适度变暖下干旱灌木丛生态系统碳吸收的增强：氮驱动的植物形态变化的作用,Global Change Biology

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适度变暖下干旱灌木丛生态系统碳吸收的增强：氮驱动的植物形态变化的作用
Global Change Biology ( IF 10.8 ) Pub Date : 2021-08-06 , DOI: 10.1111/gcb.15823
Dario Liberati ₁ , Gabriele Guidolotti ₁ , Giovanbattista de Dato ₁ , Paolo De Angelis ₁

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净生态系统CO ₂交换是植物光合作用净碳吸收和土壤和植物呼吸作用碳损失的结果。气候变化导致的温度升高可以改变这些通量之间的平衡，并触发可以加速气候变暖的生态系统-气候反馈。由于这些动态在干燥灌木丛中尚未得到很好的研究，我们对地中海灌木丛进行了为期 10 年的夜间温度操纵实验，该实验分析了与优势灌木物种相关的生态系统碳通量，以及与叶片光合作用、叶形态和冠层结构。在适度的夜间变暖（+0.9°C 最低日温度，土壤水分没有显着降低）下，Cistus monspeliensis形成了具有更多叶子的枝条，这些叶子相对更大，树冠更密集，支持更高的植物水平光合作用速率。鉴于生态系统呼吸不受影响，树冠形态的这种变化导致净生态系统交换显着增强（中午 + 47%）。观察到的枝条和冠层形态的变化归因于变暖植物的营养状态改善，主要是由于氮循环的变化和衰老叶片中更高的氮吸收效率。我们的研究结果表明，适度变暖引发的植物形态改变影响了生态系统 CO ₂ 通量，这为实验性变暖下干燥灌木丛生态系统中白天碳吸收增加提供了第一个证据。

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Enhancement of ecosystem carbon uptake in a dry shrubland under moderate warming: The role of nitrogen-driven changes in plant morphology

Net ecosystem CO₂ exchange is the result of net carbon uptake by plant photosynthesis and carbon loss by soil and plant respiration. Temperature increases due to climate change can modify the equilibrium between these fluxes and trigger ecosystem-climate feedbacks that can accelerate climate warming. As these dynamics have not been well studied in dry shrublands, we subjected a Mediterranean shrubland to a 10-year night-time temperature manipulation experiment that analyzed ecosystem carbon fluxes associated with dominant shrub species, together with several plant parameters related to leaf photosynthesis, leaf morphology, and canopy structure. Under moderate night-time warming (+0.9°C minimum daily temperature, no significant reduction in soil moisture), Cistus monspeliensis formed shoots with more leaves that were relatively larger and denser canopies that supported higher plant-level photosynthesis rates. Given that ecosystem respiration was not affected, this change in canopy morphology led to a significant enhancement in net ecosystem exchange (+47% at midday). The observed changes in shoot and canopy morphology were attributed to the improved nutritional state of the warmed plants, primarily due to changes in nitrogen cycling and higher nitrogen resorption efficiency in senescent leaves. Our results show that modifications in plant morphology triggered by moderate warming affected ecosystem CO₂ fluxes, providing the first evidence for enhanced daytime carbon uptake in a dry shrubland ecosystem under experimental warming.

更新日期：2021-10-06

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