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首页> 外文期刊>Turkish Journal of Agriculture & Forestry >Study on vertical and lateral leaching of nitrate from a wheat field in China.
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Study on vertical and lateral leaching of nitrate from a wheat field in China.

机译：中国麦田硝态氮垂直和横向淋溶研究。

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Vertical and lateral leaching of nitrate from a wheat field was studied through one season in a field in Jiaxing City, Zhejiang, China by applying increasing amount of N fertilizers (e.g. 90, 180, 270 and 360 kg ha-1). Results showed that nitrate leaching was the dominating way of nitrate loss from wheat land during the first two month after sowing seeds. After irrigation, the nitrate concentration in the leachate of 30 cm soil layer was higher than that of 60 cm, while the concentration of nitrate leaching in the five N treatments through the two depth soil layer showed the same level with the value of 13.48 to 27.91 mg litre-1 for 30 cm soil layer and 16.48 to 28.65 mg litre-1 for 60 cm soil layer, respectively. With regards to the plot scale (20 m2), the amount of nitrate loss varied from 101.13 to 209.35 mg litre-1 for 30 cm and from 123.63 to 214.89 mg litre-1 for 60 cm. Peak nitrate concentration was 3.47 mg litre-1 during the third rainfall event. However, nitrate loss by lateral leaching in subsoil was less than that by vertical leaching. At a distance of 0.5 m from one side of each plot, the highest nitrate concentrations in lateral leachate among the plots was 10.75 mg litre-1 and the maximum nitrate loss was 13.43 mg litre-1. By comparison of nitrate concentration in two position of 0.5 and 1.5 m from one side of each plot, the horizontal movement of nitrate in shallow subsoil could be negative. Based on these results, it was suggested that the vertical leaching of nitrate had a greater pollution potential to water body than the lateral leaching during the wheat growth period in the fields..
机译：在浙江嘉兴市的一个田地，研究了硝态氮垂直和横向浸出的过程，研究了一个季节，通过增加氮肥的用量（例如90、180、270和360 kg ha-1）。结果表明，在种子播种后的前两个月中，硝酸盐淋失是小麦土地上硝酸盐流失的主要方式。灌溉后，30 cm土壤层渗滤液中的硝酸盐浓度高于60 cm，而在5个氮处理中，通过两个深度土壤层渗滤液中的硝酸盐浓度均处于相同水平，值为13.48至27.91。 30厘米土壤层的毫克升-1和60厘米土壤层的16.48至28.65毫克升-1。关于样地规模（20平方米），硝酸盐损失量在30厘米范围内从101.13到209.35 mg升-1，在60厘米范围内从123.63到214.89 mg升-1变化。在第三次降雨事件中，硝酸盐峰值浓度为3.47 mg litre-1。然而，在底土中侧向淋溶的硝酸盐损失要小于垂直淋溶的损失。在距每个样区的一侧0.5 m的距离内，样区中侧向渗滤液中的最高硝酸盐浓度为10.75 mg升-1，最大硝酸盐损失为13.43 mg升-1。通过比较距每个样区一侧0.5和1.5 m的两个位置的硝酸盐浓度，浅层地下土壤中硝酸盐的水平运动可能为负。根据这些结果，认为在田间小麦的垂直生长过程中，硝酸盐的垂直淋洗对水体的污染潜力大于横向淋溶。

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