Nitrous oxide and methane emissions during rice growth and through rice plants: effect of dicyandiamide and hydroquinone
Nitrous oxide and methane emissions during rice growth and through rice plants: effect of dicyandiamide and hydroquinone
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DOI：
10.1007/s00374-002-0503-3
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发表时间：
2002-08
影响因子：
6.5
通讯作者：
Xu X.;Boeckx P.;Wang Y.;Huang Y.;Zheng X.;H. F.;O. Van Cleemput
中科院分区：
文献类型：
--
作者：
Xu X.;Boeckx P.;Wang Y.;Huang Y.;Zheng X.;H. F.;O. Van Cleemput
人们对N2 O和CH 4通过水稻植物的运输越来越感兴趣，但关于抑制剂对水稻生长期间和通过水稻植物的这些气体排放的影响的信息却很少。采用密闭箱法研究了尿素酶抑制剂对苯二酚（HQ）和硝化抑制剂双氰胺（DCD）对N2 O和CH 4排放的影响。随着水稻的生长，所有处理水稻植株的N2 O排放量均显著降低;抑制剂存在时的N2 O排放量始终低于不存在抑制剂时的N2 O排放量。这些变异与鲜稻植株NO_3 ~--N含量的变异一致。在水稻生长期间，水稻植株中NO_3 ~--N含量的增加抑制了水稻植株N_2O排放的增加。因此，水稻幼苗中的NO3--N对植物介导的N2 O通量有很大贡献。水稻植株在旺盛生长期排放大量的CH 4，抑制剂存在时CH 4排放量总是低于不存在时。在本试验条件下，施用双氰胺，尤其是双氰胺+HQ能显著促进水稻生长，减少水稻生长过程中N2 O和CH 4的排放。
There is growing interest in N2O and CH4transport through rice plants, but very little information is available on the effects of inhibitors on these gaseous emissions during rice growth and through rice plants. The closed chamber technique was used to study the effect of the urease inhibitor hydroquinone (HQ) and the nitrification inhibitor dicyandiamide (DCD) on N2O and CH4emissions. As rice plants grew, the N2O emission through rice plants was significantly reduced in all treatments; N2O emissions were always lower in the presence than in the absence of inhibitor(s). These variations paralleled those in NO3–-N content of fresh rice plants. During the rice growth period, increasing NO3–-N content in rice plants paralleled the increase in the N2O emission through rice plants. Hence, NO3–-N in young rice plants can substantially contribute to the plant-mediated N2O flux. A substantial CH4emission through rice plants occurred at their vigorous growth stage; CH4emissions were always lower in the presence than in the absence of inhibitor(s). Under the experimental conditions, application of DCD, especially of DCD+HQ, could significantly improve the growth of rice, and reduce the emissions of N2O and CH4during rice growth.