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| Effects of Substrate Thickness on CO2 Emissions and Enzyme Activities of Substrates During Agaricus bisporus Cultivation |
| Received:June 02, 2015 |
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| KeyWord:Agaricus bisporus;substrate stacking thickness;enzyme activity;CO2 emission |
| Author Name | Affiliation | E-mail | | WANG Yi-xiang | Institute of Agricultural Ecology, Fujian Academy of Agricultural Sciences, Fujian Key Laboratory of Agro-ecological Processes in Red Soil Hilly Region, Fuzhou 350013, China | | | YE Jing | Institute of Agricultural Ecology, Fujian Academy of Agricultural Sciences, Fujian Key Laboratory of Agro-ecological Processes in Red Soil Hilly Region, Fuzhou 350013, China | | | XIAO Sheng-mei | Institute of Agricultural Ecology, Fujian Academy of Agricultural Sciences, Fujian Key Laboratory of Agro-ecological Processes in Red Soil Hilly Region, Fuzhou 350013, China | | | WENG Bo-qi | Institute of Agricultural Ecology, Fujian Academy of Agricultural Sciences, Fujian Key Laboratory of Agro-ecological Processes in Red Soil Hilly Region, Fuzhou 350013, China | wengboqi@163.com |
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| Abstract: |
| Substrate stacking thickness influences not only the yield of Agaricus bisporus, but also CO2 emissions, contributing to greenhouse gas emissions. Therefore, an experiment was conducted to examine the effects of different substrate stacking thicknesses on CO2 emissions and enzymatic activities of substrates during A. bisporus cultivation. There were four thickness treatments, including 10 cm(A), 15 cm(B), 20 cm(C) and 25 cm(D). The yield of A. bisporus increased, but the absolute biological efficiency decreased as the substrate thickness increased. During the whole period of A. bisporus growth, carboxymethyl cellulose, xylanase and amylase activities showed similar dynamics in different treatments:the first maximum value occurred at the late mycelial growth stage, and the second maximum value appeared at the fruit body formation stage. On the 15th day of the experiment, carboxymethyl cellulase and amylase activities were highest in the 20 cm treatment, being 135.7% and 25.0%, 104.6% and 19.4%, and 97.6% and 31.7% higher than those in the 10 cm, 15 cm and 25 cm thickness treatments, respectively. Significant differences in the enzyme activities were observed between 20 cm and the other three depth treatments. Carbon dioxide emissions showed similar diurnal dynamics in four treatments. The rates of CO2 emissions increased with increasing substrate thickness. The average CO2 emission rate in 25 cm thickness treatment was 19.3%, 18.7% and 11.4% greater than that in the 10 cm, 15 cm and 20 cm thickness treatments, respectively. |
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