| UV-B辐射增强与秸秆施用对大豆田土壤呼吸的影响 |
| 摘要点击 1928 全文点击 957 投稿时间：2009-08-27 修订日期：2009-12-26 |
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| 中文关键词 UV-B辐射增强 秸秆施用 大豆 土壤呼吸 碳转化率 温度敏感性 |
| 英文关键词 enhanced UV-B radiation straw application soybean soil respiration carbon conversion rate temperature sensitivity |
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| 中文摘要 |
| 利用LI-8100开路式土壤碳通量测量系统测定土壤呼吸,研究了UV-B辐射增强和秸秆施用对大豆田土壤呼吸的影响. 结果表明， UV-B辐射增强20%使土壤呼吸速率降低了30.31%,秸秆施用使土壤呼吸速率提高了14.51%,UV-B辐射增强+秸秆施用复合处理对土壤呼吸速率没有显著影响. UV-B增强提高了施用秸秆的碳转化率.对照、UV-B增强、秸秆施用和UV-B增强+秸秆施用4种处理的土壤呼吸与土壤温度都存在极其显著的指数关系(P<0.01),拟合方程的决定系数R2分别为0.434、 0.563、 0.451和0.513.土壤呼吸温度敏感系数Q10值分别为1.55、 1.91、 1.80和1.71.可见,UV-B辐射增强、秸秆施用和UV-B辐射增强+秸秆施用提高了大豆田土壤呼吸的Q10. |
| 英文摘要 |
| Field experiment was carried out in 2008 in order to investigate the effects of enhanced UV-B radiation and straw application on soil respiration in soybean field. LI-8100 automated soil CO2 flux system was used to measure soil respiration under 20% enhanced UV-B radiation, straw application, 20% enhanced UV-B radiation + straw application and control. Environmental factors such as air temperature, soil temperature and moisture were also measured. Results indicated that supplemental UV-B radiation reduced soil respiration rate by 30.31%, straw application increased soil respiration rate by 14.51%, while enhanced UV-B radiation + straw application combined treatment had no significant effect on soil respiration. Enhanced UV-B radiation enhanced the carbon conversion rate of straw. Significant relationship were found between soil respiration rate and soil temperature under the control, enhanced UV-B, straw application, and enhanced UV-B + straw application, the fitting equation determined coefficients R2 were 0.434, 0.563,0.451 and 0.513. The Q10(temperature sensitivity coefficients) for soil respiration were 1.55, 1.91, 1.80 and 1.71, respectively. It was reflected that enhanced UV-B radiation, straw application and enhanced UV-B radiation + straw returning increased the Q10 for soil respiration. |
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