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首页> 外文期刊>Soil Biology & Biochemistry >Rhizospheric and heterotrophic respiration of a warm-temperate oak chronosequence in China
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Rhizospheric and heterotrophic respiration of a warm-temperate oak chronosequence in China

机译：中国暖温橡木时序序列的根际和异养呼吸

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Plot trenching and root decomposition experiments were conducted in a warm-temperate oak chronosequence (40-year-old, 48-year-old, 80-year-old, and 143-year-old) in China. We partitioned total soil surface CO sub(2) efflux (R sub(S)) into heterotrophic (R sub(H)) and rhizospheric (R sub(R)) components across the growing season of 2009. We found that the temporal variation of R sub(R) and R sub(H) can be well explained by soil temperature (T sub(5)) at 5 cm depth using exponential equations for all forests. However, R sub(R) of 40-year-old and 48-year-old forests peaked in September, while their T sub(5) peaks occurred in August. R sub(R) of 80-year-old and 143-year-old forests showed a similar pattern to T sub(5). The contribution of R sub(R) to R sub(S) (RC) of 40-year-old and 48-year-old forests presented a second peak in September. Seasonal variation of R sub(R) may be accounted for by the different successional stages. Cumulative R sub(H) and R sub(R) during the growing season varied with forest age. The estimated R sub(H) values for 40-year-old, 48-year-old, 80-year-old and 143-year-old forests averaged 431.72, 452.02, 484.62 and 678.93 g C m super(-2), respectively, while the corresponding values of R sub(R) averaged 191.94, 206.51, 321.13 and 153.03 g C m super(-2). The estimated RC increased from 30.78% in the 40-year-old forest to 39.85% in the 80-year-old forest and then declined to 18.39% in the 143-year-old forest. We found soil organic carbon (SOC), especially the light fraction organic carbon (LFOC), stock at 0-10 cm soil depth correlated well with R sub(H). There was no significant relationship between R sub(R) and fine root biomass regardless of stand age. Measured apparent temperature sensitivity (Q sub(10)) of R sub(H) (3.93 +/- 0.27) was significantly higher than that of R sub(R) (2.78 +/- 0.73). Capillary porosity decreased as stand age increased and it was negatively correlated to cumulative R sub(S). Our results emphasize the importance of partitioning soil respiration in evaluating the stand age effect on soil respiration and its significance to future model construction.
机译：在中国的暖温橡木年代序列中（40岁，48岁，80岁和143岁）进行了地沟和根分解实验。我们将2009年整个生长季节的土壤总表面CO sub（2）外排（R sub（S））分为异养（R sub（H））和根际（R sub（R））组分。我们发现时间变化通过使用所有森林的指数方程，可以通过5厘米深度处的土壤温度（T sub（5））很好地解释R sub（R）和R sub（H）的关系。然而，40岁和48岁的森林的R sub（R）在9月达到顶峰，而Tsub（5）的森林峰值在8月出现。 80年和143年的森林的R sub（R）与T sub（5）表现出相似的模式。 9月，具有40年和48年历史的森林的R sub（R）对R sub（S）（RC）的贡献出现了第二个高峰。 R sub（R）的季节性变化可以由不同的连续阶段来解释。生长季节的累积R sub（H）和R sub（R）随森林年龄而变化。 40岁，48岁，80岁和143岁森林的R sub（H）估计值平均分别为431.72、452.02、484.62和678.93 g C m super（-2）， R sub（R）的相应值平均分别为191.94、206.51、321.13和153.03 g C m super（-2）。估计的RC从40年历史的森林中的30.78％上升到80年历史的森林中的39.85％，然后下降到143年历史的森林中的18.39％。我们发现土壤深度为0-10 cm的土壤有机碳（SOC），尤其是轻质有机碳（LFOC）与R sub（H）密切相关。不论林分年龄，R sub（R）与细根生物量之间都没有显着关系。 R sub（H）的表观温度灵敏度（Q sub（10））（3.93 +/- 0.27）显着高于R sub（R）（2.78 +/- 0.73）。毛细孔孔隙度随着林龄的增加而降低，并且与累积R sub（S）负相关。我们的结果强调了分区土壤呼吸对评估林分年龄对土壤呼吸的影响的重要性及其对未来模型构建的意义。

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