Soil and Water Conservation Effect and Mechanism Analysis of Different Plants in Ephemeral Gully of Farmland

WANG Xinyu; ZHANG Yan; GUAN Yinghui; SUN Yiqiu; SU Yu; WANG Zhirong; WU Hailong

doi:10.13870/j.cnki.stbcxb.2023.01.004

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Soil and Water Conservation Effect and Mechanism Analysis of Different Plants in Ephemeral Gully of Farmland

更新时间：2025-03-12

- Soil and Water Conservation Effect and Mechanism Analysis of Different Plants in Ephemeral Gully of Farmland
- Vol. 37, Issue 1, Pages: 23-30(2023)
- 作者机构：
  
  1. 天津理工大学环境科学与安全工程学院,天津,300384
  2. 北京林业大学水土保持学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2023.01.004
  CLC： S157.1
- Published：2023
- 稿件说明：
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WANG Xinyu, ZHANG Yan, GUAN Yinghui, et al. Soil and Water Conservation Effect and Mechanism Analysis of Different Plants in Ephemeral Gully of Farmland[J]. 2023, 37(1): 23-30.
DOI：

WANG Xinyu, ZHANG Yan, GUAN Yinghui, et al. Soil and Water Conservation Effect and Mechanism Analysis of Different Plants in Ephemeral Gully of Farmland[J]. 2023, 37(1): 23-30. DOI： 10.13870/j.cnki.stbcxb.2023.01.004.

摘要

为探究不同植物在东北黑土地区农田浅沟中的水土保持效果

建立裸坡(LP)和种植有紫花苜蓿(V1)和马蔺草(V2) 2种植物的坡面浅沟模型

通过在浅沟内模拟上方汇水

进行不同植物覆盖下的浅沟坡面水力侵蚀试验

分析产流产沙特征及水动力学参数时空变化特征。结果表明:(1)相同流量下产流时间为裸坡f)(2.3)高于马蔺草(0.8)

同时紫花苜蓿的平均流速(u)略低于马蔺草

弗劳德数(Fr)表现为紫花苜蓿Re)表现为紫花苜蓿

Abstract

To investigate the effects of different plants on soil and water conservation in ephemeral gullies of agricultural fields in the black soil region of Northeast China

ephemeral gullies were modelled on bare slopes (LP) and slopes planted with both alfalfa (V1) and Iris ensata Thunb (V2). By simulating upper catchment

hydraulic erosion experiments were carried out on the slope surface of ephemeral gullies covered by different plants

and the characteristics of runoff and sediment yield as well as the spatial and temporal variation of hydrodynamic parameters were analyzed. The results showed that: (1) Under the same flow rate

the runoff generation time followed the order of LP < alfalfa < I. ensata Thunb

with significantly prolonged flow production and greater infiltration

sediment-reduction benefits of alfalfa (61%) was significantly better than that of I. ensata Thunb (29%)

but the runoff reduction benefits of alfalfa (33%) was slightly weaker than that of I. ensata Thunb (38%). (2) Under the same flow rate

hydraulic friction coefficient (f) of alfalfa (2.3) was higher than that of I. ensata Thunb (0.8)

while the average flow rate (u) of alfalfa was slightly lower than that of I. ensata Thunb

the Froude number (Fr) and the mean Reynolds number (Re) followed the order of alfalfa < I. ensata Thunb

and the overall flow was turbulent. (3) Analysis of the fitted functions showed that Reynolds number was positively correlated with flow rate and friction coefficient under the three sets of experiments

but the functional relationship was slightly different. Froude number was negatively correlated with friction coefficient

all in line with the law of logarithmic function change. The results showed that the reduction of runoff and sediment yield was due to the increase of friction and infiltration rate of the vegetation cover

and alfalfa was more effective in reducing runoff and sediment than I. ensata Thunb. With the increasing flow rate

the runoff and sediment reduction benefits of I. ensata Thunb decayed more rapidly than those of alfalfa. The critical flow rate for protection of I. ensata Thunb was 30~40 L/min

and alfalfa could meet the soil and water conservation needs at higher catchment flow.

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