Soil fertility spatial distribution and characteristics of roadside trees in Shanghai

doi:10.12302/j.issn.1000-2006.202206018

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (3): 164-172.doi: 10.12302/j.issn.1000-2006.202206018

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Soil fertility spatial distribution and characteristics of roadside trees in Shanghai

HE Kun¹(), WANG Junjie¹, WANG Benyao²^,^*(), ZHU Haijun³, FENG Shucheng²

1. The Ecological Technology and Engineering School of Shanghai Institute of Technology,Shanghai 201418,China
2. The Shanghai Administrative & Directive Station for Afforestation, Shanghai 201020, China
3. Jiangsu Academy of Agriculture Sciences, Nanjing 210014, China

Received:2022-06-13 Revised:2022-07-19 Online:2023-05-30 Published:2023-05-25
Contact: WANG Benyao E-mail:hekun@sit.edu.cn;wangbenyao@163.com

Abstract

Abstract:

【Objective】The main objective of this study is to comprehensively evaluate the soil fertility characteristics and spatial distribution of street trees in Shanghai City, to promote their effective management by improving health and soil quality, optimizing fertilization, and ensuring the sustainable development of green infrastructure.【Method】We collected tree soil samples from 136 roads across 16 administrative districts in Shanghai, China and measured soil fertility indices, such as soil bulk density, pH and main nutrient contents. Combining single factor analysis and GIS spatial distribution, we evaluated the soil fertility characteristics of street trees in Shanghai. 【Result】The results showed that street tree soil in Shanghai was predominantly silt loam, highly alkaline, and had a high average soil bulk density. Except for available potassium, main nutrient indices contents such as organic matter, total and available nitrogen, and available phosphorus were low, and soil nutrient spatial distributions varied greatly. Available calcium content in street tree soil was much higher than that of the highest planting requirements in Shanghai overall; however, it was considered to be low level based on the integrated fertility index (IFI) of street tree soils, which showed a general trend of being low in the middle and high in the periphery. The IFI showed a significant positive correlation with organic matter, total nitrogen, available nitrogen, available phosphorus and available sulfur, whereas it had significantly negative correlation with pH and available calcium. 【Conclusion】The IFI of street trees in Shanghai was generally low, and soil fertility differed significantly between administrative regions; however, no clear correlation was found. The street tree soil management and improvement should consider spatial distribution characteristics and practical measures such as reducing soil pH and increasing soil organic matter according to local conditions to improve street tree soil fertility.

Key words: street tree, soil nutrient, physical and chemical properties, integrated fertility index, Shanghai municipality

CLC Number:

S731.8

HE Kun, WANG Junjie, WANG Benyao, ZHU Haijun, FENG Shucheng. Soil fertility spatial distribution and characteristics of roadside trees in Shanghai[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(3): 164-172.

Figures/Tables 6

Fig.1

Table 1

Table 2

Fig.2

Fig.3

Table 3

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分级 classification	有机质含量/ (g·kg^-1) OM content	全氮含量/ (g·kg^-1) TN content	碱解氮含量/ (mg·kg^-1) AN content	有效磷含量/ (mg·kg^-1) AP content	速效钾含量/ (mg·kg^-1) AK content	有效钙含量/ (mg·kg^-1) ACa content	有效镁含量/ (mg·kg^-1) AMg content	有效硫含量/ (mg·kg^-1) AS content
6	<6	<0.50	<30	<3	<30
5	≥6~10	≥0.50~0.75	≥30~60	≥3~5	≥30~50	<200	<50	<10
4	≥10~20	≥0.75~1.00	≥60~90	≥5~10	≥50~100	≥200~400	≥50~100	≥10~15
3	≥20~30	≥1.00~1.50	≥90~120	≥10~20	≥100~150	≥400~1 200	≥100~200	≥15~30
2	≥30~40	≥1.50~2.00	≥120~150	≥20~40	≥150~200	≥1 200~2 500	≥200~300	≥30~50
1	>40	>2.00	>150	>40	>200	>2 500	>300	>50

指标 parameter	平均值 mean	标准误 SE	变幅 range	变异系数/% CV
黏粒/% clay	3.65	0.09	0.91~6.44	29.59
粉粒/% silt	85.49	0.53	61.12~96.58	7.24
砂粒/% sand	10.84	0.59	0~37.91	63.56
土壤容重/(g·cm^-3) soil BD	1.38	0.01	0.96~1.71	10.87
总孔隙度/% total porosity	47.92	0.49	35.42~63.86	11.94
通气孔隙度/% aeration porosity	24.53	0.80	3.61~49.18	38.20
pH	8.43	0.02	5.79~8.91	3.20
电导率/(μS ·cm^-1) EC	198.99	8.82	102.40~971.00	51.70
有机质含量/(g·kg^-1) OM content	15.92	0.43	7.72~32.30	31.15
全氮含量/(g·kg^-1) TN content	0.86	0.02	0.44~2.07	28.74
碱解氮含量/(mg·kg^-1) AN content	56.10	1.73	22.93~147.60	36.02
有效磷含量/(mg·kg^-1) AP content	13.01	1.15	0.51~61.93	103.38
速效钾含量/(mg·kg^-1) AK content	187.93	7.69	81.26~662.68	47.76
有效钙含量/(mg·kg^-1) ACa content	3 851.50	32.59	2 173.17~4 991.47	9.87
有效镁含量/(mg·kg^-1) AMg content	129.40	1.71	87.74~197.27	15.42
有效硫含量/(mg·kg^-1) AS content	20.90	1.45	2.64~129.26	80.71

指标 parameter	IFI	BD	pH	OM	TN	AN	AP	AK	ACa	AMg
IFI	1
BD	-0.138	1
pH	-0.551^***	-0.020	1
OM	0.674^***	-0.247^**	-0.431^***	1
TN	0.669^***	-0.195^*	-0.558^***	0.792^***	1
AN	0.632^***	-0.157	-0.520^***	0.696^***	0.754^***	1
AP	0.609^***	-0.113	-0.462^***	0.383^***	0.356^***	0.400^***	1
AK	0.186^*	-0.136	-0.046	0.167	0.140	0.159	0.233^**	1
ACa	-0.196^*	-0.231^**	0.482^***	0.092	-0.012	-0.102	-0.167	0.176^*	1
AMg	0.002	0.071	0.050	-0.181^*	-0.044	-0.013	-0.051	-0.013	-0.021	1
AS	0.310^***	-0.116	-0.252^**	0.159	0.085	0.137	0.271^**	0.053	-0.157	-0.058

Soil fertility spatial distribution and characteristics of roadside trees in Shanghai

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