Study on the effect of urban topsoil sampling interval on the variation pattern of magnetic susceptibility of soil profile

doi:10.12302/j.issn.1000-2006.202203060

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (6): 61-69.doi: 10.12302/j.issn.1000-2006.202203060

Special Issue: 山水林田湖草一体化保护和生态修复——土壤侵蚀修复研究

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Study on the effect of urban topsoil sampling interval on the variation pattern of magnetic susceptibility of soil profile

CHEN Ming(), LIU Liang()

College of Forestry and Grassland, College of Soil and Water Conservation, Co-Innovation Center for Sustainable Forestry in Southern China, Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological Restoration, Nanjing Forestry University, Nanjing 210037, China

Received:2022-03-28 Revised:2022-07-09 Online:2023-11-30 Published:2023-11-23

Abstract

Abstract:

【Objective】 This study explored the influence of sampling interval on the measurement accuracy of urban soil magnetic susceptibility. 【Method】 Taking typical forest land in Nanjing and its suburbs as the research object, four representative sample plots (suburban forest farms, urban forest farms, undisturbed land and disturbed road green belts) were selected, and 0-30 cm topsoil samples were collected. Taking soil magnetic susceptibility as the main index, five topsoil sampling intervals (2, 5, 10, 15 and 30 cm) were set. The profile variation characteristics of surface soil mass susceptibility and percentage frequency susceptibility at different sampling intervals were analyzed. 【Result】Soil low frequency mass susceptibility (χ_lf) of the four sample plots ranged from 59.2 × 10^-8 to 1 210.0 × 10^-8 m³/kg, with a peak value of 5-7 cm. Low frequency magnetic susceptibility of soil profiles in all plots basically followed the pattern of first increasing and then decreasing and fluctuating. Fine sampling intervals (such as 2 cm) better captured the peak value and abnormal values of soil magnetic susceptibility; the 5 and 10 cm soil sampling intervals reflected the general variation trend of soil magnetic susceptibility; the soil sampling interval of 15 cm showed no detail in the soil magnetic susceptibility changes. Mixed soil samples at 0-30 cm soil sampling intervals only indicated the mean value of magnetic susceptibility of various surface soils. 【Conclusion】 During the sampling process, appropriate sampling intervals should be set according to the research purpose in order to improve the accuracy of experimental data.

Key words: magnetic susceptibility, topsoil sampling, soil profile, profile stratified samples, profile mixed samples, Nanjing City

CLC Number:

S714
X53

CHEN Ming, LIU Liang. Study on the effect of urban topsoil sampling interval on the variation pattern of magnetic susceptibility of soil profile[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(6): 61-69.

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References 45

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样地类型 sample plot type	样本量 sample size	χ_lf/(×10^-8 m³·kg^-1) massic magnetic susceptibility									χ_hf/% frequency-dependent magnetic susceptibility
样地类型 sample plot type	样本量 sample size	平均值 average	最小值 min		最大值 max		标准差 SD		变异系数 CV		平均值 average	最小值 min	最大值 max	标准差 SD	变异系数 CV
城郊林地(SF)suburban forest	84	78.2		59.2		127.0		16.1		20.5	11.4	6.9	14.5	1.5	13.1
城内林地(UF) urban forest	80	523.6		177.0		1 210.0		155.8		29.8	0.9	0	4.3	0.7	79.8
道路绿化带(未扰动) (UDG)road greenbelt	84	137.9		107.4		182.4		14.4		10.4	10.2	6.8	12.8	1.4	14.1
道路绿化带(扰动)(DG) road greenbelt(disturbance)	84	150.3		102.7		230.1		21.8		14.5	8.6	3.6	12.5	2.2	25.5

样地类型 sample plot type	质量磁化率/(×10^-8 m³·kg^-1) massic magnetic susceptibility					百分比频率磁化率/% frequency-dependent magnetic susceptibility
样地类型 sample plot type	2 cm	5 cm	10 cm	15 cm	30 cm	2 cm	5 cm	10 cm	15 cm	30 cm
城郊林地SF	78.9	79.0	79.1	72.3	74.0	11.4	11.6	11.3	10.3	12.4
城内林地UF	528.8	517.6	481.9	528.9	539.1	0.7	0.7	1.0	0.7	1.1
道路绿化带(未扰动)UDG	137.8	136.0	139.4	136.3	137.5	10.1	10.4	10.8	10.4	10.2
道路绿化带(扰动)DG	150.5	155.0	146.1	147.1	141.4	8.4	8.6	8.9	9.0	10.1

研究尺度 research scale	自然林地 natural forest		潜在污染林地 potentially polluted forest		扰动道路绿化带 disturbed road green belt		未扰动道路绿化带 undisturbed road green belt
研究尺度 research scale	间隔/cm interval	深度/cm depth	间隔/cm interval	深度/cm depth	间隔/cm interval	深度/cm depth	间隔/cm interval	深度/cm depth
垂直变异性vertical variability	2、5	20	2	>50	2	>30	2、5	20
小尺度空间small scale space	10	20	5、10	30	10	30	10	20
大尺度空间large scale space	20	20	10	30	10	20	20	20

Study on the effect of urban topsoil sampling interval on the variation pattern of magnetic susceptibility of soil profile

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采样间隔/cm sampling interval	样品数量/个 sample quantity	耗时/min sampling time
2	15	30
5	6	20
10	3	12
15	2	8
20	1	4
30	1	5