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Abstract：
Selecting the appropriate indicators and measuring time point numbers is important for accurately examining the shift in soil gross decomposition channel structure. Through a selected case study on a natural forest vs. rainfed arable system over a two-month-long experiment, the utility of three commonly employed indicators (fungi to bacteria ratio (F:B), fungivore to bacterivore ratio (FF:BF), and glucosamine to muramic acid ratio (GlcN:MurN)) were compared to reflect the shift in soil gross decomposition channel structure. The requirement of measuring the time point numbers for the three indicators was also assessed, and we suggest a potential methodology. Our results revealed that the GlcN:MurN ratio was more reliable for assessing the shifts in gross decomposition channel structure for long-term land use changes, while it was less sensitive to short-term drought compared with the other two indicators. The F:B ratio was more applicable than the FF:BF ratio for reflecting both long- and short-term changes. Furthermore, the reliability of the GlcN:MurN ratio was the least dependent on measuring time point numbers. We suggest the use of multiple indicators and the adoption of multiple measuring time points for the overall methodology.
摘要：
选择合适的指标并测量时间点数对于准确检查土壤总分解通道结构的变化很重要。通过对天然林与天然林的选定案例研究在为期两个月的实验中，雨养耕地系统，三种常用指标的效用(真菌与细菌之比(F：B)，真菌与细菌的比率（FF：BF），比较了葡萄糖胺与胞壁酸的比率（GlcN：MurN）），以反映土壤总分解通道结构的变化。还评估了测量三个指标的时间点数的要求,我们提出了一种潜在的方法。我们的结果表明，GlcN：MurN比率对于评估长期土地利用变化的总分解渠道结构变化更可靠，而与其他两个指标相比，它对短期干旱的敏感性较低。F：B比率比FF：BF比率更适用于反映长期和短期变化。此外，GlcN:MurN比值的可靠性对测量时间点数的依赖性最小.我们建议在总体方法中使用多个指标并采用多个测量时间点。
