| .夜间增温对麦田土壤呼吸速率的影响[J].农业环境科学学报,2013,32(7):. |
| 夜间增温对麦田土壤呼吸速率的影响 |
| Effect of Nighttime Warming on Soil Respiration in Winter Wheat Soil |
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| DOI：10.11654/jaes.2013.07.016 |
| 中文关键词: 夜间增温 根际呼吸速率 土壤基础呼吸速率 |
| 英文关键词: nighttime warming rhizopheric respiration soil basal respiration |
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| 摘要点击次数: 1893 |
| 全文下载次数: 1713 |
| 中文摘要: |
| 全球气候变暖呈现明显的非对称性，夜间气温和冬、春季的增温趋势显著，采用田间开放式被动增温系统研究夜间增温对南京地区麦田土壤呼吸速率不同组分（根际呼吸速率和土壤基础呼吸速率）的影响机制。结果显示，夜间增温处理下麦田土壤总呼吸速率、根际呼吸速率的季节平均值分别为4.32、3.29 μmol·m-2·s-1，比对照小区分别增加了10.0%、15.4%，表明夜间增温显著促进了土壤总呼吸强度和根际呼吸。从不同生育期来看，增温处理下孕穗期（4月8日至4月18日）的根际呼吸速率增加了34.6%~44.2%，而生长后期（5月9日至5月17日）则降低了31.4%~40.4%。相反，夜间增温抑制了孕穗期的基础呼吸速率，而在一定程度上促进了冬小麦生长后期的基础呼吸速率。研究表明，夜间增温对麦田土壤根际呼吸速率具有促进作用，而在一定程度上对土壤基础呼吸速率具有抑制效应，可能是通过改变作物生物量、养分吸收等特性，从而影响到作物根系与土壤微生物之间的养分竞争所致。 |
| 英文摘要: |
| Climate warming presents significantly asymmetric trends with greatly seasonal and diurnal differences, greater temperature elevations existing in the winter-spring season than in the summer-autumn season and at the nighttime than at the daytime. We performed field warming experiment under the technique of passive nighttime warming to investigate the impacts of night warming on rhizospheric respiration and soil basal respiration during winter wheat growing stages. A LI-8100 carbon flux system was used to measure seasonal variation in soil respiration components during key growing stages. The results showed that seasonal averaged values of total soil respiration and rhizospheric respiration under nighttime warming condition were 4.32 μmol·m-2·s-1 and 3.29 μmol·m-2·s-1, and were 10.0% and 15.4% higher than the control treatments, respectively. This indicated that nighttime warming significantly increased total soil respiration and rhizospheric respiration in winter wheat soil. When taking the different growing stages into account, warming increased rhizospheric respiration during booting stages by 34.6%~44.2%, whereas decreased it during late growing stage by 31.4%~40.4%。In contrast, nighttime warming decreased soil basal respiration during booting stages and to some extent promoted it during late growing stages. It could be concluded that nighttime warming stimulated rhizospheric respiration and to some extent inhibited soil basal respiration, which resulted from nutrient competition between crop roots and soil microorganism as a result of the increase of plant biomass and nutrient uptake of wheat under warming. |
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