Experimental Study of Different Layers Infiltration of Soil Bunds on Purple-soil Sloping Farmlands

doi:10.13870/j.cnki.stbcxb.2017.04.012

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Experimental Study of Different Layers Infiltration of Soil Bunds on Purple-soil Sloping Farmlands

更新时间：2025-03-12

- Experimental Study of Different Layers Infiltration of Soil Bunds on Purple-soil Sloping Farmlands
- Vol. 31, Issue 4, Pages: 69-74(2017)
- 作者机构：
  
  1. 重庆师范大学地理与旅游学院,重庆,401331
  2. 三峡库区地表过程与环境遥感重庆市重点实验室,重庆,401331
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2017.04.012
  CLC： S157.3+2
- Published：2017
- 稿件说明：
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Experimental Study of Different Layers Infiltration of Soil Bunds on Purple-soil Sloping Farmlands[J]. 2017, 31(4): 69-74.
DOI：

Experimental Study of Different Layers Infiltration of Soil Bunds on Purple-soil Sloping Farmlands[J]. 2017, 31(4): 69-74. DOI： 10.13870/j.cnki.stbcxb.2017.04.012.

摘要

以相邻田面为对照，利用双环入渗法对三峡库区紫色土坡耕地土质埂坎分层（地埂、坎腰和坎趾）的入渗特征进行研究。结果表明：（1）土质埂坎分层入渗与对照田面入渗均呈先陡降后趋于稳定的趋势，但达到稳定入渗的时间存在差异。地埂达到稳定入渗的时间最长（110 min），分别比坎腰、坎趾和田面达稳定入渗的时间长9%，82%，18%。从入渗性能看，土质埂坎各层均表现出初始入渗率＞平均入渗率＞稳定入渗率。平均入渗率与120 min累积入渗量表现为地埂＞坎腰＞田面＞坎趾，初始入渗率为坎腰＞地埂＞田面＞坎趾，稳定入渗率为田面＞坎腰＞地埂＞坎趾。（2）采用4种模型进行拟合，其中通用经验模型是描述坡耕地土质埂坎入渗的较好模型，其后依次是Kostiakov模型、Horton模型和Philip模型。（3）土质埂坎入渗性能与土壤物理性质具有较好的相关性，初始入渗率与初始含水率、容重呈显著负相关（P＜0.05），平均入渗率、120 min累积入渗量与粉粒体积分数、初始含水率呈显著负相关（P＜0.05），与砂粒体积分数和总孔隙度呈显著正相关（P＜0.05）。研究结果可为紫色土区坡耕地土壤侵蚀调控的埂坎措施优化提供依据。

Abstract

An adjacent field was taken as a reference and soil infiltration rates of layered soil bunds (the upper

the central and the lower) were determined using double rings on the purple-soil sloping farmland. The results showed that: (1) The infiltration processes of all layered soil bunds and the field dropped steeply then decreased slowly till stable. However

there were differences on the duration to the stable infiltration. It cost a relatively longer time (110 minutes) for the upper bund to the stable state. The time for upper one was 9%

82%

and 18% longer than that of central bund

the lower bund and the field. In perspective of infiltration performance

the soil permeability was sequenced as the initial infiltration rate

the mean infiltration rate

and then the steady infiltration rate. In view of layered soil bunds

the mean infiltration rate and the 120 minutes cumulative infiltration was sorted as the upper bund

the central bund

the field

and the lower bund. The initial infiltration rate was sequenced as the central bund

the upper bund

the field

and the lower bund

while the steady infiltration rate was sorted as the field

the central bund

the upper bund

and the lower bund. (2) Four models had been used to simulate the soil bund infiltrations. Among them

the general experience model was considered as the optimum one

and it was followed by the Kostiakov model

the Horton model and the Philip model. (3) The permeability of soil bunds had close relation with soil physical properties. The initial infiltration rate was significantly negative related to the initial water content and soil bulk density (P＜0.05). The mean infiltration rate and the 120 minutes cumulative infiltration was significantly negative correlated with the silty particles volume and the initial water content (P＜0.05)

and significantly positive correlated with the sandy particles volume and the total porosity (P＜0.05). The results of this study can provide a foundation for bunds construction as to control soil erosion on purple-soil farmlands.

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