泰山4种优势造林树种细根分解对细菌群落结构的影响

doi:10.17521/cjpe.2018.0120

植物生态学报 ›› 2018, Vol. 42 ›› Issue (12): 1200-1210.DOI: 10.17521/cjpe.2018.0120

所属专题：凋落物；微生物生态学

泰山4种优势造林树种细根分解对细菌群落结构的影响

路颖,李坤,倪瑞强,梁强,李传荣,张彩虹()

黄河下游森林培育国家林业局重点实验室, 山东泰安 271018

收稿日期:2018-02-21 修回日期:2018-10-31 出版日期:2018-12-20 发布日期:2019-04-04
通讯作者: 张彩虹
基金资助:
国家自然科学基金(31500362);国家自然科学基金(31570705);山东省联合专项(ZR2014CL005);山东省“双一流”奖补资金(SYL2017XTTD03)

Effects of fine root decomposition on bacterial community structure of four dominated tree species in Mount Taishan, China

LU Ying,LI Kun,NI Rui-Qiang,LIANG Qiang,LI Chuan-Rong,ZHANG Cai-Hong()

Taishan Forest Ecosystem Research Station of the State Forestry Administration, Tai’an, Shandong 271018, China; and Key Labora-tory of State Forestry Administration for Silviculture of the Lower Yellow River, Tai’an, Shandong 271018, China

Received:2018-02-21 Revised:2018-10-31 Online:2018-12-20 Published:2019-04-04
Contact: Cai-Hong ZHANG
Supported by:
Supported by the National Natural Science Foundation of China(31500362);Supported by the National Natural Science Foundation of China(31570705);the Joint Special Project of Shandong Province(ZR2014CL005);the Funds of Shandong “Double Tops” Program(SYL2017XTTD03)

摘要/Abstract

摘要：

为了理解细菌群落结构和多样性对森林生态系统细根凋落物分解的影响, 该研究以泰山4种主要优势造林树种刺槐(Robinia pseudoacacia)、麻栎(Quercus acutissima)、油松(Pinus tabulaeformis)和赤松(Pinus densiflora)为研究对象, 采用凋落物分解袋法及Illumina Miseq测序平台对细菌16S rDNA V4-V5区扩增产物进行双端测序, 分析了4种树种细根分解对细菌群落结构及多样性的影响。结果表明: (1) 4种植物细根分解速率差异显著, 阔叶树种分解速率显著高于针叶树种, 表现为刺槐>麻栎>油松>赤松。(2) 4个树种细菌序列操作分类单元(OTU)、观测到的物种数、Ace指数和系统发育多样性之间差异显著, 且阔叶树种刺槐和麻栎显著低于针叶树种赤松和油松。4种细根分解的细菌群落结构存在极显著差异。细根初始碳(C)含量、木质素:氮(N)和C:N对细菌群落结构的影响较大。(3)细菌群落相对丰度在5%以上的优势类群是变形菌门、放线菌门、拟杆菌门、酸杆菌门, 且变形菌门、酸杆菌门在4个树种之间差异显著, 特别是阔叶树种变形菌门显著高于针叶树种。在纲水平上, α-变形菌纲、β-变形菌纲、γ-变形菌纲、不明放线菌纲、鞘脂杆菌纲为主要的优势纲, 其中α-变形菌纲、不明放线菌纲在4个树种之间差异显著。(4) Pearson相关性分析表明, 细菌优势门和纲相对丰度受到凋落物初始化学性质的影响, 特别是变形菌门和α-变形菌纲; 变形菌门和α-变形菌纲相对丰度与细根分解速率显著正相关。冗余分析结果也显示, 细根初始N、磷(P)含量和木质素含量对细菌群落结构的影响较大。研究结果有助于理解细菌群落结构和多样性对森林生态系统细根凋落物分解的影响。

关键词: 分解, 细根, 细菌群落, 多样性

Abstract:

Aims Microorganisms play a crucial role in the litter decomposition process in terrestrial ecosystems. Understanding the independent and interactive relationship between fine root decomposition and bacteria community related to substrate characteristics can help to predict the consequences of changes on ecosystem function. Therefore, the aim of this study was to identify fine roots’ influences on rhizosphere microbial structure and diversity.

Methods The decomposition of root litters of four dominant tree species of Mount Taishan (Robinia pseudoacacia(RP), Quercus acutissima(QA), Pinus tabulaeformis(PT) and Pinus densiflora(PD)) was tested in a Yaoxiang Forest Farm. Using Illumina high-throughput sequencing of 16S rRNA genes, bacterial community composition was determined. Composition, diversity and relative abundance of bacteria were calculated for per fine root litter.

Important findings (1) Fine root litter decomposition differed significantly among different root types. There was no difference in decomposition rate between broad-leaved species and conifer species. In all species, fine roots of RP and QA were more strongly decomposed than that of PT and PD, and these differences were significant (RP > QA > PT > PD). (2) The number of observed species, operational taxonomic units, Ace index and phylogenetic diversity in broad-leaved species were significantly lower than that in coniferous species. Bacterial community structure differed significantly among four species for root decomposition. Initial carbon (C), lignin:nitrogen (N) and C:N in fine root had a great influence on the bacterial community structure. (3) At the phylum level, a total of 4 phyla were dominant (>5% across all species). Based on the average relative abundance, the most abundant phyla were Proteobacteria, Actinomyces, Bacteroidetes and Acidobacteria. Proteobacteria’s and Acidbacteria’s abundance were significantly different among the four species. Particularly, the Proteobacteria of broad-leaved species was significantly higher than that of coniferous species. At the class level, a wide range of classes dominated. Based on the average relative abundance, the most abundance classes were Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, unidentified-Actinobacteria and Sphingobacteriia. Alphaproteobacteria and unidentified-Actinobacteria had significant differences among the four species. (4) Pearson correlation analysis showed that the relative abundance of dominant phylum and class was affected by the initial properties of root litter, especially the Proteobacteria and Alphaproteobacteria. In addition, there was a significant positive correlation between fine root decomposition rate and relative abundance of Proteobacteria and Alphaproteobacteria. Redundancy analysis (RDA) also demonstrated that the initial properties of fine root litter (initial N, P, C:N) had significant effects on the structures of bacterial community. These results can improve understanding the links between fine root litter decomposition and functional microbial communities.

Key words: decomposition, fine root, bacterial community, diversity

路颖, 李坤, 倪瑞强, 梁强, 李传荣, 张彩虹. 泰山4种优势造林树种细根分解对细菌群落结构的影响. 植物生态学报, 2018, 42(12): 1200-1210. DOI: 10.17521/cjpe.2018.0120

LU Ying, LI Kun, NI Rui-Qiang, LIANG Qiang, LI Chuan-Rong, ZHANG Cai-Hong. Effects of fine root decomposition on bacterial community structure of four dominated tree species in Mount Taishan, China. Chinese Journal of Plant Ecology, 2018, 42(12): 1200-1210. DOI: 10.17521/cjpe.2018.0120

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2018.0120

https://www.plant-ecology.com/CN/Y2018/V42/I12/1200

图/表 10

表1 泰山4个树种细根凋落物初始化学元素含量的差异(平均值±标准误差, n = 3)

Table 1 Differences in initial element contents of fine root litter (mean ± SE, n = 3)

树种 Species	C (%)	N (%)	P (%)	C:N	N:P	木质素 Lignin (%)
RP	48.77 ± 0.33^c	3.36 ± 0.002^a	0.53 ± 0.05^a	14.51 ± 0.09^d	6.36 ± 0.34^a	29.59 ± 0.47^c
QA	46.39 ± 0.17^d	1.08 ± 0.008^b	0.46 ± 0.01^a	43.02 ± 0.17^c	2.34 ± 0.05^b	33.78 ± 0.60^b
PD	54.65 ± 0.17^a	0.38 ± 0.009^d	0.39 ± 0.03^b	142.48 ± 3.72^a	1.00 ± 0.07^c	38.34 ± 0.30^a
PT	49.96 ± 0.13^b	0.85 ± 0.004^c	0.41 ± 0.03^b	59.04 ± 0.19^b	2.10 ± 0.14^b	37.78 ± 0.15^a

图1 泰山4种植物分解速率之间的差异(平均值±标准误差)。PD, 赤松; PT, 油松; QA, 麻栎; RP, 刺槐。不同小写字母代表不同树种之间差异显著(p < 0.05)。

Fig. 1 Difference in decomposition rate among four litter species (mean ± SE) in Mount Taishan. PD, Pinus densiflora; PT, Pinus tabulaeformis; QA, Quercus acutissima; RP, Robinia pseudoacacia. Different lowercase letters represent significant differences among different species (p < 0.05).

表2 细根分解一年后泰山细菌多样性统计分析(平均值±标准误差, n = 3)

Table 2 Statistical analysis of bacterial diversity in Mount Taishan after one year of fine root decomposition (mean ± SE, n = 3)

树种 Species	物种数 NO. of observed species	覆盖率Coverage (%)	Chao1指数 Chao1 index	Ace指数 Ace index	系统发育多样性Phylogenetic diversity	Shannon-Wiener指数Shannon-Wiener index
RP	2 149 ± 71^a	98.6 ± 0.1^b	3 088.0 ± 140.4^ab	3 062.2 ± 143.5^ab	159.2 ± 4.2^a	8.38 ± 0.59^a
QA	1 970 ± 120^a	97.7 ± 0.2^a	2 824.2 ± 88.5^a	2 843.8 ± 62.0^a	147.8 ± 7.6^a	8.14 ± 0.16^a
PD	2 759 ± 25^b	98.3 ± 0.2^ab	3 544.7 ± 50.3^c	3 530.6 ± 34.3^c	198.6 ± 5.1^b	8.81 ± 0.35^b
PT	2 568 ± 39^b	97.6 ± 0.2^a	3 395.0 ± 2.2^bc	3 341.9 ± 68.4^bc	193.1 ± 3.2^b	8.88 ± 0.18^b

表3 分解一年后细菌α多样性与凋落物初始化学性质之间的相关分析

Table 3 Correlation analysis between bacterial α diversity and the initial properties of litter after one year of decomposition

	C (%)	N (%)	P (%)	C:N	N:P	木质素 Lignin (%)
物种数 NO. Of observed species	0.884^**	-0.541	0.679^*	0.790^*	-0.496	0.726^*
覆盖率 Coverage (%)	0.331	0.437	-0.482	0.126	0.517	-0.344
Chao1指数 Chao1 index	0.858^**	-0.413	0.608	0.706^*	-0.377	0.642
Ace指数 Ace index	0.874^**	-0.446	0.593	0.748^*	-0.405	0.661^*
系统发育多样性 Phylogenetic diversity	0.829^*	-0.547	0.744^*	0.730^*	-0.515	0.749^*
Shannon-Wiener指数 Shannon-Wiener index	0.552	-0.292	0.491	0.378	-0.246	0.418

图2 细根分解一年后泰山细菌群落结构的非度量多维尺度分析(NMDS)排序图。PD, 赤松; PT, 油松; QA, 麻栎; RP, 刺槐。

Fig. 2 Nonmetric Multidimensional Scaling (NMDS) ordination diagram of bacterial community structure in root litter after one year of decomposition in Mount Taishan. PD, Pinus densiflora; PT, Pinus tabulaeformis; QA, Quercus acutissima; RP, Robinia pseudoacacia.

图3 细菌群落结构与细根初始化学性质的冗余分析(RDA)。PD, 赤松; PT, 油松; QA, 麻栎; RP, 刺槐。

Fig. 3 Redundancy analysis (RDA) based on bacterial community structure and the initial properties of fine root litter. PD, Pinus densiflora; PT, Pinus tabulaeformis; QA, Quercus acutissima; RP, Robinia pseudoacacia.

图4 泰山4个树种之间主要细菌优势类群相对丰度的差异(平均值±标准误差)。A, 优势纲。B, 优势门。PD, 赤松; PT, 油松; QA, 麻栎; RP, 刺槐。不同小写字母表示同一细菌类群不同树种的显著性差异, 相同字母表示无显著性差异。

Fig. 4 Differences in relative abundances of major bacterial dominant groups among the four species in Mount Taishan(mean ± SE). A, Dominant classes. B, Dominant phyla. PD, Pinus densiflora; PT, Pinus tabulaeformis; QA, Quercus acutissima; RP, Robinia pseudoacacia. Different lowercase letters indicate the significant differences in different species of the same bacterial group, while the same letter indicates no significant difference.

表4 细菌优势门相对丰度与细根分解速率、凋落物初始化学性质之间的相关分析

Table 4 Correlation analysis among the bacterial dominant phylum , the decomposition rate of fine roots , and the initial properties of litter

优势门 Dominant phylum	C (%)	N (%)	P (%)	木质素 Lignin (%)	C:N	N:P	分解速率 Decomposition rate
变形菌门 Proteobacteria	-0.64	0.57	0.77^*	-0.63	-0.69^*	0.52	0.71^*
放线菌门 Actinobacteria	0.61	-0.32	-0.69^*	0.48	0.50	-0.25	-0.62
拟杆菌门 Bacteroidetes	0.60	0.09	0.09	0.09	0.43	0.03	-0.36
酸杆菌门 Acidobacteria	-0.46	-0.48	-0.57	0.35	-0.16	-0.42	0.03
分解速率 Decomposition rate	-0.76^**	0.74^**	0.67^*	-0.90^**	-0.82^**	0.74^**	1.00

表5 细菌优势纲相对丰度与细根分解速率、凋落物初始化学性质之间的相关分析

Table 5 Correlation analysis among the decomposition rate of fine roots and bacterial dominant class and the initial properties of litter

优势纲 Dominant class	C (%)	N (%)	P (%)	木质素 Lignin (%)	C:N	N:P	分解速率 Decomposition rate
α-变形菌纲 Alphaproteobacteria	-0.33	0.79^**	0.56	-0.71^*	-0.73^*	0.84^**	0.63^*
β-变形菌纲 Betaproteobacteria	-0.42	-0.18	0.09	-0.00	-0.11	-0.21	0.19
γ-变形菌纲 Gammaproteobacteria	-0.08	0.49	0.47	-0.37	-0.25	0.43	0.24
不明放线菌纲unidentified-Actinobacteria	0.84^**	-0.25	-0.53	0.37	0.73^*	-0.25	-0.61
鞘脂杆菌纲 Sphingobacteriia	0.20	0.40	0.49	-0.23	-0.00	0.30	0.05

图5 细菌优势门与细根初始化学性质的冗余分析(RDA)。PD, 赤松; PT, 油松; QA, 麻栎; RP, 刺槐。

Fig. 5 Redundancy analysis (RDA) based on dominant bacterial phylum and the initial properties of fine root litter. PD, Pinus densiflora; PT, Pinus tabulaeformis; QA, Quercus acutissima; RP, Robinia pseudoacacia.

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泰山4种优势造林树种细根分解对细菌群落结构的影响

Effects of fine root decomposition on bacterial community structure of four dominated tree species in Mount Taishan, China

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