小兴安岭3种原始红松混交林土壤nirK型反硝化微生物群落特征

doi:10.12302/j.issn.1000-2006.201902033

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南京林业大学学报（自然科学版） ›› 2021, Vol. 45 ›› Issue (2): 77-86.doi: 10.12302/j.issn.1000-2006.201902033

小兴安岭3种原始红松混交林土壤nirK型反硝化微生物群落特征

陈秀波¹^,²(), 段文标¹^,^*(), 陈立新¹, 朱德全³^,⁴, 赵晨晨³, 刘东旭³^,⁴

1.东北林业大学林学院,黑龙江哈尔滨 150040
2.贵州财经大学艺术学院,贵州贵阳 550025
3.佳木斯大学理学院,黑龙江佳木斯 154007
4.佳木斯大学中-乌农林技术开发与应用国际联合实验室,黑龙江佳木斯 154007

收稿日期:2019-02-27 接受日期:2020-11-26 出版日期:2021-03-30 发布日期:2021-04-09
通讯作者: 段文标
基金资助:
国家自然科学基金项目(31670627);国家自然科学基金项目(31770656)

Community structure and diversity of soil nirK-type denitrifying microorganisms in three forest types of primitive Pinus koraiensis mixed forest in Liangshui National Nature Reserve, Lesser Khingan Mountains

CHEN Xiubo¹^,²(), DUAN Wenbiao¹^,^*(), CHEN Lixin¹, ZHU Dequan³^,⁴, ZHAO Chenchen³, LIU Dongxu³^,⁴

1. College of Forestry, Northeast Forestry University, Harbin 150040, China
2. College of Art, Guizhou University of Finance and Economics, Guiyang 550025, China
3. College of Science, Jiamusi University, Jiamusi 154007, China
4. China-Ukraine International Joint Laboratory for Agricultural and Forestry Technology Development and Application, Jiamusi University, Jiamusi 154007,China

Received:2019-02-27 Accepted:2020-11-26 Online:2021-03-30 Published:2021-04-09
Contact: DUAN Wenbiao

摘要/Abstract

摘要：

【目的】分析小兴安岭地区3种典型原始红松林下土壤nirK型反硝化微生物的群落结构和多样性,探索影响原始红松林土壤nirK型反硝化微生物群落的关键土壤理化因子。【方法】在黑龙江省伊春市小兴安岭凉水自然保护区内采集3种原始红松林(云冷杉红松林、椴树红松林和枫桦红松林)林下土壤样品,提取土壤微生物总DNA,PCR扩增反硝化过程中的关键酶——硝酸盐还原酶的编码基因nirK高变区片段,采用Illumina MiSeq技术对其进行测序,并运用生物信息学技术分析nirK反硝化微生物的群落结构和多样性。【结果】共获得3种林型土壤nirK型基因的848 312条有效序列,761 912条优质序列,平均长度为320 bp。3种原始红松林土壤nirK型反硝化微生物分属于三界(细菌、古菌和无明确分类地位)。3种林型土壤中均含有大量未被鉴定的nirK型基因序列,在已鉴定的nirK型反硝化微生物中各林型均以变形菌门(Proteobacteria)为主,核心菌属为慢生根瘤菌属(Bradyrhizobium)、红假单胞菌属(Rhodopseudomonas)、固氮螺菌属(Azospirillum)和伯霍尔德杆菌属(Burkholderia)。α多样性分析显示:3种原始红松林nirK型反硝化微生物的4种α多样性指数(Shannon指数、Simpson指数、Ace指数和Chao1指数)没有显著差异。但β多样性分析显示:3种林型土壤nirK型反硝化微生物群落组成差异显著(R=0.25,P<0.05)。Metastats分析表明:3种林型土壤中丰度存在显著差异的是拟杆菌门(Bacteroidetes)、广古菌门(Euryarchaeota)和变形菌门(Proteobacteria)。土壤铵态氮和全氮含量是显著影响林下土壤nirK型反硝化微生物群落组成的主要理化因子(P<0.05)。【结论】3种原始红松林土壤理化性质差异没有对nirK型反硝化微生物的α多样性指数产生显著影响,但导致β多样性差异显著,其中铵态氮和全氮含量是显著影响3种原始红松林土壤nirK型反硝化微生物群落组成的主要因子。

关键词: 小兴安岭, 原始红松林, nirK基因, 反硝化微生物, 群落结构, 高通量测序, 凉水自然保护区

Abstract:

【Objective】The community structure and diversity characteristics of soil nirK-type denitrifying microorganisms in three types of primitive Pinus koraiensis forest (Picea asperata-Abies fabri-Pinus koraiensis forest, Tilia spp.-P. koraiensis forest, and Betula costata-P. koraiensis forest) were analyzed, and the key soil physicochemical factors affecting the soil nirK-type denitrifying microbial community were explored in the Liangshui National Nature Reserve of the Lesser Khingan Mountains.【Method】Soil samples of the selected three types of primitive P. koraiensis forest were collected in the Liangshui National Nature Reserve of the Lesser Khingan Mountains of Yichun City, Heilongjiang Province. Additionally, total soil microbial DNA was extracted, and variable range fragments of the nirK gene, which encodes the coding gene of nitrate reductase (a key enzyme in the denitrifying process), were amplified with PCR. The community composition and diversity characteristics of soil nirK-type denitrifying microorganisms in the different forest types of P. koraiensis were analyzed by using high-throughput sequencing and bioinformatic analysis.【Result】A total of 761 912 high-quality sequences of the 848 312 effective sequences of the nirK gene were obtained with high-throughput sequencing of 12 soil samples in the three types of primitive P. koraiensis forest, and the average length of these sequences was 320 bp. Soil nirK-type denitrifying microorganisms of the three forest types belong to bacteria and archaea.In addition there were a large number of sequences without clear classification information. The soil nirK denitrifying microorganisms identified in the three forest types belonged primarily to Proteobacteria at the Phylum level. However, the core genera included Bradyrhizobium, Rhodopseudomonas, Azospirillum and Burkholderia. Alpha diversity analysis showed that there was no significant difference in the four alpha diversity indices (Shannon, Chao1, Ace and Simpson index) of soil nirK-type denitrifying microorganisms among the three forest types. Beta diversity analysis showed that there were significant differences in the composition of soil nirK microbial communities among the three forest types (R=0.25, P=0.016). Metastats analysis showed that the significant differences in soil nirK microbial communities among the three forest types were with regards to Proteobacteria, Euryarchaeota and Bacteroidetes. Soil ammonium nitrogen and total nitrogen were the main soil physicochemical factors influencing soil nirK-type denitrifying microorganisms communities in the three forest types (P<0.05).【Conclusion】There was no significant difference in the alpha diversity index of the three primitive P. koraiensis forests (Shannon index, Simpson index, Ace index and Chao1 index), although beta diversity analysis showed that there were significant differences in the composition of the soil nirK microbial community among the three types of primitive P. koraiensis forest (R=0.25, P=0.016). Ammonium nitrogen and total nitrogen were the main soil physicochemical factors that significantly affected the soil nirK denitrifying microorganism in the three forest types.

Key words: Lesser Khingan Mountains, primitive Pinus koraiensis forest, nirK gene, denitrifying microorganisms, community structure, high-throughput sequencing, Liangshui National Nature Reserve

中图分类号:

S718.81

陈秀波,段文标,陈立新,等. 小兴安岭3种原始红松混交林土壤nirK型反硝化微生物群落特征[J]. 南京林业大学学报（自然科学版）, 2021, 45(2): 77-86.

CHEN Xiubo, DUAN Wenbiao, CHEN Lixin, ZHU Dequan, ZHAO Chenchen, LIU Dongxu. Community structure and diversity of soil nirK-type denitrifying microorganisms in three forest types of primitive Pinus koraiensis mixed forest in Liangshui National Nature Reserve, Lesser Khingan Mountains[J].Journal of Nanjing Forestry University (Natural Science Edition), 2021, 45(2): 77-86.DOI: 10.12302/j.issn.1000-2006.201902033.

图/表 8

表1

表2

小兴安岭3种原始红松混交林土壤理化性质"

林型 forest type	pH	土壤含水量/% soil water content	总有机碳/ (g·kg^-1) total organic carbon	全氮/ (g·kg^-1) total nitrogen	全磷/ (mg·kg^-1) total phosphorus	总孔隙度/% total porosity	土壤容重/ (g·cm^-3) soil bulk density	$NO 3 -$ -N含量/ (mg·kg^-1) content of $NO 3 -$ -N	N $H 4 +$ -N/ 含量 (mg·kg^-1) content of $NH 4 +$ -N
A	6.13±0.15 a	62.79±4.18 a	213.69±21.28 a	4.48±0.18 a	5.46±0.35 b	46.46±2.27 b	0.89±0.06 a	5.13±0.25 a	20.36±0.95 c
B	6.11±0.25 a	78.21±7.32 b	216.32±20.43 a	4.69±0.07 a	5.17±0.29 b	51.86±1.63 a	0.93±0.06 a	4.76±0.36 b	25.00±1.63 b
C	5.95±0.56 a	62.46±3.36 a	202.80±36.54 a	6.85±0.92 b	9.87±0.54 a	51.68±1.91 a	0.93±0.02 a	4.26±0.16 c	36.15±3.10 a

表2

图1

图2

表3

图3

图4

图5

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林型 forest type	林分密度/ (株·hm^-2) stand density	平均树高/m mean height	平均胸径/cm mean DBH	郁闭度/% canopy	主要植物 main plants
云冷杉红松林 Picea asperata and Abies fabri- Piuns koraiensis forest	156.00±40.00	25.27±1.51	50.33±4.25	81.50±4.51	冷杉(Abies fabri)、云杉(Picea asperata)、花楷槭(Acer ukurunduense)、青楷槭(A. tegmentosum)、五角槭(A. mono)
椴树红松林 Tilia spp.-Pinus koraiensis forest	128.00±39.19	26.37±1.67	54.45±6.26	84.50±5.45	槺椴(Tilia mandschurica)、紫椴(T. amurensis)、花楷槭(A. ukurunduense)、青楷槭(A. tegmentosum)、五角槭(A. mono)
枫桦红松林 Betula costata- Pinus koraiensis forest	128.00±42.10	28.60±2.60	59.80±8.40	89.50±6.30	枫桦(Betula costata)、五角槭(A. mono)、臭松(Abies nephrolepis)、稠李(Prunus padus)、青楷槭(A. tegmentosum)、椴树(Tilia spp.)、毛榛子(Corylus mandshurica)、瘤枝卫矛(Euonymus verrucosus)等

林型 forest types	Shannon 指数 Shannon index	Ace指数 Ace index	Chao1 指数 Chao1 index	Simpson 指数 Simpson index
云冷杉红松林 Picea asperata and Abies fabri- Pinus koraiensis forest	8.22± 0.18 a	1433± 329.86 a	1414± 303.83 a	0.99± 0.003 a
椴树红松林 Tilia spp.- P. koraiensis forest	7.79± 2.19 a	1844± 532.61 a	1779± 506.67 a	0.90± 0.16 a
枫桦红松林 Betula costata- P. koraiensis forest	7.45± 1.25 a	1630± 915.70 a	1578± 836.18 a	0.93± 0.04 a

小兴安岭3种原始红松混交林土壤nirK型反硝化微生物群落特征

Community structure and diversity of soil nirK-type denitrifying microorganisms in three forest types of primitive Pinus koraiensis mixed forest in Liangshui National Nature Reserve, Lesser Khingan Mountains

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