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首页> 外文期刊>Plant and Soil >C-13 isotopic discrimination: a starting point for new insights in competition for nitrogen and water under contour hedgerow systems in tropical mountainous regions
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C-13 isotopic discrimination: a starting point for new insights in competition for nitrogen and water under contour hedgerow systems in tropical mountainous regions

机译：C-13同位素歧视：在热带山区轮廓树篱系统下争夺氮与水的新见解的起点

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摘要

Competition for nutrients and water between crops and associated hedgerows reduces overall performance of contour hedgerow systems and hampers its acceptance by rural communities in tropical mountainous regions. Therefore, it is imperative to better understand competition leading to a decline in crop response close to hedges. In the highlands of North East Thailand spatial variability in grain yield of maize (Zea mays L., cv. Suwan 1) was assessed for two contour hedgerow systems based on Brachiaria ruziziensis Germain et Evrard (Ruzi grass) barriers or Leucaena leucocephala (Lam) de Wit hedges without or with fertilizer (60 kg N ha(-1) and 14 kg P ha(-1)). Available NO- (3) - N was analyzed across the slope. In addition, shoot N concentration and delta C-13 values in leaves were measured for maize plants in the center of the alley and in the row next to and at the upper side of barriers or hedges. Despite variable field conditions, delta C-13 values were significantly (p < 0.05) less depleted close to the barriers or hedges, except for 2 out of 16 plots, suggesting that water deficiency was not the main driver for spatial variability along the alleys. The negative correrlatiom betweem C-13 isotopic discrimination and available NO- (3) - N in the soil, with R-2 ranging from 0.5 (p < 0.10) to 0.9 (p < 0.01), assigned a major role to N availability in the reduced crop response towards the barriers. The proposed framework of C-13 isotopic discrimination, together with plant and soil N data, is a new approach and was shown to be suitable to determine N and water competition between hedgerows and crops grown in alleys under field conditions.
机译：作物和相关树篱之间争夺养分和水分的竞争降低了轮廓树篱系统的整体性能，并阻碍了热带山区农村社区对其的接受。因此，必须更好地理解竞争导致接近对冲的作物响应下降的竞争。在泰国东北部的高地上，针对两个等高的篱笆栅栏系统，评估了玉米（Zea mays L.，cv。Suwan 1）的谷物产量空间变异性。不带或带肥料的德威特树篱（60千克N ha（-1）和14千克P ha（-1））。有效NO-（3）-N在整个坡度上进行了分析。另外，在小巷中心以及在栅栏或树篱旁边和上侧的行中，测量了玉米植株的茎叶N浓度和ΔC-13值。尽管田间条件不同，但在16个地块中有2个除外，靠近障碍或树篱的C-13值显着减少（p <0.05），这表明缺水并不是小巷空间变异的主要驱动力。 C-13同位素判别和土壤中可用的NO-（3）-N之间呈负相关，R-2的范围从0.5（p <0.10）到0.9（p <0.01），在土壤中氮的有效利用中起着重要作用。作物对障碍的反应减少。提议的C-13同位素判别框架以及植物和土壤的N数据，是一种新方法，被证明适合确定田间条件下小巷中生长的树篱和农作物之间的N和水竞争。

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