首页> 外文期刊>Soil Science >Erosion patterns on cultivated and uncultivated hillslopes determined by soil fly ash contents.
【24h】

Erosion patterns on cultivated and uncultivated hillslopes determined by soil fly ash contents.

机译:由土壤粉煤灰含量确定的耕地和非耕地山坡的侵蚀方式。

获取原文
获取原文并翻译 | 示例
获取外文期刊封面目录资料

摘要

The extent of soil removal from a hillslope as a result of accelerated erosion and its subsequent deposition on a lower landscape position were determined using the presence, depth distribution, and concentration of fly ash, organic carbon, and magnetic susceptibility to identify the remaining original soil as well as a sediment marker. The study was carried out by comparing the amount of fly ash contained in the soil profile at different landscape positions of a cultivated site with that in an uncultivated woodland site. Fly ash deposition began in 1855 with traffic on the Illinois Central Railroad between Chicago and Cairo, Illinois, USA. In 1889 and 1928, additional rail lines were located closer to both sites. Organic C, magnetic-mineral content, and magnetic susceptibility decreased regularly with depth at both sites. Magnetic susceptibility was generally higher on the uncultivated site compared with the cultivated site for all landscape positions except the lower footslope. Compared with the uncultivated site, there was 50% less fly ash on interfluve and shoulder landscape segments of the cultivated site, 35% less on the backslope, and 67% less on the depositional lower footslope position. When the entire transect site is considered, the cultivated site had 47% less fly ash in the upper 22.5-cm soil profile compared with the uncultivated site. These results indicated that 10.6 cm (47%) of the upper soil layer has been eroded from the hillslope since 1855 (142 years) as a result of accelerated erosion induced by cultivation. For the backslope, the presence of 65% (15 cm) of the original surface soil layers and 67% of the fly ash at the cultivated site places the soil in the moderately eroded phase of the Grantsburg soil.
机译:使用飞灰,有机碳和磁化率的存在,深度分布和浓度来确定残留的原始土壤,从而确定由于加速侵蚀而从山坡上清除土壤的程度及其随后在较低景观位置上的沉积以及沉积物标记通过比较耕地和未耕地林地不同景观位置土壤剖面中飞灰的含量进行了研究。粉煤灰的沉积始于1855年,当时伊利诺伊州中央铁路在芝加哥和美国伊利诺伊州的开罗之间通行。 1889年和1928年,又有两条铁路线靠近这两个站点。在两个位置,有机碳,矿物质含量和磁化率均随深度而定期下降。与除较低山脚坡以外的所有景观位置的耕地相比,未耕地的磁化率通常较高。与未耕地相比,耕地的河道间和肩部景观段上的粉煤灰减少了50%,后坡地上的飞灰减少了35%,而下坡地段的沉积减少了67%。当考虑整个样地时,与未耕地相比,耕地的上部22.5厘米土壤剖面中的粉煤灰少47%。这些结果表明,自1855年(142年)以来,由于耕种加速侵蚀,上部土壤层已从山坡上侵蚀了10.6厘米(47%)。对于后坡,耕地上原始土壤表层的65%(15厘米)和粉煤灰的67%将土壤置于Grantsburg土壤的中等侵蚀阶段。

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