DOI: 10.1007/s10533-013-9893-6
Scopus记录号: 2-s2.0-84891901751
论文题名: Physiological shifts in the microbial community drive changes in enzyme activity in a perennial agroecosystem
作者: Hargreaves S.K. ; Hofmockel K.S.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 117, 期: 1 起始页码: 67
结束页码: 79
语种: 英语
英文关键词: Bioenergy cropping systems
; Coupled carbon-nitrogen cycling
; Enzymes
; Landscape Biomass Project
; Microbial biomass
; Microbial physiology
Scopus关键词: agricultural ecosystem
; bioenergy
; biogeochemistry
; biomass
; biomineralization
; decomposition
; enzyme activity
; grass
; growth rate
; maize
; microbial activity
; microbial community
; nutrient availability
; physiology
; resource allocation
; Panicum virgatum
; Zea mays
英文摘要: Perennial agroecosystems have the potential to promote plant-microbial linkages by increasing the quantity of root carbon entering the soil. However, an understanding of how perennial cropping systems affect microbial communities remains incomplete. The objective of this study was to determine the potential for a fertilized perennial bioenergy cropping system to impact microbial growth and enzyme activity. Three times throughout the growing season we examined the activity of four enzymes involved in decomposition (ß-glucosidase, ß-xylosidase, cellobiohydrolase, and N-acetyl glucosaminidase) in replicated plots of an annual (corn) and perennial-based (switchgrass) cropping system. We also took simultaneous measurements of microbial biomass and potential rates of microbial respiration and net N mineralization. Microbial biomass was unaffected by cropping system. Mid-summer, however, we observed increases in enzyme activity and potential microbial respiration in the perennial system that were independent of microbial biomass, likely in response to labile carbon inputs. Further, we observed lower net N mineralization, higher microbial biomass nitrogen and higher activity of nitrogen liberating enzymes, which are indicative of a community with high nitrogen demands. Overall, our research demonstrates that perennial agroecosystems can affect the physiological capacity of the microbial community, yielding communities with greater nitrogen retention and greater rates of decomposition as a result of allocation of resources towards enzyme production and nitrogen mining. These results can inform biogeochemical models with respect to the importance of temporally dynamic changes in carbon and nitrogen availability and microbial carbon use efficiency as drivers of enzyme production. © 2013 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83691
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA, 50011, United States
Recommended Citation:
Hargreaves S.K.,Hofmockel K.S.. Physiological shifts in the microbial community drive changes in enzyme activity in a perennial agroecosystem[J]. Biogeochemistry,2014-01-01,117(1)