Erodibility and Main Influencing Factors of Soil Rill in Gully Development Area of Dry-hot Valley

HE Zhouyao; SU Zhengan; WANG Yong; ZHOU Tao; WANG Junjie; WANG Xiaoyi

doi:10.13870/j.cnki.stbcxb.2020.03.002

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Erodibility and Main Influencing Factors of Soil Rill in Gully Development Area of Dry-hot Valley

更新时间：2025-03-12

- Erodibility and Main Influencing Factors of Soil Rill in Gully Development Area of Dry-hot Valley
- Vol. 34, Issue 3, Pages: 8-13(2020)
- 作者机构：
  
  1. 中国科学院水利部成都山地灾害与环境研究所, 中国科学院山地灾害与地表过程重点实验室,成都,610041
  2. 四川农业大学林学院,成都,611130
  3. 四川农业大学水利水电学院,四川,雅安,625014
  4. 中国科学院大学,北京,100049
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.03.002
  CLC： S157.1
- Published：2020
- 稿件说明：
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HE Zhouyao, SU Zhengan, WANG Yong, et al. Erodibility and Main Influencing Factors of Soil Rill in Gully Development Area of Dry-hot Valley[J]. 2020, 34(3): 8-13.
DOI：

HE Zhouyao, SU Zhengan, WANG Yong, et al. Erodibility and Main Influencing Factors of Soil Rill in Gully Development Area of Dry-hot Valley[J]. 2020, 34(3): 8-13. DOI： 10.13870/j.cnki.stbcxb.2020.03.002.

摘要

为探明我国干热河谷区不同活跃程度冲沟不同空间部位土壤细沟可蚀性（Kr值）在不同近地表水文条件下的差异，在云南省元谋县选择不同活跃程度的冲沟，采集其不同空间部位（集水区、沟壁、沟床）的土壤样品，利用"V"形细沟模拟冲刷装置进行放水冲刷试验，流量设置为150，300，450，600，750，900 mL/min，分别进行排水、饱和、渗流3种水文状态的模拟试验。结果表明：（1）干热河谷冲沟发育区土壤砂粒含量明显高于粉粒和黏粒，占50%以上，土壤有机质（SOM）和全氮（TN）含量较低；（2）不同活跃程度冲沟土壤机械组成、有机质含量之间均存在显著差异，且随着冲沟稳定性增加，土壤砂粒含量呈逐渐降低趋势，土壤粉粒、黏粒、SOM、TN含量则呈不同程度的增加趋势；（3）在不同近地表水文状态下，土壤Kr值（s/m）均随冲沟稳定性的增加而呈递减趋势，表现为Kr（活跃型） > Kr（半稳定型） > Kr（稳定型），而不同活跃度冲沟土壤临界剪切力τc值之间具有一定差异性，但无明显规律；（4）冲沟不同部位土壤Kr值之间也具有显著的空间异质性，表现Kr（集水区） < Kr（沟壁） < Kr（沟床）；（5）随着近地表水文条件由排水状态转变为饱和、渗流状态，冲沟发育区不同空间部位的土壤Kr值均显著增加。综上可见，冲沟活跃程度（植被恢复程度）、近地表水文条件、土壤机械组成和有机质含量等均会对干热河谷冲沟发育区土壤可蚀性产生显著影响。

Abstract

In order to find out the difference of soil rill erodibility (Kr value) under different near-surface hydrological conditions in different spatial parts of gullies with different active degrees in dry-hot valleys of China

different active gullies were selected in Yuanmou County of Yunnan Province

and soil samples of different spatial parts (upstream catchment area

gully wall and gully bed) were collected

and the "V" type rill simulation scour device was used to carry out drainage scour experiment under three hydrological conditions (drainage

saturation and seepage)

the flow rates were set as 150

300

450

600

750 and 900 mL/min. The results showed that: (1) In gully development area of dry-hot valley

the content of soil sand was significantly higher than that of silt and clay

accounting for more than 50%

and the content of soil organic matter (SOM) and total nitrogen (TN) was relatively low. (2) There were significant differences in mechanical composition and organic matter content among gullies with different active degrees

as the gully stability increased

the soil sand content gradually decreased

while the content of silt

clay

SOM and TN increased. (3) Under different near-surface hydrological conditions

as the gully stability increased

the soil rill erodibility (Kr value

s/m) of gully decreased

which followed the order of Kr (active type) > Kr (semi-stable type) > Kr (stable type). In addition

an obvious difference in soil critical shear force (τc

Pa) appeared in gullies with different activity degrees

while no obvious change tendency could be found. (4) Significant differences in Kr values could be found in the different parts of gully

which followed the order of Kr (upstream catchment area) < Kr (gully wall) < Kr (gully bed). (5) With the change of near-surface hydrological conditions from drainage state to saturation and seepage state

values of Kr in the different spatial parts of gully increased significantly. In conclusion

gully activity (vegetation restoration condition)

near-surface hydrological condition

soil particle size fraction and content of SOM could obviously affected soil erodibility in the gully developed areas of dry-hot valley.

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