基于CT扫描研究青海湖流域高寒草甸不同坡位土壤大孔隙结构特征
作者:
作者单位:

北京师范大学环境演变与自然灾害教育部重点实验室,北京师范大学环境演变与自然灾害教育部重点实验室

作者简介:

通讯作者:

中图分类号:

S157.1

基金项目:

国家自然科学基金项目(41471018)和国家自然科学基金重点项目(41130640)资助


Soil Macropores of Alpine Kobresia Meadow in Different Slope Positions in the Qinghai Lake Watershed
Author:
Affiliation:

Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education,Beijing Normal University,Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education,Beijing Normal University

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    以青海湖流域的高寒草甸土壤为研究对象,对该高寒草甸的坡上、坡中和坡下土壤分别取原状土柱进行CT扫描,利用Fiji 软件分析土壤大孔隙结构特征的差异。结果表明:坡位对土壤的大孔隙结构有较大影响,坡上土壤的大孔隙数量、大孔隙度和大孔隙等效直径均大于坡中土壤,坡中土壤的大孔隙参数大于坡下土壤,坡上土壤的平均大孔隙度是坡中和坡下土壤的15.5和46.5倍。坡上土壤的大孔隙主要分布在150 ~ 400 mm 土层深度,而坡中土壤的大孔隙主要分布在0 ~ 150 mm深度,坡下土壤的大孔隙主要在0 ~ 200 mm深度分布。坡上和坡中土壤的大孔隙形成主要是在土壤团聚体的作用下形成,植物根系在坡下土壤的大孔隙形成中占主导作用。

    Abstract:

    The objective of this study is to quantify macropore structures of Alpine Kobresia meadow soils in different slope positions in the Qinghai Lake Watershed. A total of nine soil cores (0–50 cm deep) were taken respectively at the upper-slope, mid-slope and lower-slope sites with 3 replicates in each site, and the cores were scanned with a GE HISPEED FX/I medical scanner. Numbers of macropores, macroporosities and macropore equivalent diameters were interpreted by using X-ray computed tomography. The results indicated that slope position could significantly influence soil macropores. Soils on upper-slope had greater macroporosity, deeper and longer macropores than other two sites. Macroporosity was 15.5–46.5 times greater in soils on upper-slope than other two sites, and macropores were distributed mainly in the 150–400 mm layer, but mainly in the 0–150 mm and 0–200 mm soil layer in the mid-slope and the lower-slope, respectively. The form of macropores in lower slope can be attributed to root growth and decay, while can be attributed to aggregate function in the upper and middle slopes.

    参考文献
    相似文献
    引证文献
引用本文

胡 霞,李宗超,刘 勇,孙贞婷,吕艳丽.基于CT扫描研究青海湖流域高寒草甸不同坡位土壤大孔隙结构特征[J].土壤,2016,48(1):180-185. HU Xia, LI Zong-chao, LIU Yong, SUN Zhen-ting, LV Yan-li. Soil Macropores of Alpine Kobresia Meadow in Different Slope Positions in the Qinghai Lake Watershed[J]. Soils,2016,48(1):180-185

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2015-05-20
  • 最后修改日期:2015-09-16
  • 录用日期:2015-11-02
  • 在线发布日期: 2015-12-29
  • 出版日期: 2016-02-25