Abstract
Under the circumstance of wetland degradation, we used Biolog EcoPlatesTM method to investigate the impact of ecological restoration on the function of topsoil microbial communities by monitoring their metabolic diversity around Chaohu lakeside wetland. Four restoration patterns were selected, including reed shoaly land (RL), poplar plantation land (PL), abandoned shoaly grassland (GL) and cultivated flower land (FL). The result showed a rapid growth trend at the initial stage of incubation, following the fastest change rate at 72 h in both dormant and growing seasons. The Average Well Color development (AWCD) values of RL pattern was the highest at the detection points of each culture time, while the GL were the lowest. The calculation of diversity indicators also displayed significant lower McIntosh index in dormant season and Shannon-Wiener index in growing season in GL than in the others (P < 0.05). Carbohydrates and carboxylic acids were found to be the main substrates used in dormant season, whereas amino acids, polymers and phenolic acids were increasingly utilized by the microbial communities in growing season. We observed soil total potassium as the key factor that significantly affected the utilization efficiency of different carbon sources in both seasons (P < 0.05).
Highlights
As one part of the terrestrial carbon pool, wetlands play a crucial role in global carbon cycling process [1]
There was no significant difference in the SWC of the surface soil in dormant season between GL, flower land (FL), reed shoaly land (RL) and plantation land (PL) patterns, while in growth season, the SWC of RL
This study showed that Chaohu lakeside wetland soils with different biogeochemical properties had microbial communities that exhibit distinct catabolic responses to a range of carbon-sources
Summary
As one part of the terrestrial carbon pool, wetlands play a crucial role in global carbon cycling process [1]. Soil is the main component of the wetland ecosystem, and it can be strongly impacted by the hydrological changes caused by alternation of wetting and drying, which alter the edaphic redox environment and control biogeochemical processes [2]. With the development of urbanization, wetland environment has been degraded resulted from agricultural reclamation, global climate change and acid precipitation [3,4,5], which makes wetland become one of the most threatened ecosystems in the world [6]. It was reported that exogenous heavy metal inputs from agricultural development are introduced into natural wetlands [8, 9], which may significantly affect carbon cycling and balance of the area
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