在旱地生态系统中,生物结皮改变了长期变暖对土壤呼吸的影响

IF 6.6 1区 农林科学 Q1 SOIL SCIENCE
Chao Guan , Changming Zhao , Marina Dacal , Beatriz Gozalo , Victoria Ochoa , Sergio Asensio , Mario Corrochano-Monsalve , Ning Chen , Lucio Biancari , Fernando T. Maestre
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引用次数: 0

摘要

预计气候变暖将对旱地生态系统的土壤呼吸产生截然不同的影响,在短期、中期和长期时间尺度上的响应从积极到消极不等。然而,在以生物壳为主的旱地生态系统中,气候变暖的长期(>;10年)影响及其潜在机制仍未得到充分研究。在这项研究中,我们研究了10-13年实验变暖对西班牙东南部干旱生态系统中具有不同生物覆盖的微点土壤呼吸的影响及其潜在的调节机制。研究了长期增温和生物结皮覆盖对表层(0 ~ 1 cm)土壤有机碳积累速率的影响。我们的研究结果表明,在低生物结皮覆盖的微站点上,由变暖引起的土壤呼吸的初始和中期减少是短暂的,呼吸速率最终恢复到控制水平。相反,在高生物结皮覆盖的微点上,变暖对土壤呼吸的抑制作用长期持续。在低生物结皮覆盖区,土壤呼吸动态主要受土壤有机碳储量和碳降解酶(β-葡萄糖苷酶和β- d纤维素生物苷酶)活性的影响。相反,在高生物覆盖的微站点,土壤呼吸的长期响应似乎与生物覆盖的变化而不是酶活性更密切相关。值得注意的是,长期增温和生物覆盖对有机碳积累速率均无显著影响。总的来说,我们的研究结果强调了长期实验研究对于捕获延迟或持续的生态系统响应以及减少全球变暖下土壤呼吸和碳-气候反馈预测的不确定性的价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Biocrusts alter the effects of long-term warming on soil respiration in a dryland ecosystem
Climate warming is expected to have contrasting impacts on soil respiration in dryland ecosystems, with responses ranging from positive to negative across short-, mid-, and long-term timescales. However, the long-term (>10 yr) effects of warming and their underlying mechanisms remain understudied in biocrust-dominated dryland ecosystems. In this study, we investigated the effects of 10–13 years of experimental warming on soil respiration and its underlying regulatory mechanisms at microsites with contrasting biocrust cover in a dryland ecosystem in southeastern Spain. We also examined how long-term warming and biocrust cover influenced the accumulation rate of soil organic carbon (SOC) in the surface layer (0–1 cm). Our results showed that initial and mid-term reductions in soil respiration induced by warming were transient at microsites with low biocrust cover, where respiration rates eventually returned to control levels. In contrast, the suppressive effect of warming on soil respiration persisted over the long term at microsites with high biocrust cover. At low biocrust cover microsites, soil respiration dynamics were primarily regulated by changes in SOC stocks and the activity of carbon-degrading enzymes such as β-glucosidase and β-D-cellobiosidase. Conversely, at high biocrust cover microsites, the long-term response of soil respiration appeared to be more closely associated with shifts in biocrust cover rather than enzymatic activity. Notably, SOC accumulation rates were not significantly affected by either long-term warming or biocrust cover. Overall, our findings underscore the value of long-term experimental studies for capturing delayed or persistent ecosystem responses and reducing uncertainties in projections of soil respiration and carbon–climate feedbacks under global warming.
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来源期刊
Geoderma
Geoderma 农林科学-土壤科学
CiteScore
11.80
自引率
6.60%
发文量
597
审稿时长
58 days
期刊介绍: Geoderma - the global journal of soil science - welcomes authors, readers and soil research from all parts of the world, encourages worldwide soil studies, and embraces all aspects of soil science and its associated pedagogy. The journal particularly welcomes interdisciplinary work focusing on dynamic soil processes and functions across space and time.
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