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长期变暖和干燥的土壤限制了碳吸收和生长,尽管树和树的生长季节较长

Margaux Didion-Gency¹, Yann Vitasse², Nina Buchmann³

¹Plant Ecology Research Laboratory PERL, School of Architecture, Civil and Environmental Engineering, EPFL, CH-1015 Lausanne, Switzerland.

Plant physiology

|October 24, 2023

概括

气候变化影响森林碳平衡. 这项研究表明,变暖会影响树木的表观,而干旱会影响树木的生长. 树木混合物可以减轻气候变化对森林的负面影响.

科学领域:

森林生态与气候变化
植物生理学和碳循环

背景情况:

温暖和干燥的气候显著影响树木表态和碳循环,影响森林碳平衡.
了解气候变暖和土壤干燥的不同和综合影响,以及物种相互作用如何影响树木的反应,至关重要.

研究的目的:

评估空气变暖和降低土壤水分对欧洲树和树的多年影响,单独和联合.
研究物种相互作用 (单一种植与混合种植) 如何调节这些气候变化对树木表态,光合作用,碳水化合物储存和生长的影响.

主要方法:

利用中宇宙来模拟连续多年的空气变暖和较低的土壤湿度条件.
评估了欧洲 (Fagus sylvatica L.) 和树 (Quercus pubescens Willd.) 的现象学,叶子层次的光合作用,非结构性碳水化合物度和地表生长. ) 的情况.
对比单种植和混合种植中的树木反应,以了解物种相互作用效应.

主要成果:

变暖延长了两种物种的生长季节,但减少了树的生长;较低的土壤湿度减少了两种物种的碳同化和生长.
综合变暖和干燥的土壤并没有产生与其个体影响不同的影响.
与单一种植相比,树种混合物在更温暖,更干燥的条件下提高了树和树的性能.

结论:

较高的温度主要影响树木的现象学,而较低的土壤湿度主要影响叶子水平的同化和生长.
特别是混合物中的物种相互作用可以弥补慢性热量和干旱对树木表现的负面影响.
考虑到物种相互作用的森林管理策略可能对提高森林对气候变化的适应性至关重要.

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