根系对浅表层土大孔隙分布特征及饱和渗透性的影响

祁子寒; 王云琦; 王玉杰; 李通; 王余靖; 何相昌

doi:10.13870/j.cnki.stbcxb.2021.05.014

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根系对浅表层土大孔隙分布特征及饱和渗透性的影响

更新时间：2025-03-12

- 根系对浅表层土大孔隙分布特征及饱和渗透性的影响
- Effect of Root System on Macropores Distribution and Saturated Permeability of Surface Soil
- 水土保持学报 2021年35卷第5期页码：94-100
- 作者机构：
  
  1. 北京林业大学水土保持学院重庆三峡库区森林生态系统教育部野外科学观测研究站,北京,100083
  2. 北京林业大学水土保持学院重庆缙云山三峡库区森林生态系统国家定位观测研究站,北京,100083
- 作者简介：
  
  [ "祁子寒(1996-),男,硕士,主要从事水土保持工程研究。E-mail:qizihanyx@163.com" ]
- 基金信息：
  
  国家自然科学基金项目（31971726）
- DOI：10.13870/j.cnki.stbcxb.2021.05.014
  中图分类号： S152.5
- 纸质出版：2021
- 稿件说明：
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祁子寒, 王云琦, 王玉杰, 等. 根系对浅表层土大孔隙分布特征及饱和渗透性的影响[J]. 水土保持学报, 2021,35(5):94-100.

QI Zihan, WANG Yunqi, WANG Yujie, et al. Effect of Root System on Macropores Distribution and Saturated Permeability of Surface Soil[J]. 2021, 35(5): 94-100.
祁子寒, 王云琦, 王玉杰, 等. 根系对浅表层土大孔隙分布特征及饱和渗透性的影响[J]. 水土保持学报, 2021,35(5):94-100. DOI： 10.13870/j.cnki.stbcxb.2021.05.014.

QI Zihan, WANG Yunqi, WANG Yujie, et al. Effect of Root System on Macropores Distribution and Saturated Permeability of Surface Soil[J]. 2021, 35(5): 94-100. DOI： 10.13870/j.cnki.stbcxb.2021.05.014.

摘要

根系的存在对土壤大孔隙的产生及渗透特性有着重要影响，为研究浅表层土体中根系生物量与土壤大孔隙特征之间的数值关系，在缙云山针阔混交林中选取杉木单株植物根际土体为研究对象，进行染色示踪试验及根系生物量测量，取样后在室内采用自制定水头装置进行水分穿透试验和渗透试验。结果表明：（1）不同土壤剖面和不同土层深度的土壤染色面积不同，距离树木主干位置越远的剖面染色面积越大，而距离主干位置越近的剖面染色面积越小，且随着土层深度的增加整体上每个剖面上染色面积比均下降；（2）4个剖面整体表现出随土层深度的增加根系数量减少的趋势，根系直径主要集中在0.2~10 mm，且0.2~1 mm径级的根系较多；（3）染色区较未染色区具有更大的稳定出流速率，4个剖面染色区的出流速率分别为未染色区的1.97，1.81，1.77，1.70倍，且随着土层深度的增加大孔隙数量减少，大孔隙的半径分布范围在0.3~1.7 mm；（4）大孔隙度和根系生物量与渗透系数呈正相关关系，大孔隙度决定了渗透系数94.5%的变异，根系生物量决定了渗透系数87.4%的变异。

Abstract

Root system plays an important role in the formation and permeability of soil macropores. Aiming to clarify the numerical relationship between root biomass distribution and soil macropores characteristics

a naturally grown Chinese fir in JinYun mountain was selected as research object. The macropore area and root distribution characteristics on 4 dye tracing treated soil profiles in field were observed

and then a series of water penetration tests were conducted using self-designed constant head device for soil sampling in dyed and undyed zone in Lab. Results showed that:(1) The dyed area of soil was different for different soil profiles and different soil depths. The farther away from the trunk of the tree

the larger the dyed area

while the closer to the trunk

the smaller the dyed area

and the overall depth increased. The dyed area ratio of each section above all decreased. (2) The four soil profiles mainly showed a trend of decreasing root coefficient with the increasing soil depths. The root diameter mainly concentrated between 0.2~10 and 0.2~1 mm diameter. (3) The dyed area had a greater stable outflow rate than the undyed area. The outflow rate of the dyed area in the four sections was 1.97

1.81

1.77 and 1.70 times those of the undyed area

respectively. As the depth of the soil layer increased

the number of macropores decreased

and the radius of the macropores ranged from 0.3 to 1.7 mm; (4) The macroporosity and root biomass were positively correlated with the permeability coefficient

and the macroporosity contributed 94.5% of variation in the permeability coefficients

while root biomass contributed 87.4%.

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