Influence of mangrove roots on microbial abundance and ecoenzyme activity in sediments of a subtropical coastal mangrove ecosystem

TY - JOUR

T1 - Influence of mangrove roots on microbial abundance and ecoenzyme activity in sediments of a subtropical coastal mangrove ecosystem

AU - Luo, Ling

AU - Wu, Ruonan

AU - Gu, Ji Dong

AU - Zhang, Jing

AU - Deng, Shihuai

AU - Zhang, Yanzong

AU - Wang, Lilin

AU - He, Yan

N1 - Publisher Copyright: © 2018 Elsevier Ltd

PY - 2018/8

Y1 - 2018/8

N2 - Although the rhizosphere effect has been widely studied, the relevant information about how mangrove roots affect microbial and enzymatic activity was still lacking due to the particularity of mangroves and intertidal zone. In order to understand the effects of mangrove roots on microbial growth and the indicators of nutrient cycling, microbial abundance as well as extracellular enzyme activities were investigated in both rhizosphere and non-rhizosphere sediments of a coastal mangrove wetland ecosystem. Comparing to non-rhizosphere sediments, bacterial abundance was slightly lower, but fungal abundance was notably higher in the rhizosphere sediments. Moreover, β-glucosidase (GLU), N-acetyl-glucosaminidase (NAG) and acid phosphatase (ACP) activities were enhanced clearly, whereas phenol oxidase (PHO) activity was significantly reduced in the rhizosphere sediments. Interestingly, it was found that soluble phenolics were closely related to fungal abundance and PHO activity (p < 0.05). Both fungal abundance and PHO activity were also significantly correlated with each other (p < 0.05). Therefore, the strong correlation between fungal abundance and both phenolics and PHO activity might partially suggest that fungi might contribute to the reduction of soluble phenolics.

AB - Although the rhizosphere effect has been widely studied, the relevant information about how mangrove roots affect microbial and enzymatic activity was still lacking due to the particularity of mangroves and intertidal zone. In order to understand the effects of mangrove roots on microbial growth and the indicators of nutrient cycling, microbial abundance as well as extracellular enzyme activities were investigated in both rhizosphere and non-rhizosphere sediments of a coastal mangrove wetland ecosystem. Comparing to non-rhizosphere sediments, bacterial abundance was slightly lower, but fungal abundance was notably higher in the rhizosphere sediments. Moreover, β-glucosidase (GLU), N-acetyl-glucosaminidase (NAG) and acid phosphatase (ACP) activities were enhanced clearly, whereas phenol oxidase (PHO) activity was significantly reduced in the rhizosphere sediments. Interestingly, it was found that soluble phenolics were closely related to fungal abundance and PHO activity (p < 0.05). Both fungal abundance and PHO activity were also significantly correlated with each other (p < 0.05). Therefore, the strong correlation between fungal abundance and both phenolics and PHO activity might partially suggest that fungi might contribute to the reduction of soluble phenolics.

KW - Enzymatic stoichiometry

KW - Hydrolase

KW - Phenol oxidase

KW - Rhizosphere

KW - Soluble phenolics

UR - http://www.scopus.com/inward/record.url?scp=85047091853&partnerID=8YFLogxK

U2 - 10.1016/j.ibiod.2018.05.002

DO - 10.1016/j.ibiod.2018.05.002

M3 - 文章

AN - SCOPUS:85047091853

SN - 0964-8305

VL - 132

SP - 10

EP - 17

JO - International Biodeterioration and Biodegradation

JF - International Biodeterioration and Biodegradation

ER -