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Snow dynamics influence tree growth by controlling soil temperature in mountain pine forests
Agricultural and Forest Meteorology ( IF 5.6 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.agrformet.2020.108205
Alba Sanmiguel-Vallelado , J. Julio Camarero , Enrique Morán-Tejeda , Antonio Gazol , Michele Colangelo , Esteban Alonso-González , Juan Ignacio López-Moreno

Abstract Snow dynamics are key to understanding tree growth in mountain forests and future response to climate change. However, precise monitoring of microclimate conditions and variables related to tree growth and functioning are lacking. To advance on those issues, snow cover and microclimate conditions, tree phenology, xylogenesis, intra-annual radial growth and the concentration of sapwood and needle non-structural carbohydrates were intensively monitored in four Pinus uncinata forests along an altitudinal gradient over three years in a Pyrenean valley (NE Spain). Snow dynamics exerted strong influence on soil temperature and moisture, particularly before and during the early growing season. Soil temperature was the most relevant microclimate variable during the overall xylogenesis, mainly influencing the production of mature tracheids. Large snow accumulation resulted in later snow depletion and a consequent delay in soil warming onset. Low soil temperatures in the spring, related to prolonged snow persistence, retarded cambial reactivation and led to lower growth rate. Despite strong spatial variability among plots, wood production was determined by snow dynamics in three out of the four studied plots. This study highlights the major role played by early and late growing season soil temperatures on radial growth of mountain conifers. The results of this study suggest that a future shallower and more transitory snowpack in the studied forests, together with warmer soil and air temperatures, may increase radial growth and productivity of similar mid-latitude, young mountain forests.

中文翻译:

雪动态通过控制山松林土壤温度影响树木生长

摘要 雪动态是了解山地森林树木生长和未来应对气候变化的关键。然而,缺乏对与树木生长和功能相关的小气候条件和变量的精确监测。为了在这些问题上取得进展,三年内在沿海拔梯度的四片油松林中,对积雪和小气候条件、树木物候、木发生、年内径向生长以及边材和针叶非结构碳水化合物的浓度进行了集中监测。比利牛斯山谷(西班牙东北部)。降雪动态对土壤温度和湿度有很大影响,特别是在生长季节之前和期间。土壤温度是整个木糖生成过程中最相关的小气候变量,主要影响成熟管胞的产生。大量积雪导致后来的雪枯竭,并因此延迟了土壤变暖的开始。春季土壤温度低,与长期积雪有关,延缓了形成层的重新激活并导致生长速度降低。尽管地块之间存在强烈的空间变异性,但在四个研究地块中的三个地块中,木材产量是由雪动态决定的。这项研究强调了早期和晚期生长季节土壤温度对山地针叶树径向生长的主要作用。这项研究的结果表明,未来研究森林中更浅、更短暂的积雪,加上温暖的土壤和气温,可能会增加类似的中纬度山地年轻森林的径向生长和生产力。春季土壤温度低,与长期积雪有关,延缓了形成层的重新激活并导致生长速度降低。尽管地块之间存在强烈的空间变异性,但在四个研究地块中的三个地块中,木材产量是由雪动态决定的。这项研究强调了早期和晚期生长季节土壤温度对山地针叶树径向生长的主要作用。这项研究的结果表明,未来研究森林中更浅、更短暂的积雪,加上温暖的土壤和气温,可能会增加类似的中纬度山地年轻森林的径向生长和生产力。春季土壤温度低,与长期积雪有关,延缓了形成层的重新激活并导致生长速度降低。尽管地块之间存在强烈的空间变异性,但在四个研究地块中的三个地块中,木材产量是由雪动态决定的。这项研究强调了早期和晚期生长季节土壤温度对山地针叶树径向生长的主要作用。这项研究的结果表明,未来研究森林中更浅、更短暂的积雪,加上温暖的土壤和气温,可能会增加类似的中纬度山地年轻森林的径向生长和生产力。在四个研究地块中的三个地块中,木材产量由雪动态决定。这项研究强调了早期和晚期生长季节土壤温度对山地针叶树径向生长的主要作用。这项研究的结果表明,未来研究森林中更浅、更短暂的积雪,加上温暖的土壤和气温,可能会增加类似的中纬度山地年轻森林的径向生长和生产力。在四个研究地块中的三个地块中,木材产量由雪动态决定。这项研究强调了早期和晚期生长季节土壤温度对山地针叶树径向生长的主要作用。这项研究的结果表明,未来研究森林中更浅、更短暂的积雪,加上温暖的土壤和气温,可能会增加类似的中纬度山地年轻森林的径向生长和生产力。
更新日期:2021-01-01
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