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首页> 外文期刊>Plant and Soil >Estimation of autotrophic and heterotrophic components of soil respiration by trenching is sensitive to corrections for root decomposition and changes in soil water content
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Estimation of autotrophic and heterotrophic components of soil respiration by trenching is sensitive to corrections for root decomposition and changes in soil water content

机译：通过挖沟估算土壤呼吸的自养和异养成分对根分解和土壤水分变化的校正很敏感。

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摘要

This study aims to assess the effects of corrections for disturbances such as an increased amount of dead roots and an increase in volumetric soil water content on the calculation of soil CO sub(2) efflux partitioning. Soil CO sub(2) efflux, soil temperature and superficial soil water content were monitored in two young beech sites (H1 and H2) during a trenching experiment. Trenching induced a significant input of dead root mass that participated in soil CO sub(2) efflux and reduced the soil dissolved organic carbon content, while it increased superficial soil water content within the trenched plot. Annual soil CO sub(2) efflux in control plots was 528 g C m super(-2) year super(-1) at H1 and 527 g C m super(-2) year super(-1) at H2. The annual soil CO sub(2) efflux in trenched plots was 353 g C m super(-2) year super(-1) at H1 and 425 g C m super(-2) year super(-1) at H2. By taking into account annual CO sub(2) efflux from decaying trenched roots, the autotrophic contribution to total soil CO sub(2) efflux reached 69% at H1 and 54% at H2. The partitioning calculation was highly sensitive to the initial root mass estimated within the trenched plots. Uncertainties in the remaining root mass, the fraction of root C that is incorporated into soil organic matter during root decomposition, and the root decomposition rate constant had a limited impact on the partitioning calculation. Corrections for differences in superficial soil water content had a significant impact on annual respired CO sub(2) despite a limited effect on partitioning.
机译：这项研究旨在评估对诸如土壤死根增加和土壤水体积体积增加等干扰的校正对土壤CO sub（2）外排分配计算的影响。在挖沟试验期间，在两个年轻的山毛榉站点（H1和H2）中监测土壤CO sub（2）的流出，土壤温度和表层土壤水分。沟引起大量死根团块输入，这些死根团块参与土壤CO sub（2）外排并降低了土壤溶解的有机碳含量，同时增加了沟渠内表层土壤的水分含量。对照样区的年土壤CO sub（2）外流在H1为528 g C m super（-2）年super（-1），在H2为527 g C m super（-2）年super（-1）。沟渠样地的年土壤CO sub（2）外排量在H1为353 g C m super（-2）年super（-1），在H2为425 g C m super（-2）年super（-1）。考虑到每年腐烂的沟状根的CO sub（2）流出，自养对土壤CO sub（2）总流出的贡献在H1达到69％，在H2达到54％。分区计算对沟槽图中估计的初始根质量非常敏感。剩余根质量，根分解过程中掺入土壤有机质中的根C含量以及根分解速率常数的不确定性对分区计算的影响有限。尽管对分区的影响有限，但对表层土壤含水量差异的校正对年度呼吸CO sub（2）产生了重大影响。

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