[1]LI Zhiyong,ZHANG Mengjie,CHEN Mingyu,et al.Effects of Alfalfa(Medicago sativa L.)on Runoff and Sediment Yield and Soil Moisture on Slope[J].Research of Soil and Water Conservation,2021,28(05):54-60.
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Effects of Alfalfa(Medicago sativa L.)on Runoff and Sediment Yield and Soil Moisture on Slope
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 05
Page number:
54-60
Column:
Public date:
2021-08-20
- Title:
- Effects of Alfalfa(Medicago sativa L.)on Runoff and Sediment Yield and Soil Moisture on Slope
- CLC:
- S157.1
- DOI:
- -
- Abstract:
- Alfalfa plays an important role in the ecological restoration of Loess Plateau. In this work,the runoff rate,sediment yield rate,and soil moisture conditions were measured under indoor simulated artificial rainfall with 80 mm/ h of rainfall intensity 60-minute rainfall duration different slopes(5°,15°,and 10°)and three kinds of alfalfa coverage(bare land,low coverage,and high coverage)to further understand the effects of alfalfa on these parameters. Results show that:(1)alfalfa can significantly reduce the runoff on slope(p<0.01); compared with that in bare slope(1.34 mm/min),the surface runoff on slope reduces by 43% and 78% under low and high alfalfa coverage,respectively; however,the difference was not significant(p>0.05);(2)alfalfa coverage can significantly reduce sediment yield on the slope surface(p<0.01); the average sediment yield rate on bare slope surface was 23.50 g/(m2·min)at the slope of 15°,which is 8.6 and 13.7 times of that on slopes with low and high alfalfa coverage,respectively;(3)the effects of alfalfa on reducing erosion and sediment yield are stronger than that on reducing runoff;(4)after 24 h of rainfall,the average increment of soil water storage in the 0—90 cm depth soil layer is 15.9～21.3 mm and 28.6～38.7 mm in slopes with low and high alfalfa coverage,respectively,and the increment of soil water storage in the bare slope is 6.4 mm; and with the increase of coverage,the infiltration depth of soil water also increases gradually. Therefore,alfalfa mulch can significantly reduce the runoff and the sediment yield and increase the soil water infiltration.
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Last Update:
2021-08-20