[1]PU Junze,Lv Xizhi,ZHANG Qiufen,et al.Characteristics and Influencing Factors of Runoff and Sediment Yield of Typical Grassland in Loess Hilly and Gully Region[J].Research of Soil and Water Conservation,2023,30(02):1-6.[doi:10.13869/j.cnki.rswc.2023.02.015]
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Characteristics and Influencing Factors of Runoff and Sediment Yield of Typical Grassland in Loess Hilly and Gully Region
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 02
Page number:
1-6
Column:
Public date:
2023-03-10
- Title:
- Characteristics and Influencing Factors of Runoff and Sediment Yield of Typical Grassland in Loess Hilly and Gully Region
- Keywords:
- characteristics of sediment and runoff yield; rainfall characteristics; grass; hilly and gully region
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2023.02.015
- Abstract:
- Returning farmland to forest and grassland is one of the important measures to control soil erosion in the Loess Plateau. In order to investigate the effects of planting different kinds of grass on the characteristics of sediment yield and discharge on the slope under natural rainfall conditions, the field observation data of six different grass covers(Coronilla varia L., Onobrychis viciaefolia Scop L., Astragalus adsurgens Pall L., Medicago sativa L., Trifolium pratense L. and Astragalus cicer L.)in Luoyugou soil and water conservation monitoring station were used. In order to provide theoretical support for soil and water loss control in hilly-gully region of loess plateau, the pattern of sediment yield and runoff in each grass-covered runoff district under different rainfall conditions was analyzed. The results showed as follows.(1)In different rainfall periods, the runoff and sediment yields on the slope covered by Coronilla varia L. were larger, while those on the slope covered by Astragalus adsurgens Pall L. and Astragalus cicer L. were smaller.(2)Sediment yield was significantly correlated with rainfall and maximum rainfall intensity in different grassy areas except Astragalus adsurgens Pall L. and Astragalus cicer L.(3)According to rainfall, rainfall duration and maximum rainfall intensity, the erosive rainfall can be divided into three types: rain type Ⅰ(large rainfall, long rainfall duration and the most heavy rain), rain type Ⅱ(rainfall, rainfall duration and the most heavy rain intensity are all in the middle), rain type Ⅲ(small rainfall, short rainfall duration and the most heavy rain intensity). Under various rain patterns, the sediment and runoff yields of the six grasses differed. the runoff and sediment output on the slopes covered with Astragalus adsurgens Pall L. and Astragalus cicer L. reduced, while the runoff and sediment yields on the slopes covered with Coronilla varia L. were higher under different rain patterns. In conclusion, the patterns of sediment productions and losses on the slope under different grass covers were not the same, the degrees of responses to different rainfall characteristics were also different, the anti-erosion ability of the Coronilla varia L. covered area was poor. The anti-erosion ability was better in the areas covered by Astragalus adsurgens Pall L. and Astragalus cicer L.
- References:
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Last Update:
2023-03-10