Ecology and Environment ›› 2024, Vol. 33 ›› Issue (10): 1544-1553.DOI: 10.16258/j.cnki.1674-5906.2024.10.006

• Research Article [Ecology] • Previous Articles     Next Articles

Analysis of Microbial Diversity of Rhizosphere Soil of Pinus wangii (Pinaceae) in In Situ and Ex Situ Conservation

ZHANG Chuanguang1,2,3(), SHEN Yan1,3, ZHANG Shanshan1,2, LI Yuwen4, CHEN Jian1,2, YANG Wenzhong1,2,*()   

  1. 1. Yunnan Academy of Forestry and Grassland, Kunming 650201, P. R. China
    2. Key Laboratory of Rare and Endangered Forest Plant, National Forestry and Grassland Administration, Kunming 650201, P. R. China
    3. Provincial field observation and research station for central Yunnan plateau forest ecosystem, Kunming 650201, P. R. China
    4. Wenshan Research Institute of Forestry and Grassland, Wenshan 663099, P. R. China
  • Received:2024-05-15 Online:2024-10-18 Published:2024-11-15
  • Contact: YANG Wenzhong

原生与迁地毛枝五针松根际土壤微生物多样性分析

张传光1,2,3(), 沈艳1,3, 张珊珊1,2, 李玉文4, 陈剑1,2, 杨文忠1,2,*()   

  1. 1.云南省林业和草原科学院,云南 昆明 650201
    2.云南珍稀濒特森林植物保护和繁育重点实验室,云南 昆明 650201
    3.滇中高原森林生态系统云南省野外科学观测研究站,云南 昆明 650201
    4.文山州林业和草原研究所,云南 文山 663099
  • 通讯作者: 杨文忠
  • 作者简介:张传光(1985年生),男,副研究员,主要从事土壤生态和生物多样性保护方面的研究。E-mail: zhangchuanguang@yafg.ac.cn
  • 基金资助:
    极小种群物种数据库建设(2023SJ09X-09);滇东南极小种群野生植物调查和种质资源收集(2022SJ07X-07)

Abstract:

Seedling survival rate is key to the ex situ conservation of Pinus wangii. To identify the factors resulting in the low survival rate of P. wangii in ex situ plots, general soil indicators were detected, and a high-flux sequencing platform was used to analyze the microbial diversity and community composition in the rhizosphere soil of P. wangii in in situ and ex situ conservation plots. The results showed that the indicators of rhizosphere soil nutrients in in situ plots were significantly higher than those in ex situ plots, except for total phosphorus (TP) and total potassium (TK). There were 46386 operational taxonomic units (OTUs) of bacteria comprising 26 phyla, 50 classes, 125 orders, 204 families, 316 genera, and 67999 OTUs of fungi comprising 11 phyla, 36 classes, 93 orders, 176 families, and 280 genera. The number of OTUs, either endemic bacteria or endemic fungi, in the ex situ plots was higher than that in the in situ plot. At the phylum level, Acidobacteriota, Proteobacteria, and Verrucomicrobiota in the bacterial community, and Basidiomycota, Ascomycota, and Rozellomycota in the fungal community were the dominant phyla in both the in situ and ex situ plots. At the genus level, unclassified Acidobacteriales, uncultured Acidobacteria, unclassified bacteria in the bacterial community, and unclassified fungi Elaphomyces and Clavulinopsis were the dominant genera in the fungal community. Through the analysis of species difference characteristics, the species composition of bacteria and fungi, as well as the diversity structure of the bacterial community, were found to be similar in the two in situ plots, but differed significantly from the ex situ plot. The diversity of the fungal community was not significantly different between the in situ and ex situ plots. Redundancy analysis revealed that general soil indicators affected microbial community structure to varying degrees. The composition of the dominant bacterial genera was mainly affected by pH and exchangeable Mg(EMg), whereas that of the dominant fungal genera was mostly affected by TP and EMg. In conclusion, microorganisms in the rhizosphere of P. wangii differed significantly between the in situ and ex situ plots. The soil properties, pH, TP, and EMg are likely key factors causing microbial differences and further resulting in a low survival rate of P. wangii in ex situ conservation. The results can provide basic data for the ex situ conservation of P. wangii.

Key words: Pinus wangii, different habitats, soil nutrients, microbial diversity, high-flux sequencing

摘要:

定植成活率是实施毛枝五针松迁地保护的关键。为探明毛枝五针松迁地定植成活率低的原因,通过测定土壤常规指标及采用高通量测序技术完成了原生地和迁地保护点毛枝五针松根际土壤微生物多样性及其群落组成的分析。结果表明,原生地根际土壤养分指标除全磷(TP)和全钾(TK)显著低于迁地点外,其余指标均显著高于迁地点。细菌46386个可操作分类单元OTUs涉及26门50纲125目204科316属,真菌67999个OTUs涉及11门36纲93目176科280属,且不论是特有细菌还是特有真菌,迁地点根际土壤中的OTU数目均高于原生地。门水平上,酸杆菌门、变形菌门和疣微菌门为优势细菌,担子菌门、子囊菌门和隐菌门为优势真菌;属水平上,未分类的酸杆菌属、未培养的酸杆菌属、未分类的细菌属为优势细菌,未分类的真菌属、粒状大团囊菌属和拟锁瑚菌属为优势真菌。通过物种差异特征分析发现2个原生地的细菌和真菌物种组成及细菌群落多样性结构相似,但与迁地点存在明显差异;原生地与迁地点根际土壤真菌群落多样性差异不显著。冗余分析表明,各理化因子不同程度地影响了原生地和迁地点根际土壤微生物的群落结构,pH和交换性镁(EMg)是影响优势细菌属组成的主要环境因子,TP和EMg是影响优势真菌属组成的主要环境因子。综上,毛枝五针松原生地和迁地点根际土壤微生物存在显著差异,pH、TP和EMg可能是造成这种差异并导致其迁地定植成活率低的关键因素,研究结果可为毛枝五针松迁地保护提供基础数据。

关键词: 毛枝五针松, 不同生境, 土壤养分, 微生物多样性, 高通量测序

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