline (pH 8.2) soils, offsetting efficiently the effect of low mineralization on N availability in ecosystems. The DNRA rate linearly increased with the increase in gross nitrification rate (p< 0.05). This significant coupling relationship between DNRA and nitrification favors N conservation and availability for paddy growth in the rice ecosystem.ConclusionsDNRA plays an important role in soil N conservation and availability in neutral and alkaline but not acidic rice soil.
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影响因子：
9.7
作者：
S.X Yin;D. Chen;L.M Chen;R. Edis
通讯作者：
S.X Yin;D. Chen;L.M Chen;R. Edis
影响因子：
2.9
作者：
K. R. Reddy;W. H. Patrick
通讯作者：
K. R. Reddy;W. H. Patrick
中国东部不同气候梯度森林土壤的氮循环
影响因子：
4.9
作者：
Zhang, Jinbo;Zhang, Jinbo;Zhu, Tongbin;Zhu, Tongbin;Cai, Zucong;Cai, Zucong;Mueller, Christoph;Mueller, Christoph
通讯作者：
Mueller, Christoph
农业土地利用影响中国湿润亚热带土壤硝酸盐的产生和保存
影响因子：
9.7
作者：
Yang Jiajia;Yang Wenyan;Mueller Christoph;Cai, Zucong
通讯作者：
Cai, Zucong
DOI：
10.2136/sssaj1984.03615995004800060013x
发表时间：
1984-01-01
影响因子：
2.9
作者：
LINN, DM;DORAN, JW
通讯作者：
DORAN, JW