Effects of Plant Fine Root Functional Traits and Soil Nutrients on the Diversity of Rhizosphere Microbial Communities in Tropical Cloud Forests in a Dry Season

Abstract

The composition and diversity of rhizosphere microbial communities may be due to root–soil–microbial interactions. The fine root functional traits and rhizosphere soil environmental factors of 13 representative plants in the Bawangling tropical cloud forest of Hainan Island were measured, to assess the key factors driving plant rhizosphere microbial communities. Illumina MiSeq sequencing technology was used to sequence the v3-V4 region of the 16SrDNA gene of 13 plant rhizosphere soil bacteria and the ITS1 region of the fungal ITSrDNA gene. Results showed that there were 355 families, 638 genera, and 719 species of rhizosphere soil bacteria as well as 29 families, 31 genera, and 31 species of rhizosphere soil fungi in the tropical cloud forests. The fine root traits, such as root phosphorus content, the specific root length and specific root area, were significantly negatively correlated with the Faith-pd indices of the bacterial community but were not correlated with the diversity of fungi communities. The soil pH was significantly and positively correlated with the Chao1 index, OTUs, Faith-pd and Simpson indices of the bacteria and fungi communities. The soil available phosphorus content was significantly and negatively correlated with the bacteria Simpson and the fungus Faith-pd indices. ABT analysis showed that soil pH and soil available phosphorus were the most important environmental conditions contributing to the rhizosphere bacterial and fungi communities, respectively. Our findings demonstrate that the soil environments had more influence on rhizosphere soil microbial diversity than the fine root functional traits.

Mycorrhizal Fungi Reclamation Promotes Stoichiometric Homeostasis of Re-Vegetation Types and Affects Soil Bacterial Function in Mining Subsidence of Northern Loess Plateau

“…Our results showed that the soil bacterial communities under all re-vegetation types mainly consisted of Proteobacteria, Acidobacteria, Actinobacteria and Choroflexi (Figure 3). Furthermore, Proteobacteria was the most abundant phylum in the soil, a result that is also in line with past studies [49,50]. However, there was no difference in the population of dominant microorganisms under different re-vegetation types and reclamation modes, but there was a significant difference in relative abundance, especially for FM and CK.…”

The structure and diversity of bacteria and fungi in the roots and rhizosphere soil of three different species of Geodorum

“…According to the results of intergroup differences and co-occurrence analysis, the proportions of OTU2385 (g_Delftia), OTU2756 (g_Bordetella) and OTU2755 (g_Pseudomonas) in the roots were significantly higher than those in the rhizosphere soil ( P ≤ 0.001), which may be related to soil properties, microbial relationships, microbial physiological adaptations, plant regulation, etc. [ 82 ].…”

Microbial Community and Their Potential Functions after Natural Vegetation Restoration in Gullies of Farmland in Mollisols of Northeast China

“…For the first path, SOM was negative to soil pH, and then positive to AP and further weakening the bacterial richness. This can attribute to the association between AP and bacterial richness being tight in soils with the limited P [57,58]. In the second path, SOM promoted the storage of water in soils, and then directly negatively associated with bacterial richness and further positively associated with bacterial diversity.…”