Method for simulating and measuring influence of farmland soil surface cracks on preferential flow infiltration

A soil surface and farmland technology, applied in the field of simulating and measuring the impact of soil surface cracks on farmland preferential infiltration, can solve the problems of increased infiltration, deterioration of groundwater quality, etc., and achieves the effect of low cost and simple operation.

Active Publication Date: 2018-04-24
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soil cracks can provide preferential flow channels and increase infiltration, which can not only effectively improve soil water holding capacity during heavy rain, but also effectively inhibit the formation of surface runoff. The saturated area is introduced into the groundwater, which will cause the deterioration of the groundwater quality, so it is very necessary to measure and analyze the effect of soil cracks on the preferential inflow and infiltration
There are usually obvious soil cracks on the soil surface of farmland after irrigation, but there is no method for measuring and analyzing the effect of cracks on the farmland soil surface on the preferential infiltration in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Quantitative analysis of the impact of farmland soil surface cracks on preferential infiltration in the corn field of the Caijiachuan small watershed in the field national positioning observation station in Jixian County, Shanxi by using a method of simulating and measuring the effect of farmland soil surface cracks on preferential infiltration provided by the present invention , which may specifically include the following steps:

[0044] Step a1, select three adjacent flat sample plots in the corn field area, place three cylindrical plexiglass sampling tubes with an inner diameter of 40 cm and a height of 80 cm vertically on a different sample plot respectively, and use a soil scraper along the The outer wall of the sampling tube is slowly cut out a soil column whose diameter is consistent with the inner diameter of the sampling tube, and then the sampling tube is slowly pressed into the soil, and the outer wall of the sampling tube is edged with a soil scraper while p...

Embodiment 2

[0051] Quantitative analysis of the impact of farmland soil surface cracks on preferential infiltration in the corn field of the Caijiachuan small watershed in the field national positioning observation station in Jixian County, Shanxi by using a method of simulating and measuring the effect of farmland soil surface cracks on preferential infiltration provided by the present invention , which may specifically include the following steps:

[0052] Step a2, select three adjacent flat sample plots in the corn field area, place three cylindrical plexiglass sampling tubes with an inner diameter of 20 cm and a height of 60 cm vertically on a different sample plot, and use a soil scraper along the The outer wall of the sampling tube is slowly cut out a soil column whose diameter is consistent with the inner diameter of the sampling tube, and then the sampling tube is slowly pressed into the soil, and the outer wall of the sampling tube is edged with a soil scraper while pressing. Cut...

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Abstract

The invention discloses a method for simulating and measuring influence of farmland soil surface cracks on preferential flow infiltration. The method comprises the following steps: sampling undisturbed farmland soil with a sampling tube, and injecting dissolved paraffin into a gap between the tube wall and a soil column in the tube; laying a 80-mesh steel wire mesh on the surface of each soil column and laying a gravel layer; irrigating each soil column to form cracks on the surface of the soil column; sealing the surface cracks of one soil column by the dissolved paraffin; injecting water totwo soil columns respectively, dynamically monitoring the outflow volume of each soil column by an electronic balance, and recording the accumulated outflow volume and accumulated outflow time respectively; calculating the infiltration volume of preferential flow produced by the soil surface cracks, the percentage of the infiltration volume of preferential flow accounting for the total infiltration volume and the average outflow rate of the two soil columns. The farmland soil surface cracks can be well simulated indoors, conditions of infiltration volume of preferential flow produced by the cracks can be measured and analyzed quantitatively, and the method is simple to operate and low in cost.

Description

technical field [0001] The invention relates to the technical field of farmland hydrological observation in soil and water conservation, in particular to a method for simulating and measuring the effect of cracks on the surface of farmland soil on preferential inflow and infiltration. Background technique [0002] Soil shrinks under dry conditions and creates soil cracks, which can lead to changes in soil structure. The size and tortuosity of soil cracks largely determine the transport rate of water and its solutes. Soil cracks can provide preferential flow channels and increase infiltration, which can not only effectively improve soil water holding capacity during heavy rain, but also effectively inhibit the formation of surface runoff. The saturated area is introduced into the groundwater, which will cause the deterioration of the groundwater quality, so it is very necessary to measure and analyze the effect of soil cracks on the preferential inflow and infiltration. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 朱清科梅雪梅马岚李柏张恰咛苟清平申明爽罗舒元
Owner BEIJING FORESTRY UNIVERSITY
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