生态环境学报 ›› 2022, Vol. 31 ›› Issue (10): 1971-1983.DOI: 10.16258/j.cnki.1674-5906.2022.10.005

• 研究论文 • 上一篇    下一篇

滇东南亚热带土壤细菌群落对植被垂直带变化的响应

李聪1,2(), 吕晶花1, 陆梅1,*(), 杨志东1, 刘攀1, 任玉连3, 杜凡4   

  1. 1.西南林业大学生态与环境学院,云南 昆明 650224
    2.中国林业科学研究院高原林业研究所,云南 昆明 650233
    3.贵州大学生命科学学院,贵州 贵阳 550025
    4.西南林业大学林学院,云南 昆明 650224
  • 收稿日期:2022-03-14 出版日期:2022-10-18 发布日期:2022-12-09
  • 通讯作者: *陆梅(1979年生),女,教授,从事土壤微生物生态、森林和湿地生态研究。E-mail: lumeizx@126.com
  • 作者简介:李聪(1997年生),男,博士研究生,从事土壤微生物、森林生态恢复研究。E-mail: licongswfu@126.com
  • 基金资助:
    国家自然科学基金地区科学基金项目(42067011);云南省应用基础研究面上项目(202001AT070113);云南省中青年学术技术带头人后备人才项目(202205AC160047);云南省应用基础研究面上项目(2013FB053);西南林业大学博士启动基金项目(111901);西畴县高等植物与植被类型多样性调查与评估(2166095);云南省高校优势特色重点学科(05000511311)

Responses of Soil Bacterial Communities to Vertical Vegetarian Zone Changes in the Subtropical Forests, Southeastern Yunnan

LI Cong1,2(), LÜ Jinghua1, LU Mei1,*(), YANG Zhidong1, LIU Pan1, REN Yulian3, DU Fan4   

  1. 1. College of Ecology and Soil and Environment, Southwest Forestry University, Kunming 650224, P. R. China
    2. Institute of Highland Forest Science, Chinese Academy of Forestry, Kunming 650223, P. R. China
    3. College of life sciences, Guizhou University, Guiyang 550025, P. R. China
    4. College of Forestry, Southwest Forestry University, Kunming 650224, P. R. China
  • Received:2022-03-14 Online:2022-10-18 Published:2022-12-09

摘要:

为探究南亚热带森林土壤细菌群落的变化特征及其与环境因子的耦合机制,沿海拔自下而上选取滇东南文山国家级自然保护区亚热带季风常绿阔叶林(E1)、半湿润常绿阔叶林(E2)、中山湿性常绿阔叶林(E3)3种典型森林类型为研究对象,采用Illumina高通量测序技术研究土壤细菌群落组成、结构和多样性对植被垂直带变化的响应规律,以及它们与环境因子之间的关系。研究发现,(1)环境因子沿植被垂直带变化显著(P<0.05)。E3植被带的凋落物厚度、Simpson指数、土壤含水量、有机质、氮、磷、钾含量较E1和E2显著增加,而植物的Margalef指数、Shannon指数、Pielou指数、土壤密度、pH、温度较E1和E2显著减少,其平均增幅和降幅分别3倍和1.5倍。(2)酸杆菌门、变形菌门、放线菌门等细菌优势菌群的相对丰度沿植被垂直带和土层变化差异显著(P<0.05);次优势菌门变形菌、放线菌在E3植被带的相对丰度显著高于E1和E2(P<0.05),而酸杆菌门相对丰度略低于其他两个植被带(P>0.05);变形菌与放线菌主要富集于土壤表层(0—10 cm)、酸杆菌富集在中层(10—30 cm)、绿弯菌富集在底层(40—50 cm)。(3)土壤细菌多样性沿植被垂直变化呈显著的增加趋势(P<0.05),并在E3达到最大值,沿土层则表现为减小变化。(4)随着海拔上升,植被多样性及凋落物厚度对细菌群落结构及多样性的主导因子从E1的3个减至E3的1个,而土壤理化对二者的解释率从E1的0个增至E3的7个,E1的植被多样性负向影响转变为E3含水量、碳氮等养分元素的正向影响。因此,文山自然保护区植被群落沿海拔的垂直变化,导致凋落物厚度、土壤水分、pH、养分含量的显著改变,进而决定了森林土壤细菌群落组成、结构及多样性的分布格局。

关键词: 垂直植被带, 细菌, 群落结构, 多样性, 环境因子, 文山自然保护区

Abstract:

This study aimed to explore the shift in soil bacterial communities and the coupling mechanism with the environmental factors in subtropical forests. We selected three typical forest types (i.e., monsoon evergreen broad-leaved forest (E1), sub-humid evergreen broad-leaved forest (E2) and middle-montane humid evergreen broad-leaved forest (E3)) along altitudes gradient in the Wenshan National Nature Reserve of Southeast Yunnan. The Illumina high-throughput sequencing technology was applied to identify responses of soil bacterial composition, structure and diversity to changes in vertical vegetation zones, as well as the effects of environmental factors on the soil bacteria. The results showed that (1) environmental factors changed significantly along the vegetation vertical zone (P<0.05). Compared with E1 and E2, the litter thickness, Simpson index, soil variables (i.e., moisture, organic matter, nitrogen, phosphorus and potassium concentrations) of E3 were significantly increased with an average of 3 times, while the indexes of Margalef, Shannon, Pielou, soil bulk density, pH and temperature were significantly decreased with an average 1.5 times, respectively. (2) The relative abundance of the dominant bacteria varied significantly along the vertical vegetarian zone and soil layers (P<0.05). The relative abundance of Proteobacteria and Actinobacteria of E3 were significantly higher than E1 and E2, while Acidobacteria of E3 was lower than others. The Proteobacteria and Actinobacteria had high abundances in the surface layer (0-10 cm), while Acidobacteria mainly assembled in the middle layer (10-30 cm); and Chloroflexi had a high abundance in the bottom layer (40-50 cm). (3) The soil bacterial diversity showed a significant increase along the vertical change of vegetation (P<0.05) reaching the maximum at E3, and decreased along the soil layer. (4) With the increase of altitudes, the dominant factors of vegetation diversity and litter thickness on bacterial community structure and diversity decreased from 3 (E1) to 1 (E3), while the dominant factors of physicochemical properties increased from 0 (E1) to 7 (E3), the negative impact of E1 with vegetation diversity shifted into the positive impact of E3 with soil moisture, carbon and nitrogen. Therefore, the vegetation communities changed along the vertical of altitudes, which lead to significant changes in litter thickness, soil moisture, pH, nutrient contents, and finally determined the composition, structure and diversity of bacterial communities.

Key words: vertical vegetarian zone, bacteria, communities, diversity, environmental factors, Wenshan Nature Reserve

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