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Periphytic biofilms: A promising nutrient utilization regulator in wetlands

Author:
Yonghong Wu  Junzhuo Liu  Eldon R. Rene  


Journal:
Bioresource Technology


Issue Date:
2018


Abstract(summary):

Graphical abstract Highlights • Roles of periphytic biofilms in nutrient transformation in wetlands are summarized. • Periphytic biofilms can reduce NPS pollution by regulating N/P utilization. • Further work on N fixing and occluded P activating microorganisms is needed. Abstract Low nutrient utilization efficiency in agricultural ecosystems is the main cause of nonpoint source (NPS) pollution. Therefore, novel approaches should be explored to improve nutrient utilization in these ecosystems. Periphytic biofilms composed of microalgae, bacteria and other microbial organisms are ubiquitous and form a ‘third phase’ in artificial wetlands such as paddy fields. Periphytic biofilms play critical roles in nutrient transformation between the overlying water and soil/sediment, however, their contributions to nutrient utilization improvement and NPS pollution control have been largely underestimated. This mini review summarizes the contributions of periphytic biofilms to nutrient transformation processes, including assimilating and storing bioavailable nitrogen and phosphorus, fixing nitrogen, and activating occluded phosphorus. Future research should focus on augmenting the nitrogen fixing, phosphate solubilizing and phosphatase producing microorganisms in periphytic biofilms to improve nutrient utilization and thereby reduce NPS pollution production in artificial and natural wetland ecosystems.


Page:
44-44


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