• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>other >Identification of soil P fractions that are associated with P loss from surface runoff under various cropping systems and fertilizer rates on sloped farmland
【2h】

Identification of soil P fractions that are associated with P loss from surface runoff under various cropping systems and fertilizer rates on sloped farmland

机译：识别与不同耕作制度和坡耕地施肥速率下地表径流磷损失相关的土壤磷组分

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Soil phosphorus (P) fractions and runoff P concentration were measured to understand the fate of soil P entering surface runoff water during summer cropping season of different double cropping systems under two fertilizer regimes. The dominant form of runoff P was particulate P (PP). Runoff total P (TP) was higher at the vegetative growth stage and lower at the crop reproductive stage. TP and PP were derived mainly from soil Olsen-P, Al-P and Fe-P and amounts increased with sediment content in runoff water. Runoff P discharge was closely related to the changes in soil P forms. Soil Olsen-P, mainly consisting of some Ca2-P and Al-P, was increased by elevating fertilizer rate. Along with crop growth, there were active interconversions among Olsen-P, Org-P, Fe-P and O-Al-P in the soil, and some available P converted into Ca10-P, with O-Fe-P possibly being a transitional form for this conversion. The oilseed rape/corn system had less runoff TP at the early stage, and wheat/sweet potato system had a lower runoff P at the late stage. Intercropping corn with sweet potato in the field with oilseed rape as a previous crop may be helpful for alleviating runoff P load during the summer in this region.
机译：测量土壤磷（P）含量和径流磷浓度，以了解在两种肥料制度下不同双季种植系统的夏季播种季节土壤磷进入地表径流水中的命运。径流P的主要形式是颗粒P（PP）。在营养生长阶段，径流总磷（TP）较高，而在作物繁殖阶段，径流总磷较低。 TP和PP主要来源于土壤Olsen-P，Al-P和Fe-P，其含量随径流水中的沉积物含量增加而增加。径流磷的排放与土壤磷形态的变化密切相关。通过提高肥料用量可以增加土壤Olsen-P（主要由一些Ca2-P和Al-P组成）。随着作物的生长，土壤中的Olsen-P，Org-P，Fe-P和O-Al-P之间发生了有效的相互转化，一些有效的P转化为Ca10-P，O-Fe-P可能是一种此转换的过渡形式。油菜/玉米系统在早期的径流TP较小，而小麦/红薯系统在后期的径流P较低。玉米和甘薯在田间套种，以油菜作为前茬，可能有助于减轻该地区夏季的径流磷负荷。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

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