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首页> 外文期刊>Journal of plant nutrition and soil science >Soil nitrous oxide emissions from grassland: Potential inhibitor effect of hippuric acid
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Soil nitrous oxide emissions from grassland: Potential inhibitor effect of hippuric acid

机译：草原土壤中氮氧化物排放量：羊皮酸的潜在抑制作用

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In grassland systems, cattle and sheep urine patches are recognized as nitrous oxide (N2O) emission hot spots due to the high urinary nitrogen (N) concentrations. Hippuric acid (HA) is one of the constituents of ruminant urine that has been reported as a natural inhibitor of soil N2O emissions. The aim of this study was to examine the potential for elevated ruminant urine HA concentrations to reduce N2O emissions, in situ, on an acidic heavy clay soil under poorly drained conditions (WFPS 85%). A randomized complete block design experiment with three replications and four treatments was conducted using the closed-static-flux chamber methodology. The four treatments were applied inside the chambers: control with no artificial urine application (C), control artificial urine (U), and enriched artificial urine with two rates of HA (55.8 and 90mM, U+HA1, U+HA2). Soil inorganic-N, soil dissolved organic carbon (DOC), soil pH as well as N2O and methane (CH4) fluxes were monitored over a 79-d period. Although N2O emissions were not affected by the HA enriched urine treatments, U+HA2 positively affected the retention of N as NH4+ until day 3, when the soil pH dropped to values 5. Subsequently, as a consequence of rainfall events and soil acidification, it is likely that leaching or sorption onto clay reduced the efficacy of HA, masking any treatment differential effect on N2O emissions. Moreover, CH4 fluxes as well as DOC results reflected the soil anaerobic conditions which did not favour nitrification processes. Further research is needed to determine the fate of HA into the soil which might clarify the lack of an in situ effect of this compound.
机译：在草原系统中，由于高尿氮（N）浓度，牛和绵羊尿蛋白被认为是氧化氮（N2O）发射热点。海皮酸（HA）是反刍动物尿的成分之一，其被报告为土壤N2O排放的天然抑制剂。本研究的目的是检查升高的反刍动物尿HA浓度的可能性，以在耐排水的条件下（WFPS＆ 85％）在酸性重粘土土壤上降低N2O排放。使用闭合静态通量室方法进行三种复制和四种处理的随机完全块设计实验。将四种处理施加在室内：没有人工尿液施用（c），控制人工尿液（U），并富含人工尿液，具有两个HA（55.8和90mm，U + Ha1，U + Ha2）。在79-D期间监测土壤无机-N，土壤溶解有机碳（DOC），土壤pH和N2O和N 2 O和甲烷（CH 4）助熔剂。虽然N 2 O排放不受HA富集的尿液处理的影响，但是当土壤pH降至值＆随后，由于降雨事件和土壤酸化，浸出或吸附可能在粘土上降低了HA的功效，掩盖了对N2O排放的任何治疗差异效果。此外，CH 4助焊剂以及DOC结果反映了不赞成硝化过程的土壤厌氧条件。需要进一步的研究来确定HA的命运进入土壤中，这可能阐明该化合物的原位效应缺乏。

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