雄安新区典型土地利用转变方式下土壤病原细菌特征及其对微塑料的响应

doi:10.11707/j.1001-7488.LYKX20230711

Abstract

Abstract:

Objective: The aim of this study was to clarify the characteristics of soil microplastics and pathogenic bacteria communities under typical land-use conversion patterns in Xiong'an New Area, and reveal the potential risk of soil microplastics on soil pathogenic bacteria, which offers a scientific basis for prevention and management strategies about soil microplastics and pathogenic bacteria. Method: The soils of six typical land-use conversion patterns in Xiong'an New Area were taken as the research objects. The laser infrared imaging spectrometer and third-generation high-throughput sequence technology were used to analyze the characteristics of soil microplastics and pathogenic bacterial communities in typical land-use conversion modes in Xiong'an New Area. Combined with the quantitative risk assessment method of environmental microbiome, the potential soil pathogens risk of human health was identified; the land-use conversion, soil physicochemical properties, and the abundance, composition, and polymer types of microplastics on the soil pathogenic bacteria risk index were elucidated. Result: The average abundance of soil microplastics in urban infrastructure construction was higher than that of other land-use types, and polyurethane (PU) and silicone resin (SR) were the main microplastics types of typical land-use conversion patterns in Xiong'an New Area. Soil microplastics abundance showed a significant positive correlation with the pathogenic bacteria risk index and soil nitrate nitrogen (NO₃^?-N), and had a significant negative correlation with soil water content (SWC). The microplastics such as SR, Acrylate copolymer (ACR) and Polyethylene terephthalate (PET) were enriched in the alkaline soil environment. The abundance of animal pathogenic bacteria in soils undergoing six typical land-use conversions in Xiong'an New Area was significantly higher than that of both zoonotic and plant pathogenic bacteria, with zoonotic bacteria also more abundant than plant pathogenic bacteria. The abundance of specialist soil pathogenic bacteria in urban infrastructure construction land was the highest among the six land-use modes, characterized by substantial community heterogeneity, robust interspecies cooperation, suggesting a significant potential pollution risk to human health. Conclusion: Land-use conversion patterns directly affects the pollution risk of soil pathogenic bacteria, highlighting the role of ecological and environmental management of Baiyangdian in controlling pathogenic bacterial pollution. However, the enriched microplastics particles (such as polyethylene, polypropylene, polyvinylchloride, and PET) during the construction process, residual films of controlled-release fertilizers in agricultural soils, and petroleum chemical wastewater residues (such as PU and SR) further exacerbate the potential risk of soil pathogenic bacteria to human health.

Key words: Xiong'an New Area, land-use conversion, soil microplastics, pathogenic bacteria, risk index

CLC Number:

Can Wang, Masoudi Abolfazl,Min Wang,Ze Zhang,Jingkun Cao,Yuhao Xu,Zhijun Yu,Jingze Liu. Characteristics of Soil Pathogenic Bacteria and Their Response to Microplastics under Typical Land-use Conversion Patterns in Xiong’an New Area[J]. Scientia Silvae Sinicae, 2025, 61(7): 231-240.

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土地利用转变方式 Land-use conversion patterns	土地利用现状分类（一级类） Current land use classification （first category）	生境类型 Habitat types	样品名 Sample name	采样坐标点 Sampling sites
水稻田→草地 Rice paddy → Grassland	耕地→草地 Farmland → Grassland	水生→陆生 Aquatic habitat → Terrestrial habitat	AR_TG	38°53′17″N，115°45′34″E
水稻田→人工湿地（主要植物为芦苇） Rice paddy → Constructed wetland (the main plant is Phragmites australis)	耕地→水域用地 Farmland → Wetland	陆生→水生 Terrestrial habitat → Aquatic habitat	AR_ACW	38°54′07″N，115°48′12″E
玉米地 →人工湿地（主要植物为芦苇）Maize land → Constructed wetland (the main plant is Phragmites australis)	耕地→水域用地 Farmland → Wetland	陆生→水生 Terrestrial habitat → Aquatic habitat	THM_ACW	38°53′59″N，115°47′25″E
草地→建设用地 Grassland → Urban infrastructure construction	草地→商服用地/住宅用地/公共管理与公共服务用地 Grassland → Commercial and service land / residential land / public administration and public service land	无变化 No change	TG_THC	39°03′26″N，115°55′16″E
玉米地→林地（杜仲） Maize land → Plantation (Eucommia ulmoides)	耕地→林地 Farmland → Woodland	无变化 No change	THM_TF	38°53′39″N，115°45′02″E
小麦地→玉米地（轮作） Wheat land → Maize land (rotation)	耕地→耕地 Farmland →Farmland	无变化 No change	TW_THM	38°56′15″N，115°45′31″E

指数Index		AR_TG	AR_ACW	THM_ACW	TG_THC	THM_TF	TW_THM
Alpha多样性 Alpha diversity	动物Animal	2.419 ± 0.254a	2.481 ± 0.207a	2.460 ± 0.1626a	2.446 ± 0.651a	2.491 ± 0.11685a	2.526 ± 0.239a
	植物Plant	1.076 ± 0.491a	1.223 ± 0.096a	1.264 ± 0.092a	1.143 ± 0.351a	1.315 ± 0.210a	1.262 ± 0.360a
	人畜共患Zoonotic	1.458 ± 0.292a	1.467 ± 0.276a	1.563 ± 0.293a	1.604 ± 0.257a	1.577 ± 0.167a	1.566 ± 0.238a
群落构建过程 Community assembly	m （NCM）	0.742	0.857	1.011	0.497	1.134	1.173
群落构建过程 Community assembly	R² （NCM）	0.244	0.208	0.264	0.208	0.284	0.275
群落不相似性 Community dissimilarity	βMNTD	0.052 ± 0.009b	0.056 ± 0.009b	0.044 ± 0.005c	0.076 ± 0.032a	0.040 ± 0.004c	0.037 ± 0.004c
	Bray-Curtis	0.502 ± 0.103bc	0.514 ± 0.108b	0.455 ± 0.050c	0.630 ± 0.148a	0.334 ± 0.049e	0.387 ± 0.062d
	Jaccard	0.600 ± 0.060b	0.599 ± 0.041b	0.530 ± 0.022c	0.653 ± 0.118a	0.492 ± 0.036d	0.519 ± 0.031cd

土壤病原细菌风险评价指标 Indicators of soil pathogenic bacteria risk evaluation	AR_TG	AR_ACW	THM_ACW	TG_THC	THM_TF	TW_THM	综合加权值 Comprehensive weight
绝对丰度 Absolute abundance	4179	3656	4395	8021	5083	5359	0.093
节点数 Node number	134	141	172	73	206	210	0.114
边数 Edge number	797	801	1113	363	1466	1634	0.157
正相关关系占比 Proportion of positive correlation	53.7%	58.8%	53.19%	72.73%	55.59%	62.12%	/
负相关关系占比 Proportion of negative correlation	46.3%	41.2%	46.81%	27.27%	44.41%	37.88%	/
平均加权度 Average weighted degree	10.516	10.015	11.336	8.807	12.478	13.661	0.050
直径 Diameter	7	7	6	10	6	6	0.071
图密度 Graph density	0.089	0.081	0.076	0.138	0.069	0.074	0.091
模块化 Modularity	0.502	0.543	0.530	0.435	0.586	0.501	0.029
平均聚类系数 Average clustering coefficient	0.505	0.495	0.503	0.578	0.488	0.487	0.022
平均路径长度 Average path length	3.047	3.099	3.033	3.162	2.966	2.956	0.008
土壤暴露时间 Soil exposure time/(mg·d^-1)	130	80	100	150	200	220	0.129
人类土壤暴露百分比 Human soil exposure percentage (%)	45	25	30	50	56	68.7	0.120
土壤摄食率 Soil ingestion rate/(mg·d^-1)	90	50	70	100	120	130	0.110
风险指数 Risk index	0.388	0.274	0.286	0.751	0.401	0.433	/

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Characteristics of Soil Pathogenic Bacteria and Their Response to Microplastics under Typical Land-use Conversion Patterns in Xiong’an New Area

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