Journal of Food, Agriculture and Environment
Variation characteristics and mechanisms of soil cellulase activity in Chinese for plantations at different developmental stages
Author(s):
Rui Zhang 1,
Jianmei Zou 1, Bing Wang 2, Wei Dai 1*, Tian Yang 1, Huan Pang 1Recieved Date: 2013-06-20, Accepted Date: 2013-09-28
Abstract:Young, middle-aged, mature and over-mature Chinese fir plantations in Dagang Mountain of Jiangxi Province were selected to study the variation characteristics of soil cellulase activity at varying developmental stages. Mechanisms of changes in cellulase absolute activities were further explored using the specific enzymatic activity concept and kinetic methods. Results showed that the absolute activity of soil cellulase decreased in young to middle-aged plantations, and then increased from middle-aged to over-mature plantations. Mechanisms of the changes in cellulase absolute activities in Chinese fir plantations varied at different developmental stages: From the young to middle-aged stage, a significant decrease in cellulase amount led to a sharp reduction of cellulase absolute activity, despite an increase in cellulase-substrate affinity. In the middle-aged to mature stage, cellulase amount was the most important affecting factor of absolute activity. In the over-mature stage, cellulase amount and cellulase–substrate affinity both promoted the highest levels of absolute activity. During the entire growth period in Chinese fir plantations, soil microorganisms were the main source of cellulase, and the microbial biomass determined cellulase amount. Soil clay content affected cellulase-substrate affinity by changing the existing state of cellulase in the soil.
Keywords:Cellulase,
absolute activity, specific enzymatic activity, enzyme kineticsJournal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2742-2746
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