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Influence of drought intensity on soil carbon priming and its temperature sensitivity after rewetting
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-11-07 , DOI: 10.1016/j.scitotenv.2023.168362 Rui Zhang 1 , Rong Li 1 , Jialiang Kuang 1 , Zhenqing Shi 1
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-11-07 , DOI: 10.1016/j.scitotenv.2023.168362 Rui Zhang 1 , Rong Li 1 , Jialiang Kuang 1 , Zhenqing Shi 1
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Global climate change can affect the soil thermal and moisture condition, potentially disrupting microbial-mediated soil respiration and altering the soil C cycle. However, the complex relationship between the soil C turnover and transient thermal and moisture conditions is not fully understood. Specifically, quantitative understanding is lacking regarding the impact of drought-rewetting events and temperature on the response of soil organic carbon (SOC) decomposition rate to exogenous C input, known as the priming effects (PEs). Herein, we quantified glucose-induced PEs during the rewetting of soils incubated under two drought intensities [with 20 % and 33 % water holding capacity (WHC)], at different incubation temperatures (15, 25, and 35 °C). Moreover, the effect size of drought intensities on PEs and the temperature sensitivity of PEs were quantified using ln (Response Ratio) and Q of PEs. Glucose input triggered positive PEs after 21 d incubation and increased SOC decomposition by 29.7–72.7 %. Drought intensity showed positive effect (ln > 0) on PEs at lower temperatures (15 and 25 °C) but showed negative effect (ln < 0) on PEs at higher temperature (35 °C). At moderate drought intensity (33 % WHC) before rewetting, PEs increased significantly with incubation temperature (Q = 1.65). Contrastingly, at high drought intensity (20 % WHC), temperature did not significantly influence PEs during the 21-d incubation after rewetting (Q = 0.96). The combination of drought, temperature change and glucose addition significantly changed the abundances in the dominant bacterial phyla (, , and ) and fungal phylum (), which likely affect PEs. Furthermore, the decrease in the demand for microbial-driven N mining, which is a crucial factor in promoting positive PEs, was associated with drought intensity at high temperature (35 °C). Our study provided a quantitative and mechanistic understanding of the impact of drought intensity on PEs before rewetting and its temperature sensitivity.
中文翻译：
干旱强度对土壤碳启动及其回湿后温度敏感性的影响
全球气候变化会影响土壤的温度和湿度状况，可能会破坏微生物介导的土壤呼吸并改变土壤碳循环。然而，土壤碳周转与瞬态热量和水分条件之间的复杂关系尚未完全了解。具体而言，关于干旱再湿事件和温度对土壤有机碳（SOC）分解速率对外源碳输入的响应（称为启动效应（PE））的影响缺乏定量了解。在此，我们量化了在两种干旱强度[分别为 20% 和 33% 持水能力 (WHC)]、不同培养温度（15、25 和 35 °C）下培养的土壤再润湿过程中葡萄糖诱导的 PE。此外，干旱强度对PE的影响大小和PE的温度敏感性使用PE的ln（响应比）和Q进行量化。孵育 21 天后，葡萄糖输入触发正 PE，并使 SOC 分解增加 29.7-72.7%。干旱强度在较低温度（15 和 25 °C）下对 PE 表现出积极影响（ln > 0），但在较高温度（35 °C）下对 PE 表现出消极影响（ln < 0）。在再润湿前的中等干旱强度 (33% WHC) 下，PE 随孵化温度的升高而显着增加 (Q = 1.65)。相比之下，在高干旱强度（20% WHC）下，在再润湿后的 21 天孵化期间，温度对 PE 没有显着影响（Q = 0.96）。干旱、温度变化和葡萄糖添加的结合显着改变了优势细菌门（、、和）和真菌门（）的丰度，这可能会影响 PE。此外，微生物驱动的氮开采需求的减少是促进正 PE 的关键因素，与高温（35°C）下的干旱强度有关。我们的研究提供了对再润湿前干旱强度对PE的影响及其温度敏感性的定量和机制理解。
更新日期：2023-11-07
中文翻译：
干旱强度对土壤碳启动及其回湿后温度敏感性的影响
全球气候变化会影响土壤的温度和湿度状况，可能会破坏微生物介导的土壤呼吸并改变土壤碳循环。然而，土壤碳周转与瞬态热量和水分条件之间的复杂关系尚未完全了解。具体而言，关于干旱再湿事件和温度对土壤有机碳（SOC）分解速率对外源碳输入的响应（称为启动效应（PE））的影响缺乏定量了解。在此，我们量化了在两种干旱强度[分别为 20% 和 33% 持水能力 (WHC)]、不同培养温度（15、25 和 35 °C）下培养的土壤再润湿过程中葡萄糖诱导的 PE。此外，干旱强度对PE的影响大小和PE的温度敏感性使用PE的ln（响应比）和Q进行量化。孵育 21 天后，葡萄糖输入触发正 PE，并使 SOC 分解增加 29.7-72.7%。干旱强度在较低温度（15 和 25 °C）下对 PE 表现出积极影响（ln > 0），但在较高温度（35 °C）下对 PE 表现出消极影响（ln < 0）。在再润湿前的中等干旱强度 (33% WHC) 下，PE 随孵化温度的升高而显着增加 (Q = 1.65)。相比之下，在高干旱强度（20% WHC）下，在再润湿后的 21 天孵化期间，温度对 PE 没有显着影响（Q = 0.96）。干旱、温度变化和葡萄糖添加的结合显着改变了优势细菌门（、、和）和真菌门（）的丰度，这可能会影响 PE。此外，微生物驱动的氮开采需求的减少是促进正 PE 的关键因素，与高温（35°C）下的干旱强度有关。我们的研究提供了对再润湿前干旱强度对PE的影响及其温度敏感性的定量和机制理解。
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