Spatial Variability of Soil Nutrients in Cultivated Land in Typical County of Hetao Plain

doi:10.11924/j.issn.1000-6850.casb20191000781

Abstract

Abstract:

The paper aims to study the soil nutrient status in Hetao Plain and explore the spatial variability and distribution characteristics of soil nutrients at county scale. By taking the arable land in Hangjinhouqi County as the object, the content of soil organic matter, total soil nitrogen, available phosphorus and rapid available potassium in the cultivated soil were studied, the spatial variability and distribution characteristics of soil nutrients were analyzed by field investigation and geostatistics. The results showed that the average content of soil organic matter, total nitrogen, available phosphorus and available potassium in topsoil in the arable layer was 13.90 g/kg, 0.93 g/kg, 16.25 mg/kg and 170.79 mg/kg, respectively. The soil organic matter and total soil nitrogen in the arable layer were in a deficient state, the content of available phosphorus was moderate, and the rapid available potassium was abundant. From the perspective of spatial variation and correlation, the variation degree of soil nutrients was moderate, the organic matter and rapid available potassium were moderately correlated, and the total nitrogen and available phosphorus were weakly correlated. From the perspective of spatial distribution pattern, the soil organic matter came to a trend of high level in the northwest, low level in the southeast and northeast, and the distribution of soil total nitrogen was similar to that of soil organic matter. The overall distribution of available potassium in soil was relatively balanced; the spatial difference of available phosphorus was obvious, showing a pattern of east high and west low. Concerning the soil nutrient content and distribution in the region, the process of nutrient management should be as following: control the nitrogen, stabilize the phosphorus, stabilize the potassium, combine the planning of the whole district with the key response, and adhere to the organic fertilizer, organic and inorganic combined fertilization strategy. The investigation and statistical analysis of soil nutrient status at the county scale clarified the spatial distribution characteristics of regional soil nutrients and their relationship with land using patterns, providing a scientific basis for soil nutrient management, soil fertility and rational fertilization planning in Hetao Plain.

Key words: Hetao Plain, soil nutrient, spatial variability, grading evaluation, Hangjinhouqi

CLC Number:

S158.2

Qiang Chen, Jingsong Yang, Rongjiang Yao, Xiangping Wang, Wenping Xie, Fule Zheng, Hai Zhu, Shulin Wang. Spatial Variability of Soil Nutrients in Cultivated Land in Typical County of Hetao Plain[J]. Chinese Agricultural Science Bulletin, 2020, 36(10): 102-108.

Figures/Tables 5

References 35

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养分指标	有机质/(g/kg)	全氮/(g/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)
最小值	3.21	0.31	1.50	43.10
最大值	34.90	2.10	98.70	480.20
平均值	13.90	0.93	16.25	170.79
标准差	4.05	0.27	11.25	73.32
偏度	1.23	1.05	1.98	1.60
峰度	4.508	1.969	5.299	3.499
变异系数/%	29.16	29.61	69.21	42.93

养分指标	有机质/(g/kg)	全氮/(g/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)
最小值	3.21	0.31	1.50	43.10
最大值	34.90	2.10	98.70	480.20
平均值	13.90	0.93	16.25	170.79
标准差	4.05	0.27	11.25	73.32
偏度	1.23	1.05	1.98	1.60
峰度	4.508	1.969	5.299	3.499
变异系数/%	29.16	29.61	69.21	42.93

等级	有机质/(g/kg)	全氮/(g/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)
1级	[40,+∞)	[2, +∞)	[40, +∞)	[2000, +∞)
2级	[30,40)	[1.5,2)	[20,40)	[150,200)
3级	[20,30)	[1,1.5)	[10,20)	[100,150)
4级	[10,20)	[0.75,1)	[5,10)	[50,100)
5级	[6,10)	[0.5,0.75)	[3,5)	[30,50)
6级	[0,6)	[0,0.5)	[0,3)	[0,30)

等级	有机质/(g/kg)	全氮/(g/kg)	有效磷/(mg/kg)	速效钾/(mg/kg)
1级	[40,+∞)	[2, +∞)	[40, +∞)	[2000, +∞)
2级	[30,40)	[1.5,2)	[20,40)	[150,200)
3级	[20,30)	[1,1.5)	[10,20)	[100,150)
4级	[10,20)	[0.75,1)	[5,10)	[50,100)
5级	[6,10)	[0.5,0.75)	[3,5)	[30,50)
6级	[0,6)	[0,0.5)	[0,3)	[0,30)

养分指标	土层/cm	理论模型	块金值	基台值	块金系数	变程/m	决定系数	残差
有机质	0~20	指数	0.050	0.077	35.10	1990	0.123	0.0045
全氮	0~20	指数	0.005	0.078	94.00	1440	0.164	0.0065
有效磷	0~20	指数	0.037	0.365	89.90	1530	0.192	0.1000
速效钾	0~20	指数	0.074	0.148	50.30	3510	0.344	0.0109