黄河源区高寒草地不同深度土壤理化性质与抗剪强度关系研究

doi:10.13866/j.azr.2021.02.10

Abstract

Abstract:

The relationships between the physical and chemical properties of soil, the shear strength of the root-soil composite system, and the soil depth were investigated in the alpine grassland in Henan Country, Qinghai Province, in the source region of the Yellow River. Direct shear tests of root-soil composite systems and soil physical and chemical content tests were conducted. Five different soil depths (0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm, and 40-50 cm) were selected for sampling. The results showed that the soil moisture content decreased gradually with increasing soil depth. The soil was weakly alkaline, and the soil pH increased. The content of organic matter and nutrient elements in the soil decreased with increasing soil depth. Additionally, the cohesion c value of the soil in the non-degraded grassland gradually decreased with increasing soil depth. For the degraded bare land, the cohesion c value of the soil gradually increased with increasing soil depth. According to the analysis of the gray relational method, the shear strength of the root-soil composite systems was closely related to available P (0.82), root content (0.82), and organic matter (0.76). Additionally, the shear strength was correlated with density of bare soil (0.76) and soil particle size d₆₀ (0.74). The results of this study can be used to inform the effective prevention and control of soil erosion, shallow landslide, and other disasters caused by grassland degradation in extremely cold areas.

Key words: source region of the Yellow River, alpine meadows, root-soil composite systems, physical and chemical properties of soil, shear strength

SHEN Ziyan,LIU Changyi,HU Xiasong,ZHOU Linhu,XU Tong,LI Xilai,LI Guorong. Relationships between the physical and chemical properties of soil and the shear strength of root-soil composite systems at different soil depths in alpine grassland in the source region of the Yellow River[J].Arid Zone Research, 2021, 38(2): 392-401.

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References 30

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序号	测试项目	测试方法
1	pH值	电位法
2	有机质	高温外加热重铬酸钾氧化容量法
3	全氮	凯氏定氮法
4	碱解氮	碱解-扩散法
5	全磷	酸溶-钼锑抗比色法
6	速效磷	碳酸氢钠浸提-钼锑抗比色法
7	全钾	氢氟酸高氯酸消煮法
8	速效钾	乙酸铵浸提-火焰光度法

	取样深度/cm	d₆₀/mm	d₃₀/mm	d₁₀/mm	不均匀系数C_u	曲率系数C_c	砂粒含量/%	级配类型
草地	0~10	2.381	0.400	0.116	20.53	0.58	55.5	级配不良
	10~20	1.294	0.242	0.122	10.61	0.37	67.2	级配不良
	20~30	0.662	0.199	0.112	5.91	0.53	87.1	级配不良
	30~40	0.553	0.253	0.132	4.19	0.88	89.2	级配不良
	40~50	0.355	0.105	0.061	5.82	0.51	90.0	级配不良
裸地	0~10	0.384	0.188	0.101	3.80	0.91	93.7	级配不良
	10~20	0.366	0.175	0.094	3.89	0.89	95.7	级配不良
	20~30	0.396	0.174	0.093	4.26	0.82	95.1	级配不良
	30~40	0.445	0.233	0.127	3.50	0.96	93.8	级配不良
	40~50	0.457	0.204	0.112	4.08	0.81	90.2	级配不良

	取样深度/cm	全氮含量/(g·kg^-1)	碱解氮含量/(mg·kg^-1)	全磷含量/(g·kg^-1)	速效磷含量/(mg·kg^-1)	全钾含量/(g·kg^-1)	速效钾含量/(mg·kg^-1)
草地土壤	0~10	6.03±0.68^a	343±82.46^a	1.99±0.13^a	3.20±0.89^a	24.37±0.52^d	182.67±91.85^a
	10~20	6.03±1.23^a	341.33±93.09^a	1.92±0.17^a	1.87±0.25^b	24.49±0.54^cd	110.33±33.61^ab
	20~30	3.17±1.44^bc	152.33±69.26^bc	1.81±0.37^ab	1.90±0.35^b	25.3±1.95^bcd	79.67±20.43^c
	30~40	2.14±0.47^cd	109.33±46.14^c	1.61±0.06^bc	2.17±0.75^b	26.24±1.1^abc	76.00±14.18^c
	40~50	2.08±0.33^cd	87.33±30.89^c	1.48±0.14^c	2.50±0.26^ab	27.82±0.58^a	74.67±14.36^c
裸地土壤	0~10	3.97±1.05^b	244±67.48^ab	1.47±0.09^c	1.5±0.61^b	25.66±0.73^bcd	190±88.76^a
	10~20	3.78±0.37^b	234±61.94^ab	1.35±0.11^c	1.7±0.33^b	26.56±0.64^ab	114±42.16^ab
	20~30	3.40±0.93^bc	148±58.83^bc	1.34±0.26^c	1.9±0.27^b	26.57±0.91^ab	81±19.41^c
	30~40	2.65±0.29^bcd	100±44.37^c	1.31±0.13^c	2.5±0.49^ab	26.62±1.03^ab	79±16.69^c
	40~50	1.51±0.41^d	65±27.55^c	1.29±0.08^c	3.3±0.76^a	26.62±0.87^ab	75±13.75^c

取样深度/cm	根数/根	干重/g	平均根径/mm
0~10	281.67±224.27^a	8.32±6.17^a	0.43±0.18^a
10~20	165.00±119.79^ab	5.23±4.34^ab	0.34±0.16^ab
20~30	78.33±36.56^ab	1.10±0.30^b	0.26±0.08^ab
30~40	51.67±23.38^b	0.41±0.12^b	0.21±0.06^ab
40~50	40.83±22.45^b	0.22±0.06^b	0.19±0.05^b

类别	草地土体粘聚力c值	裸地土体粘聚力c值
土壤含水率	0.73	0.65
土壤密度	0.57	0.76
土壤颗粒控制粒径d₆₀	0.73	0.73
土壤pH值	0.61	0.74
土壤有机质	0.76	0.67
土壤全氮含量	0.65	0.71
土壤碱解氮含量	0.61	0.56
土壤全磷含量	0.66	0.69
土壤速效磷含量	0.82	0.64
土壤全钾含量	0.63	0.73
土壤速效钾含量	0.74	0.56
土壤中含根量	0.82	-

Relationships between the physical and chemical properties of soil and the shear strength of root-soil composite systems at different soil depths in alpine grassland in the source region of the Yellow River

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