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首页> 外文期刊>Indian medical journal >Nitrous oxide emissions as influenced by legume cover crops and nitrogen fertilization
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Nitrous oxide emissions as influenced by legume cover crops and nitrogen fertilization

机译：由豆类覆盖作物和氮肥影响的氧化氮排放量

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In this study, we measured nitrous oxide (N~(2)O) fluxes from plots of fall-planted hairy vetch (HV, Vicia villosa ) and spring-planted broadleaf vetch (BLV, Vicia narbonensis ) grown as nitrogen (N) sources for following summer forage crabgrass ( Digitaria sanguinalis ). Comparisons also included 60?kg?ha_(?1)inorganic N fertilizer for crabgrass at planting (60-N) and a control without N fertilizer. Each treatment had six replicated plots across the slope. Fluxes were measured with closed chamber systems during the period between spring growth of cover crops and first-cut of crabgrass in mid-July. HV had strong stand and aboveground biomass had 185?±?50?kg?N?ha_(?1)(mean?±?standard error, n ?=?6) at termination. However, BLV did not establish well and aboveground biomass had only 35?±?15?kg?N?ha_(?1). Ratio vegetation index of crabgrass measured as proxy of biomass growth was highest in HV treatment. However, total aboveground biomass of crabgrass was statistically similar to 60-N plots. Fluxes of N~(2)O were low prior to termination of cover crops but were as high as 8.2?kg N~(2)O?ha_(?1)?day_(?1)from HV plots after termination. The fluxes were enhanced by large rainfall events recorded after biomass incorporation. Rainfall enhanced N~(2)O fluxes were also observed in other treatments, but their magnitudes were much smaller. The high N~(2)O fluxes from HV plots contributed to emissions of 30.3?±?12.4?kg?N~(2)O?ha_(?1)within 30?days of biomass incorporation. Emissions were only 2.0?±?0.7, 3.4?±?1.3 and 1.0?±?0.4?kg N~(2)O?ha_(?1)from BLV, 60-N and control plots, respectively.
机译：在这项研究中，我们从植物毛茸茸瓦茨（HV，VICIA villosa）和春天种植的阔叶（BLV，VICIA NARBONENSIS）中的氧化氮（N〜（2）o）助焊剂作为氮气（n）来源对于以下夏季牧草蟹（Digitaria sanguinalis）。比较也包括60？kg？ha _（α1）无机N肥料用于种植（60-n）和没有n肥料的对照。每个治疗在坡度上有六个复制的曲线。在7月中旬在封面作物的春季生长和首次切割的蟹肉之间的春季生长期间，用闭合室系统测量助熔剂。 HV具有强大的支架和地上的生物量有185？±50？kg？n？ha _（α1）（平均值？±2）在终止时终止。然而，BLV没有建立良好，地上的生物质只有35？±15？kg？n？ha _（？1）。 Crabgrass的比率指数测量为生物质生长的代理在HV处理中最高。然而，Crabgrass的总面积生物质统计学上类似于60-N的图。 N〜（2）o的助焊剂在封面作物终止之前较低，但高达8.2×kg n〜（2）o o？ha _（α1）？终止后HV图的日_（α1）。通过生物量掺入后记录的大雨事件增强了助液。在其他治疗中也观察到降雨增强N〜（2）O助体，但它们的大小较小。 HV图中的高N〜（2）O助熔剂导致30.3°的排放为30.3°？12.4Ω·kg？n〜（2）o？ha _（α1）在30？天的生物量掺入中。排放仅为2.0？±0.7,3.4？±1.3和1.0？±0.4Ω·kg n〜（2）O？HA _（α1），分别来自BLV，60-N和控制图。

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