• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>2010 International conference of international conference on combating land degradation in agricultral areas. >Runoff Nutrients Losses and Particle Size Distribution of Eroded Sediments as Affected by Rainfall Intensity on Loess Plateau
【24h】

Runoff Nutrients Losses and Particle Size Distribution of Eroded Sediments as Affected by Rainfall Intensity on Loess Plateau

机译：黄土高原降雨强度对侵蚀沉积物径流养分流失及粒径分布的影响

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

Soil erosion is a serious problem of worldwide concern. Rainfall intensity is an important factor affecting soil erosion and the resulting nutrients loss. Field experiments were conducted to investigate the effect of rainfall intensity (60, 100 and 140 mm/h) on runoff nutrients loss and sediment particles size distribution under simulated rainfall conditions. The results showed that rainfall intensity had a significant effect on runoff, sediment and the associated nutrients loss. In general, higher rainfall intensity led to higher runoff nutrients loss. Furthermore, the nutrients mostly lost through sediment instead of runoff water. Inorganic nitrogen loss was mainly due to runoff, primarily in the form of NO3-N. Positive linear relationships existed between soil loss and nutrients loss. Rainfall intensity had more significant effects on enrichment ratio of nitrogen (ERN) than that of organic matter (EROM) and phosphorus (ERP). Compared with the original surface soil, the sediment contained more fine particles (<20 μm). The clay content significantly decreased with increasing rainfall intensity (p<0.05). ER of sediment-bound nutrients was positively correlated with ER of particles smaller than 2 μm. This suggested that the clay fraction (<2 μm) was preferentially eroded and soil nutrients were mainly adsorbed on or contained within this part of particles.
机译：水土流失是全世界关注的严重问题。降雨强度是影响土壤侵蚀和养分流失的重要因素。进行了野外试验，以研究降雨强度（60、100和140 mm / h）对模拟降雨条件下径流养分流失和沉积物粒径分布的影响。结果表明，降雨强度对径流，沉积物及相关养分流失具有显着影响。通常，较高的降雨强度导致较高的径流养分流失。此外，养分主要通过沉积物而不是径流水而流失。无机氮的损失主要是径流引起的，主要是NO3-N的形式。土壤流失与养分流失之间存在正线性关系。降雨强度对氮（ERN）富集率的影响比有机物（EROM）和磷（ERP）的影响大。与原始表层土壤相比，沉积物包含更多的细颗粒（<20μm）。粘土含量随降雨强度的增加而显着降低（p <0.05）。与沉积物结合的营养素的ER与小于2μm的颗粒的ER呈正相关。这表明粘土部分（<2μm）被优先侵蚀，而土壤养分主要吸附在这部分颗粒上或包含在其中。

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