Temperature Increases Soil Respiration Across Ecosystem Types and Soil Development, But Soil Properties Determine the Magnitude of This Effect
Temperature Increases Soil Respiration Across Ecosystem Types and Soil Development, But Soil Properties Determine the Magnitude of This Effect
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DOI：
10.1007/s10021-021-00648-2
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发表时间：
2021-05-07
期刊：
影响因子：
3.7
通讯作者：
Garcia-Palacios, Pablo
中科院分区：
文献类型：
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作者：
Dacal, Marina;Delgado-Baquerizo, Manuel;Garcia-Palacios, Pablo
由于全球变暖，通过土壤异养呼吸向大气中的土壤碳损失预计会增加，从而导致碳-气候的正反馈。尽管控制土壤呼吸的非生物和生物因素众所周知，但人们对土壤呼吸的强度如何响应土壤发育过程中以及不同土壤性质的温度变化的了解却少之又少。在这里，我们研究了土壤发育阶段和土壤性质在驱动土壤异养呼吸对温度的响应中的作用。我们在三种测定温度（5 摄氏度、15 摄氏度和 25 摄氏度）下培养了八个时间序列的土壤，土壤年龄从数百年到数百万年不等，涵盖广泛的植被类型、气候条件和时间序列起源。我们发现，在评估的八个时间序列中，测定温度对土壤呼吸速率具有一致的积极影响。然而，年代序列母质（沉积物/沙丘或火山）和土壤特性（pH、磷含量和微生物生物量）决定了这种温度影响的程度。最后，我们观察到土壤发育阶段对跨时间序列的土壤呼吸产生积极影响，但不会改变测定温度影响的大小。我们的工作表明，关键的土壤特性改变了温度对生态系统类型和土壤发育阶段的土壤呼吸的积极影响的程度。这些信息对于更好地了解碳-气候反馈的程度，从而制定准确的温室气体排放目标至关重要。
Soil carbon losses to the atmosphere, via soil heterotrophic respiration, are expected to increase in response to global warming, resulting in a positive carbon-climate feedback. Despite the well-known suite of abiotic and biotic factors controlling soil respiration, much less is known about how the magnitude of soil respiration responses to temperature changes over soil development and across contrasting soil properties. Here we investigated the role of soil development stage and soil properties in driving the responses of soil heterotrophic respiration to temperature. We incubated soils from eight chronosequences ranging in soil age from hundreds to million years, and encompassing a wide range of vegetation types, climatic conditions and chronosequences origins, at three assay temperatures (5 degrees C, 15 degrees C and 25 degrees C). We found a consistent positive effect of assay temperature on soil respiration rates across the eight chronosequences evaluated. However, chronosequences parent materials (sedimentary/sand dunes or volcanic) and soil properties (pH, phosphorus content and microbial biomass) determined the magnitude of this temperature effect. Finally, we observed a positive effect of soil development stage on soil respiration across chronosequences that did not alter the magnitude of assay temperature effects. Our work reveals that key soil properties alter the magnitude of the positive effect of temperature on soil respiration found across ecosystem types and soil development stages. This information is essential to better understand the magnitude of the carbon-climate feedback and thus to establish accurate greenhouse gas emission targets.