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167 results on '"Duan, Pengpeng"'

31. Tree species diversity increases soil microbial carbon use efficiency in a subtropical forest.

Author

Duan, Pengpeng, Fu, Ruitong, Nottingham, Andrew T., Domeignoz‐Horta, Luiz A., Yang, Xinyi, Du, Hu, Wang, Kelin, and Li, Dejun

Subjects
*SOIL microbial ecology, *SPECIES diversity, *PLANT species diversity, *FOREST biodiversity, *CARBON in soils, *SOIL chemistry, *MICROBIAL growth
Abstract

Plant communities strongly influence soil microbial communities and, in turn, soil carbon (C) cycling. Microbial carbon use efficiency (CUE) is an important parameter for predicting soil C accumulation, yet how plant and soil microbial community traits influence microbial CUE remains poorly understood. Here, we determined how soil microbial CUE is influenced by plant and soil microbial community traits, by studying a natural gradient of plant species diversity in a subtropical forest. Our results showed that microbial CUE increased with increasing tree species diversity, suggesting a correlation between plant community traits and soil C storage. The specific soil properties that explained the greatest variation in microbial CUE were associated with microbial communities (biomass, enzyme activities and the ratio of oligotrophic to copiotrophic taxa); there were weaker correlations with plant‐input properties, soil chemistry and soil organic C quality and its mineral protection. Overall, high microbial CUE was associated with soil properties correlated with increased tree species diversity: higher substrate availability (simple SOM chemical structures and weak mineral organic associations) and high microbial growth rates despite increased community dominance by oligotrophic strategists. Our results point to a mechanism by which increased tree species diversity may increase the forest C sink by affecting carbon use with the soil microbial community. [ABSTRACT FROM AUTHOR]

Published
2023
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50. Preparation and electrochemical performances of hexacyanoferrate-doped poly(3,4-ethylenedioxythiophene) hydrogel

Author

Duan Pengpeng, Guo Yi, Mingxia Shen, Han Yongqin, MingLi Zhang, and Yuan Zongyang

Subjects
Supercapacitor, Materials science, Polymers and Plastics, Organic Chemistry, Electrochemistry, Capacitance, chemistry.chemical_compound, chemistry, Chemical engineering, PEDOT:PSS, Polymer chemistry, Materials Chemistry, Ferricyanide, In situ polymerization, Ferrocyanide, Poly(3,4-ethylenedioxythiophene)
Abstract

In this article, potassium hexacyanoferrate (K3Fe(CN)6) was introduced into poly(3,4-ethylenedioxythiophene) (PEDOT) hydrogel by in situ polymerization to prepare K3Fe(CN)6-doped PEDOT hydrogel. The specific capacitance of PEDOT hydrogel was efficiently increased by the doping effect of K3Fe(CN)6. The increase in capacitance achieved by introducing K3Fe(CN)6 into PEDOT hydrogel was attributed to the doping effect of anionic ferricyanide/ferrocyanide couple. The specific capacitance of PEDOT hydrogel increased from 38 F g−1 to the maximum value of 98 F g−1 (current density = 500 mA g−1) when the concentration of K3Fe(CN)6 reached 5 mM. On the basis of cycle life tests, the capacitance retention of about 75% for the doped PEDOT hydrogel after 5000 cycles suggested a high cycle stability of redox-active PEDOT hydrogel and its potential as an electrode material for supercapacitor applications.

Published
2014

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