CO<sub>2</sub>倍增对稻田土壤碳氮水解酶活性的影响

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Abstract

To reveal effects of the elevated CO₂ concentration on soil microbial biomass and enzyme activity, typical paddy soil was selected from a subtropical area with a long history of rice cultivation. We studied the contents of soil microbial biomass carbon and nitrogen, and enzymes activity related to soil organic matter degradation (including β-glucoside, xylanase and chitinase) under different rice growth period. The results showed that:the plant biomass and soil microbial biomass were increased by the elevated CO₂ concentration (800×10^-6) comparing to the normal CO₂(400×10^-6). The soil microbial biomass carbon and nitrogen contents were significantly affected by rice growth stages (P<0.05), which reached to the peak at the rice booting stage. The enzyme activities of β-glucoside, xylanase and chitinase were increased by the elevated CO₂ concentration (800×10^-6) comparing to the normal CO₂(400×10^-6). All the enzyme activities measured in this study increased in the rice booting stage, and then decreased in the mature stage. The enzyme activity followed the sequence as β-Glu > Xyl > N-Ac under the same sampling time and CO₂ concentration. The multivariate analysis of variance showed that the CO₂ concentration and rice growth period significantly influenced the rice plant biomass, soil microbial biomass carbon and nitrogen and the enzyme activity measured in this study. Moreover, the interaction of the CO₂ concentration and rice growth period had a significant effect on soil microbial biomass carbon and enzyme activity. Furthermore, the correlation analysis showed that there was a significant positive correlation between soil microbial biomass carbon and soil β-glucosidase, chitinase and xylanase activities. In conclusions, the elevated CO₂ can promote the rice growth, soil microbial biomass and soil enzyme activity. Especially, soil microbial biomass has close relationship with soil enzyme activity. These changes were varying with the rice growth, and all of them reached to the maximum at the rice most productive period (booting stage).

Key words： paddy soil doubled CO₂ concentration rice growth period soil microorganism extracellular enzyme activity

Received: 15 March 2017

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	Articles by authors
	LI Yi-fei
	XIAO Mou-liang
	YUAN Hong-chao
	ZHU Zhen-ke
	WANG Jiu-rong
	LI Ke-lin
	GE Ti-da
	WU Jin-shui

Cite this article:

LI Yi-fei,XIAO Mou-liang,YUAN Hong-chao等. Effects of doubled concentration of CO₂ on soil hydrolase activities related to turnover of soil C and N in a rice-cropping system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3474-3480.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I9/3474

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