茶包指数(TBI)对比较土壤分解速率有用吗?

IF 1.7 Q3 ECOLOGY Ecologies Pub Date : 2022-11-15 DOI:10.3390/ecologies3040038
Taiki Mori
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引用次数: 3

摘要

袋指数(TBI)是一种利用标准化材料(即商品茶包)通过确定两个指标来评估有机物分解的新方法:早期分解常数k(k_TBI)和枯枝落叶稳定因子S(S_TBI)。k_TBI被定义为描述rooibos茶分解曲线的渐近线模型的分解常数,而S是绿茶的稳定组分与总可水解组分的比率。然而,最近发现,k_TBI和S_TBI都偏离了通过将渐近线模型拟合到剩余绿茶和鲁伊博斯茶的时间序列质量(分别为k_tfitting和S_fitting)而精确确定的实际S和k值。然而,可以以成本和劳动力有效的方式确定的k_TBI和S_TBI,可能表明不同土壤中k_tfitting和S_fitting的相对值,并可用于比较分析。因此,本研究分别研究了k_TBI和S_TBI与k_fitting和S_fitting的正相关关系,在这种情况下,这些指标可用于比较分析。结果表明,k_TBI与k_拟合呈负相关。这项研究强调了获得时间序列数据的重要性,以准确确定描述rooibos茶分解曲线的渐近线模型的分解常数。S_TBI与S_fitting呈正相关,表明S_TBI可作为S的指标。
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Is the Tea Bag Index (TBI) Useful for Comparing Decomposition Rates among Soils?
The Bag Index (TBI) is a novel approach using standardized materials (i.e., commercial tea bags) to evaluate organic matter decomposition by determining two indexes: the early stage decomposition constant k (k_TBI) and litter stabilization factor S (S_TBI). k_TBI is defined as the decomposition constant of an asymptote model describing the decomposition curve of rooibos tea, whereas S is the ratio of the stabilized to total hydrolysable fractions of green tea. However, it was recently revealed that both k_TBI and S_TBI deviate from the actual S and k values accurately determined by fitting an asymptote model to the time series mass of green and rooibos teas remaining (k_fitting and S_fitting, respectively). Nevertheless, k_TBI and S_TBI, which can be determined in a cost- and labor-effective manner, might indicate the relative values of k_fitting and S_fitting across different soils and be useful for comparative analyses. Therefore, this study investigated the positive correlations of k_TBI and S_TBI with k_fitting and S_fitting, respectively, in which case these indexes are useful for comparative analyses. However, the result showed that k_TBI was negatively correlated with k_fitting. This study underscores the importance of obtaining time-series data for accurately determining the decomposition constant of an asymptote model describing the decomposition curve of rooibos tea. S_TBI was positively correlated with S_fitting, implying that S_TBI can be used as an indicator of S.
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