RELATIONSHIP BETWEEN HERBACEOUS ROOT SYSTEM AND VERTICAL SOIL SEDIMENT YIELD IN LOESS AREA

doi:10.17521/cjpe.2006.0040

Abstract

Abstract:

Current knowledge about root morphology and its impacts on soil erosion is limited and, therefore, detailed analyses of root system in controlling soil erosion are needed. In order to determine the effects of root system on soil erosion quantitatively, root investigation and stratified runoff scouring were conducted in field. The distribution of vertical root biomass on three sites decreased with the increase of soil depth in a similar manner. Most roots were concentrated in surface soil, and decreased to less than 0.2 kg·m^-3 in soil below the depth of 40 cm. There was no significant difference in root biomass on the same soil depth from different points. Results from stratified runoff scouring on different soil depths in the field indicated that, on the surface soil layer, the existence of root could effectively improve soil resistance to runoff erosion, and its effect on sediment yield was dominant. While in deeper soil, sediment yield increased with the decrease of root distribution, and was more related to slope gradient, runoff discharge and soil properties. In addition, with the progress of runoff scouring, the form of soil erosion changed from sheet erosion to rill erosion. Investigation of the root distribution patterns revealed that the vertical sediment yield was closely related to root distribution characteristics. Further analysis of the root distribution pattern and the vertical sediment yield allowed establishment of a quantitative relationship between root biomass and vertical sediment yield.

Key words: Root, Soil depth, Soil erosion and sediment yield, Loess Plateau

LI Peng, LI Zhan_Bin, LU Ke_Xin. RELATIONSHIP BETWEEN HERBACEOUS ROOT SYSTEM AND VERTICAL SOIL SEDIMENT YIELD IN LOESS AREA[J]. Chin J Plant Ecol, 2006, 30(2): 302-306.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2006.0040

https://www.plant-ecology.com/EN/Y2006/V30/I2/302

Figures/Tables 6

References 13

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小区编号 Plot No.	流量 Runoff discharge (L·min^-1)	坡度 Slope (°)	植被覆盖度 Vegetative cover	土壤容重 Bulk density (g·cm^-3)	坡向 Direction	坡位 Position	地点 Location
1	6.5	20	0.86	1.28	南South	坡上Upper	黄白洼Hangbaiwa
2	8.5	20	0.81	1.25	南South	坡上Upper	黄白洼Hangbaiwa
3	10.5	20	0.82	1.23	南South	坡上Upper	黄白洼Hangbaiwa
4	12.5	20	0.81	1.24	南South	坡上Upper	黄白洼Hangbaiwa
5	14.5	20	0.85	1.27	南South	坡上Upper	黄白洼Hangbaiwa
6	10.5	25	0.82	1.27	南South	坡中Middle	桐树洼Tongshuwa
7	12.5	25	0.8	1.21	南South	坡中Middle	桐树洼Tongshuwa
8	14.5	25	0.81	1.29	南South	坡中Middle	桐树洼Tongshuwa
9	10.5	32	0.82	1.25	南South	坡中Middle	桐树洼Tongshuwa
10	12.5	32	0.8	1.31	南South	坡中Middle	桐树洼Tongshuwa
11	10.5	8	0.82	1.28	南South	坡下Lower	岳家山Yuejiashan
12	12.5	8	0.82	1.24	南South	坡下Lower	岳家山Yuejiashan

小区编号 Plot No.	流量 Runoff discharge (L·min^-1)	坡度 Slope (°)	植被覆盖度 Vegetative cover	土壤容重 Bulk density (g·cm^-3)	坡向 Direction	坡位 Position	地点 Location
1	6.5	20	0.86	1.28	南South	坡上Upper	黄白洼Hangbaiwa
2	8.5	20	0.81	1.25	南South	坡上Upper	黄白洼Hangbaiwa
3	10.5	20	0.82	1.23	南South	坡上Upper	黄白洼Hangbaiwa
4	12.5	20	0.81	1.24	南South	坡上Upper	黄白洼Hangbaiwa
5	14.5	20	0.85	1.27	南South	坡上Upper	黄白洼Hangbaiwa
6	10.5	25	0.82	1.27	南South	坡中Middle	桐树洼Tongshuwa
7	12.5	25	0.8	1.21	南South	坡中Middle	桐树洼Tongshuwa
8	14.5	25	0.81	1.29	南South	坡中Middle	桐树洼Tongshuwa
9	10.5	32	0.82	1.25	南South	坡中Middle	桐树洼Tongshuwa
10	12.5	32	0.8	1.31	南South	坡中Middle	桐树洼Tongshuwa
11	10.5	8	0.82	1.28	南South	坡下Lower	岳家山Yuejiashan
12	12.5	8	0.82	1.24	南South	坡下Lower	岳家山Yuejiashan

地点 Site	流量 Runoff discharge (L·min^-1)	深度 Depth (cm)
		0~5	5~10	10~15	15~20	20~25	25~30	30~40	40~50	50~60
		产沙量 Sediment yield (g·min^-1)
	岳家山(8°) Yuejiashan	12.5	33.14	25.06	31.68	-	37.73	37.84	46.00	59.16	-
		10.5	11.27	20.81	23.87	-	34.73	34.05	38.90	50.84	-
	黄白洼(20°) Huangbaiwa	6.5	19.48	18.23	24.81	25.27	25.73	28.14	33.48	62.90	-
		8.5	14.24	20.67	12.46	18.13	23.81	16.80	65.71	111.53	-
		10.5	16.47	25.17	21.00	36.86	23.24	65.06	84.91	129.91	156.19
		12.5	22.47	91.25	31.94	69.32	53.99	80.94	161.42	255.79	-
	14.5	29.20	24.09	25.28	26.46	40.08	114.61	177.14	271.77	-
桐树洼25° Tongshuwa	10.5	15.91	19.57	22.50	39.67	111.83	118.42	134.43	143.03	-
	12.5	22.30	29.67	39.86	71.33	98.93	130.44	135.39	149.51	-
	14.5	28.03	25.18	45.39	80.33	107.62	133.19	151.42	179.71	-
桐树洼32° Tongshuwa	10.5	14.99	20.67	31.67	118.20	143.64	168.41	250.03	285.75	-
	12.5	56.63	61.42	93.60	101.10	122.21	160.71	240.05	285.55	-

地点 Site	流量 Runoff discharge (L·min^-1)	深度 Depth (cm)
		0~5	5~10	10~15	15~20	20~25	25~30	30~40	40~50	50~60
		产沙量 Sediment yield (g·min^-1)
	岳家山(8°) Yuejiashan	12.5	33.14	25.06	31.68	-	37.73	37.84	46.00	59.16	-
		10.5	11.27	20.81	23.87	-	34.73	34.05	38.90	50.84	-
	黄白洼(20°) Huangbaiwa	6.5	19.48	18.23	24.81	25.27	25.73	28.14	33.48	62.90	-
		8.5	14.24	20.67	12.46	18.13	23.81	16.80	65.71	111.53	-
		10.5	16.47	25.17	21.00	36.86	23.24	65.06	84.91	129.91	156.19
		12.5	22.47	91.25	31.94	69.32	53.99	80.94	161.42	255.79	-
	14.5	29.20	24.09	25.28	26.46	40.08	114.61	177.14	271.77	-
桐树洼25° Tongshuwa	10.5	15.91	19.57	22.50	39.67	111.83	118.42	134.43	143.03	-
	12.5	22.30	29.67	39.86	71.33	98.93	130.44	135.39	149.51	-
	14.5	28.03	25.18	45.39	80.33	107.62	133.19	151.42	179.71	-
桐树洼32° Tongshuwa	10.5	14.99	20.67	31.67	118.20	143.64	168.41	250.03	285.75	-
	12.5	56.63	61.42	93.60	101.10	122.21	160.71	240.05	285.55	-

流量 Runoff discharge (L·min^-1)	6.5	8.5	10.5	12.5	14.5
a	547.812 6	411.940 1	338.430 5	226.841 8	200.590 7
b	125.872 6	92.813 5	78.695 4	53.084 8	49.879 0
标准差 SD	0.000 5	0.000 5	0.000 6	0.000 8	0.000 9
相关系数 Correlative coefficient (R)	0.981 7	0.989 3	0.995 6	0.993 3	0.995 8