| 不同温度下的土壤微生物呼吸及其与水溶性有机碳和转化酶的关系 |
| 摘要点击 4625 全文点击 2304 投稿时间：2014-10-10 修订日期：2014-12-18 |
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| 中文关键词 温度 土壤微生物呼吸 温度敏感系数 水溶性有机碳 转化酶 |
| 英文关键词 temperature soil microbial respiration temperature sensitivity coefficient dissolved organic carbon invertase |
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| 中文摘要 |
| 为研究不同温度下的土壤微生物呼吸及其与水溶性有机碳(DOC)和转化酶的关系,设置了室内培养实验. 采集南京市周边老山、紫金山、宝华山的土壤,研究不同土壤的微生物呼吸对温度升高的响应规律,并分析土壤DOC含量及转化酶活性. 结果表明,不同土壤的累积微生物呼吸与土壤温度之间的关系均可用指数方程描述,其P值均达到极显著水平(P<0.001),不同地点土壤的微生物呼吸温度敏感系数(Q10值)在1.762~1.895之间变异. 累积土壤微生物呼吸的Q10值随着土壤温度升高表现出降低的趋势. 培养后27 d土壤微生物呼吸的Q10值与培养后1 d的Q10值无显著差异(P>0.05),这表明难分解有机质的温度敏感性与易分解有机质的温度敏感性一致. 对于所有土壤而言,累积土壤微生物呼吸与DOC含量之间存在极显著(P=0.003)的线性回归关系,DOC可以解释累积土壤微生物呼吸31.6%的变异性. 无论是单独分析不同土壤还是综合所有土壤的测定结果,累积微生物呼吸与土壤转化酶活性均存在极显著(P<0.01)的一元线性回归关系,由此说明转化酶活性是衡量土壤微生物呼吸大小的一个较好的指标. |
| 英文摘要 |
| In order to investigate the soil microbial respiration under different temperature conditions and its relationship to soil dissolved organic carbon (DOC) and invertase, an indoor incubation experiment was performed. The soil samples used for the experiment were taken from Laoshan, Zijinshan, and Baohuashan. The responses of soil microbial respiration to the increasing temperature were studied. The soil DOC content and invertase activity were also measured at the end of incubation. Results showed that relationships between cumulative microbial respiration of different soils and soil temperature could be explained by exponential functions, which had P values lower than 0.001. The coefficient of temperature sensitivity (Q10 value) varied from 1.762 to 1.895. The Q10 value of cumulative microbial respiration decreased with the increase of soil temperature for all soils. The Q10 value of microbial respiration on 27 days after incubation was close to that of 1 day after incubation, indicating that the temperature sensitivity of recalcitrant organic carbon may be similar to that of labile organic carbon. For all soils, a highly significant (P=0.003) linear relationship between cumulative soil microbial respiration and soil DOC content could be observed. Soil DOC content could explain 31.6% variances of cumulative soil microbial respiration. For the individual soil and all soils, the relationship between cumulative soil microbial respiration and invertase activity could be explained by a highly significant (P<0.01) linear regression function, which suggested that invertase was a good indicator of the magnitude of soil microbial respiration. |
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