Loess Slope Crust: Effects on the Stability and Erodibility of Soil Water-stable Aggregates

doi:10.11924/j.issn.1000-6850.casb19030062

Abstract

Abstract:

The paper aims to explore the crust types and the aggregates composition differences in micro-topographic soil attacked by raindrops. We studied the distribution characteristics, stability and soil erodibility of crust soil water-stable aggregates at different locations on slopes by simulated rainfall. The results showed that: (1) the water-stable aggregates of undisturbed soil, structural crust, sedimentary crust, transitional zone crust>0.25 mm were 37.28%, 43.58%, 36.69% and 40.34%, respectively; (2) taking the rainfall for 5 min as an example, the PAD of water-stable aggregates of undisturbed soil, structural crust, sedimentary crust and transitional zone crust were 51.49%, 46.00%, 62.76%, 51.02%, respectively; (3) the MWD of water-stable aggregates of undisturbed soil, structural crust, sedimentary crust and transitional zone crust were 0.15, 0.20, 0.14, 0.17 mm, respectively; (4) the erodibility K values of undisturbed soil, structural crust, sedimentary crust and transitional zone crust were 0.223, 0.200, 0.229, 0.205, respectively. The crust differences under micro-topography make the distribution of water-stable aggregates different, so the stability and erodibility of soil water-stable aggregates are different.

Key words: soil aggregates, soil erodibility, Yoder wet screening, crust types, simulated rainfall, micro-topography

CLC Number:

S152.7

Chen Lin, Wang Jian, Song Pengshuai, Zhao Yu, Ma Yuhong. Loess Slope Crust: Effects on the Stability and Erodibility of Soil Water-stable Aggregates[J]. Chinese Agricultural Science Bulletin, 2020, 36(18): 87-92.

Figures/Tables 6

References 34

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降雨历时/min	结皮位置
降雨历时/min	沉积结皮	过渡带结皮	结构结皮
0	51.49	51.49	51.49
5	62.76	51.02	46.00
10	61.35	48.32	41.06
15	60.15	45.54	37.68
20	62.39	37.91	32.20
30	63.68	35.64	27.97

降雨历时/min	结皮位置
降雨历时/min	沉积结皮	过渡带结皮	结构结皮
0	51.49	51.49	51.49
5	62.76	51.02	46.00
10	61.35	48.32	41.06
15	60.15	45.54	37.68
20	62.39	37.91	32.20
30	63.68	35.64	27.97

不同位置结皮	平均值	最大值	最小值
结构结皮	0.200±0.0469a	0.223	0.184
过渡带结皮	0.205±0.0138a	0.223	0.186
沉积结皮	0.229±0.0138a	0.234	0.223
CK	0.223±0.0205a	0.233	0.202

不同位置结皮	平均值	最大值	最小值
结构结皮	0.200±0.0469a	0.223	0.184
过渡带结皮	0.205±0.0138a	0.223	0.186
沉积结皮	0.229±0.0138a	0.234	0.223
CK	0.223±0.0205a	0.233	0.202