Effects of doubled concentration of CO2 on soil hydrolase activities related to turnover of soil C and N in a rice-cropping system
LI Yi-fei1,2, XIAO Mou-liang2, YUAN Hong-chao2, ZHU Zhen-ke2, WANG Jiu-rong2, LI Ke-lin1, GE Ti-da2, WU Jin-shui2
1. College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410128, China;
2. Key Laboratory of Subtropical Agriculture Ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
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).
李奕霏, 肖谋良, 袁红朝, 祝贞科, 王久荣, 李科林, 葛体达, 吴金水. CO2倍增对稻田土壤碳氮水解酶活性的影响[J]. 中国环境科学, 2018, 38(9): 3474-3480.
LI Yi-fei, XIAO Mou-liang, YUAN Hong-chao, ZHU Zhen-ke, WANG Jiu-rong, LI Ke-lin, GE Ti-da, WU Jin-shui. Effects of doubled concentration of CO2 on soil hydrolase activities related to turnover of soil C and N in a rice-cropping system. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3474-3480.
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