Effects of FACE on denitrification activity in paddy-field soil
A free-air CO<sub>2</sub> enrichment (FACE) experiment was used to investigate the effects of elevated atmospheric CO<sub>2</sub> concentration on soil denitrification activities. The FACE system was conducted under a rice/wheat rotation at Jiangdu, China. The numbers of deni...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2007-05-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/1008-9209.2007.03.0284 |
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| Summary: | A free-air CO<sub>2</sub> enrichment (FACE) experiment was used to investigate the effects of elevated atmospheric CO<sub>2</sub> concentration on soil denitrification activities. The FACE system was conducted under a rice/wheat rotation at Jiangdu, China. The numbers of denitrifying bacteria, the activities of nitrate reductase and nitrite reductase was studied by sampling fresh soils from the fields with two different N fertilization levels (Usual N and Low N) and two rice straw incorporation levels [HR (half straw return) and NR (no straw return)] exposed to the elevated and ambient CO<sub>2</sub> during the rice-growing season in 2005. And the denitrification potential was determined at jointing stage. The results showed that elevated atmospheric CO<sub>2</sub> concentrations decreased denitrifying bacteria numbers, especially at UN and NR conditions (P<0.01). FACE had little impact on the activities of nitrate reductase and nitrite reductase. The study on DP (denitrification potential) showed that DP from FACE plots only arrived to 84.21% and 97.46% of ambients under LN and UN levels. The denitrification was restraind because of their competition between plant growing and microbial activity promoted by FACE. |
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| ISSN: | 1008-9209 2097-5155 |