• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Waste management & research >Nitrogen mineralization and nitrate leaching of a sandy soil amended with different organic wastes
【24h】

Nitrogen mineralization and nitrate leaching of a sandy soil amended with different organic wastes

机译：沙质土壤中的氮矿化和硝态氮淋溶，其中土壤中掺入了有机废物

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Organic wastes can be recycled as a source of plant nutrients, enhancing crop production by improving soil quality. However, the study of the dynamic of soil nutrient, especially the N dynamic, after soil application of any organic material is vital for assessing a correct and effective use of the material, minimizing the losses of nitrate in leachates and avoiding the negative environmental effects that it may cause in groundwater. To estimate the effect of three organic materials, a municipal solid waste compost (MWC), a non-composted paper mill sludge (PS), and an agroforest compost (AC) on the N dynamic of a sandy soil two experiments were carried out: an incubation experiment and a column experiment. The incubation experiment was conducted to estimate the N mineralization rate of the different soil-amendment mixtures. The soil was mixed with the organic amendments at a rate equivalent to 50 000 kg ha~(-1) and incubated during 40 weeks at constant moisture content (70 percent of its water-holding capacity) and temperature (28 deg C) under aerobic conditions. Organic amendment-soil samples showed an immobilization of N during the first weeks, which was more noticeable and longer in the case of PS-treated soil compared to the other two amendments due to its high C/N ratio. After this immobilization stage, a positive mineralization was observed for all treatment, especially in MWC treated soil. Contemporaneously a 1-year column (19 cm diameter and 60 cm height) experiment was carried out to estimate the nitrate losses from the soil amended with the same organic materials. Amendments were mixed with the top soil (0-15 cm) at a rate equivalent to 50 000 kg ha~(-1). The columns were periodically irrigated simulating rainfall in the area of study, receiving in total 415 mm of water, and the water draining was collected during the experimental period and analysed for NO_3-N. At the end of the experimental period NO_3-N content in soil columns at three depths (0-20, 20--35 and 35--50 cm) was determined. The nitrate concentration in drainage water confirmed the results obtained in the incubation experiment: nitrate leaching was higher in soil treated with MWC due to its higher N-mineraliza-tion rate. Nevertheless, the nitrate losses represented a low amount compared with the total nitrogen added to soil. No clear signs of water-draining contamination were observed during the first year after the application of AC and PS; however, the nitrate leaching in soil treated with MWC slightly exceeded the limit allowed for the Drinking Water Directive 98/83/CE.
机译：可以将有机废物作为植物养分的来源进行回收，通过改善土壤质量来提高作物产量。但是，在土壤中施用任何有机材料后，研究土壤养分的动力学，尤其是氮的动力学，对于评估材料的正确和有效使用，最大程度地减少渗滤液中硝酸盐的流失以及避免负面的环境影响至关重要。它可能导致地下水。为了评估三种有机材料，城市固体废物堆肥（MWC），非堆肥造纸厂污泥（PS）和农林堆肥（AC）对沙土氮素动态的影响，进行了两个实验：孵育实验和色谱柱实验。进行温育实验以估计不同土壤改良剂混合物的氮矿化率。将土壤与有机改良剂以相当于50000 kg ha〜（-1）的速率混合，并在有氧条件下（恒定持水量的70％）和温度（28摄氏度）下恒定湿度下培养40周条件。有机改质土壤样品在最初的几周内显示出N的固定化，由于PS处理过的土壤具有较高的C / N比，因此与其他两种改质相比，其显着且更长。在固定化阶段之后，所有处理都观察到了积极的矿化作用，尤其是在MWC处理过的土壤中。同时进行了为期1年（直径19厘米，高60厘米）的色谱柱实验，估算了用相同有机材料改良的土壤中的硝酸盐损失。将改良剂与表层土壤（0-15厘米）混合，混合量相当于5万公斤ha-1（-1）。在研究区域内定期灌溉柱子以模拟降雨，总共接收415毫米的水，在实验期间收集排水并分析NO_3-N。在试验期结束时，确定了三个深度（0-20、20--35和35--50 cm）的土壤柱中的NO_3-N含量。排水中的硝酸盐浓度证实了在温育实验中获得的结果：由于MWC处理过的土壤具有较高的N矿化率，因此其硝酸盐淋失较高。然而，与添加到土壤中的总氮相比，硝酸盐的损失量很小。使用AC和PS后的第一年，没有观察到明显的排水污染迹象。但是，用MWC处理过的土壤中的硝酸盐浸出略超过了饮用水指令98/83 / CE所允许的极限。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号