土壤分层关键因子确定——以新乡实验农地为例

doi:10.11821/dlyj201411012

Abstract

Abstract:

Multi-layered soil is a ubiquitous soil structure in the soil profile. The key factors to divide multi-layered soil were discovered, which is of great significance to simply and accurately determine layered soil stratification. In this paper, a measured profile was dug in Xinxiang city, Henan province, whose depth was 160 cm. Meanwhile, lots of field observation and laboratory analyses were done on the soil samples collected in the profile. Then we obtained a number of soil hydraulic and physical parameters, including soil texture, soil bulk density, saturated soil moisture, saturated hydraulic conductivity, residual moisture and non-capillary porosity. By using correlation analysis, systematic cluster analysis and principal component analysis of the factors obtained in the profile, it is indicated that the soil profile (0-160 cm) can be divided into four layers: 0-50 cm, 50-80 cm, 80-120 cm and 120-160 cm. The importance order of the factors to divide the layered soil is: residual moisture > saturated water content > saturated hydraulic conductivity > soil bulk density> non-capillary porosity. In the discussion, the method of soil layer classification is robust. Therefore, the results obtained in this paper would provide scientific guideline for the numerical model of multi-layered soil moisture equation.

Key words: layered soil, soil hydraulic parameters, principal component analysis, systematic cluster analysis

Yalu SONG, Suxia LIU, Ying MA, Chao HU, Xingguo MO. Determining key factors for soil stratification: A case study in the farmland of Xinxiang[J].GEOGRAPHICAL RESEARCH, 2014, 33(11): 2125-2134.

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References 28

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埋深(cm)	拟合参数			相关系数r
埋深(cm)	α	n	θ	相关系数r
20	0.00407	1.157	0.013	0.982
30	0.01084	1.160	0.009	0.980
50	0.00052	1.244	0.011	0.996
80	0.00576	1.205	0.019	0.996
100	0.00288	1.209	0.034	0.989
120	0.00119	1.198	0.043	0.983
140	0.00098	1.207	0.023	0.978
160	0.00354	1.260	0.016	0.998

埋深(cm)	黏粒(<0.002 mm)	粉粒(0.002~0.02 mm)	砂粒(>0.02 mm)	质地
埋深(cm)	%			质地
0~20	6.638	32.051	61.311	砂质壤土
20~30	6.884	47.031	46.085	砂质壤土
30~50	7.550	45.425	47.025	壤土
50~80	6.464	31.794	61.741	砂质壤土
80~100	55.449	44.038	0.513	粉黏土
100~120	61.215	38.474	0.311	黏土
120~140	46.318	50.920	2.762	粉黏土
140~160	7.597	58.856	33.546	粉砂壤土

埋深(cm)	ρ_b(g/cm³)	θ_s(cm³/cm³)	K_s(cm/s)	θ_r(cm³/cm³)	P_n
20	1.510	0.423	0.000564	0.013	0.054
30	1.569	0.403	0.000502	0.009	0.124
50	1.719	0.369	0.000092	0.011	0.012
80	1.608	0.387	0.000719	0.004	0.101
100	1.387	0.487	0.000075	0.034	0.064
120	1.331	0.496	0.000020	0.043	0.026
140	1.442	0.468	0.000065	0.023	0.023
160	1.339	0.475	0.000195	0.016	0.088

	ρ_b	θ_s	K_s	θ_r	P_n
ρ_b	1.000
θ_s	-0.972	1.000
K_s	0.445	-0.599	1.000
θ_r	-0.742	0.848	-0.741	1.000
P_n	0.034	-0.201	0.689	-0.483	1.000

成分	特征值	贡献率(%)	累计贡献率(%)
1	3.393	67.853	67.853
2	1.252	25.045	92.898
3	0.207	4.135	97.033
4	0.140	2.809	99.843
5	0.008	0.157	100.000

Determining key factors for soil stratification: A case study in the farmland of Xinxiang

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