围网与围塘养鱼下沉积物微生物量和群落结构特征差异

doi:10.16258/j.cnki.1674-5906.2023.08.014

生态环境学报 ›› 2023, Vol. 32 ›› Issue (8): 1487-1495.DOI: 10.16258/j.cnki.1674-5906.2023.08.014

• 研究论文【环境科学】 • 上一篇下一篇

围网与围塘养鱼下沉积物微生物量和群落结构特征差异

梁川¹(), 杨艳芳²^,^*(), 俞姗姗¹, 周利¹, 张经纬¹, 张秀娟²

1.安徽师范大学地理与旅游学院/江淮流域地表过程与区域响应安徽省重点实验室，安徽芜湖 241002
2.安徽师范大学生态与环境学院，安徽芜湖 241002

收稿日期:2023-02-22 出版日期:2023-08-18 发布日期:2023-11-08
通讯作者: *杨艳芳。E-mail: yangyf1977@163.com
作者简介:梁川（1996年生），男，硕士，主要研究方向为土壤微生物生态。E-mail: joyecl1015@163.com
基金资助:
国家自然科学基金项目(41001369);安徽省自然科学基金项目(2108085MD126)

Differences of Microbial Biomass and Community Structure Characteristics in Sediments under Net-pen and Pond Fish Farming

LIANG Chuan¹(), YANG Yanfang²^,^*(), YU Shanshan¹, ZHOU Li¹, ZHANG Jingwei¹, ZHANG Xiujuan²

1. School of Geography and Tourism, Anhui Normal University/Key Laboratory of Earth Surface Processes and Regional Response in the Yangtze-Huaihe River Basin, Wuhu 241002, P. R. China
2. School of Ecology and Environment, Anhui Normal University, Wuhu 241002, P. R. China

Received:2023-02-22 Online:2023-08-18 Published:2023-11-08

摘要/Abstract

摘要：

沉积物微生物在水产养殖生态系统中起着至关重要的作用。围网和围塘养殖是长江中下游淡水湖泊两种主要渔业养殖模式，而当前对围网和围塘养殖模式下沉积物环境差异及其对微生物群落结构影响的了解甚少。采用磷脂脂肪酸（PLFAs）方法分析了菜子湖围网和围塘养殖区沉积物微生物量及其群落组成，应用相关性分析和冗余分析（RDA）方法探究养殖区沉积物微生物量和群落结构与沉积物环境因子间联系，并探讨沉积物微生物指标的生态指示意义。结果表明，养殖区沉积物微生物以细菌为主；围网养殖区季节性淹水沉积物微生物总生物量、细菌总生物量、厌氧菌、放线菌和真菌生物量显著高于围塘养殖区；而常年淹水沉积物微生物总生物量、细菌总生物量、各类细菌生物量和真菌生物量均显著性高于围塘养殖区。围网养殖区沉积物真菌生物量相对比例、F/B和Shannon指数显著高于围塘养殖区，其他各类群微生物生物量相对比例和G⁺/G^-在两种养殖模式下差异均不显著。沉积物粉粒、砂粒、有机质、有效磷等理化性质及抗生素类污染状况可能是解释两种养殖模式下沉积物微生物量和群落结构差异的主要环境因子。PLFAs指示下的沉积物微生物量和微生物群落结构均较灵敏地响应了围网和围塘养殖区的沉积物环境差异；同时围网养殖区沉积物生态系统相对于围塘养殖区更稳定。

关键词: 沉积物, 微生物群落结构, 微生物多样性, 微生物量, 围网养殖

Abstract:

Sediment microorganisms play a crucial role in aquaculture ecosystems. The net-open and pond fish farming are main fish farming models in freshwater lakes along the middle and lower reaches of the Yangtze River, however, there is little knowledge about environmental differences of sediments and their effects on microbial community structure. The differences in microbial biomass and community structure indicated by phospholipid fatty acid (PLFAs) were analyzed in sediments under net-pen and pond fish farming. Correlation analysis and redundancy analysis (RDA) were used to explore the relationship between microbial biomass in sediments, community structure indexes and sediment environmental factors, and the ecological significance of sediment microbial indicators was discussed. The results showed that bacteria dominated the sediment microorganisms. The total microbial biomass, total bacterial biomass, anaerobic bacterial biomass, actinomycete biomass, and fungal biomass in seasonal flooding sediments under net-pen fish farming were significantly higher than those under pond fish farming. Moreover, the total microbial biomass, total bacterial biomass, all species bacterial biomass, and fungal biomass in perennial flooding sediments under net-pen fish farming were significantly higher than those under pond fish farming. Furthermore, the percentage of fungi in total microbes, F/B and Shannon indices, in both seasonal flooding and perennial flooding sediments under the net-pen fish farming, were significantly higher than those under pond fish farming, while the percentage of other microbial groups and G⁺/G^-0020 showed no significant differences. The differences in physical and chemical properties of sediments such as silt, sand, organic matter, and available phosphorus, as well as the effects of antibiotic pollutants, were the main environmental factors that explained the differences in microbial biomass in sediments and community structure between the two fish farming modes. In conclusion, this study indicated that microbial biomass and community structure responded sensitively to the changes of sediment environments induced by fish farming modes. Meanwhile, the sediment ecosystem under net-pen fish farming seemed more stable than that under pond fish farming.

Key words: sediment, microbial community structure, microbial diversity, microbial biomass, net-pen fish farming

中图分类号:

X172
X52

梁川, 杨艳芳, 俞姗姗, 周利, 张经纬, 张秀娟. 围网与围塘养鱼下沉积物微生物量和群落结构特征差异[J]. 生态环境学报, 2023, 32(8): 1487-1495.

LIANG Chuan, YANG Yanfang, YU Shanshan, ZHOU Li, ZHANG Jingwei, ZHANG Xiujuan. Differences of Microbial Biomass and Community Structure Characteristics in Sediments under Net-pen and Pond Fish Farming[J]. Ecology and Environment, 2023, 32(8): 1487-1495.

图/表 6

表1 研究区沉积物基本理化性质特征

Table1 Basic physical and chemical properties of sediments in the studied area

生境		w_(粘粒)/%	w_(粉粒)/%	w_(砂砾)/%	pH	w_(有机质)/(g∙kg^-1)	w_(全磷)/(g∙kg^-1)	w_(有效磷)/(mg∙kg^-1)	w_(全氮)/(g∙kg^-1)	w_(碱解氮)/(mg∙kg^-1)
季节性淹水	围网	38.71±9.92a	51.59±5.86ab¹⁾	9.70±5.50a	5.13±0.32c	79.39±20.10a	0.68±0.08b	18.40±9.23a	2.01±0.62a	77.00±19.80b
季节性淹水	围塘	37.69±8.39a	52.46±4.92a	9.85±6.95a	5.54±0.42bc	62.55±31.00ab	0.69±0.15b	19.44±9.00a	1.76±0.96ab	108.11±40.23a
常年淹水	围网	30.30±7.28a	53.16±6.96a	16.55±10.83a	6.01±0.50ab	64.64±26.34ab	0.93±0.16a	17.29±9.98a	1.56±0.70ab	63.78±7.38b
常年淹水	围塘	35.18±13.52a	45.75±5.33c	19.08±14.92a	6.26±0.39a	40.85±10.91c	1.13±0.28a	22.16±7.04a	1.03±0.45c	77.00±18.52b

表2 研究区不同养殖模式下沉积物微生物PLFAs含量

Table2 The amount of sediment microbial PLFAs under different fish farming models in the studied area

生境		微生物PLFAs总量/ (nmol∙g^-1)	细菌PLFAs含量/(nmol∙g^-1)					真菌PLFAs含量/ (nmol∙g^-1)
生境		微生物PLFAs总量/ (nmol∙g^-1)	G⁺细菌	G^-细菌	放线菌	厌氧菌	总PLFAs	真菌PLFAs含量/ (nmol∙g^-1)
季节性淹水	围网	44.56±12.44b	10.81±3.19b	12.49±3.48bc	4.64±0.97a	0.56±0.19a	39.44±10.95b	1.72±0.37b
季节性淹水	围塘	25.15±10.48c	6.56±3.01b	6.83±2.85c	2.65±1.36b	0.31±0.18b	22.60±9.62c	0.73±0.35c
常年淹水	围网	93.85±21.86a	22.14±5.38a	28.27±10.58a	4.51±1.10a	0.72±0.19a	73.45±20.09a	4.81±1.22a
常年淹水	围塘	45.02±7.51b	10.79±2.49b	14.45±3.24b	2.32±0.37b	0.28±0.07b	38.53±6.29bc	1.83±0.27b

图1 不同养殖模式下微生物各种群PLFAs含量相对比例及其显著性检验 WWJ：围网养殖区季节性淹水沉积物；WTJ：围塘养殖区季节性淹水沉积物；WWC：围网养殖区常年淹水沉积物；WTC：围塘养殖区常年淹水沉积物（不同小写字母表示同一类群微生物PLFAs含量相对比例在不同生境下差异显著，P<0.05；n=9）

Figure 1 Relative proportions of different microbial population PLFAs in total microbial PLFAs under different fish farming models and their significance tests

表3 研究区沉积物菌类比值和微生物多样性指数

Table 3 Ratio of different microbial population and microbial diversity index of sediments in the studied area

生境		菌类比值		Alpha 多样性指数
生境		F/B	G⁺/G^-	Simpson指数	Shannon指数
季节性淹水	围网	0.17±0.04b	0.87±0.09a	0.06±0.01c	3.20±0.12a
季节性淹水	围塘	0.12±0.03b	1.01±0.27a	0.07±0.02bc	2.91±0.09b
常年淹水	围网	0.31±0.18a	0.86±0.03a	0.08±0.01ab	3.08±0.13a
常年淹水	围塘	0.18±0.04b	0.78±0.25a	0.09±0.01a	2.81±0.06b

图2 研究区微生物量和群落结构指标与环境因子的相关性分析沉积物微生物量（Ⅰ季节性淹水；Ⅱ常年淹水）和群落结构指标（Ⅲ季节性淹水；Ⅳ常年淹水）与环境因子的相关性分析（*P<0.5，**P<0.01，n=18）

Figure 2 Correlation analysis of bacterial biomass and community structure indexes with environmental factors in the studied area

图3 研究区微生物生物量和群落结构指标与环境因子的RDA分析

Figure 3 RDA analysis of microbial biomass and community structure indexes and environmental factors in the studied area

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围网与围塘养鱼下沉积物微生物量和群落结构特征差异

Differences of Microbial Biomass and Community Structure Characteristics in Sediments under Net-pen and Pond Fish Farming

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