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Species mixing effect on Norway spruce response to elevated CO2 and climatic variables: root and radial growth response
European Journal of Forest Research ( IF 2.6 ) Pub Date : 2021-07-22 , DOI: 10.1007/s10342-021-01405-9
Aysan Badraghi 1 , Michal V. Marek 1
Affiliation  

A 7-year study was conducted to examine the growth (diameter and root) response of Norway spruce (Picea abies (L.) Karst.) seedlings to elevated CO2 (CO2ELV, 770 μmol (CO2) mol−1) in different mixture types (monospecific (M): a Norway spruce seedling surrounded by six spruce seedlings, group-admixture (G): a spruce seedling surrounded by three spruce and three European beech seedlings, single-admixture (S): a spruce seedling surrounded by six beech seedlings). After seven years of treatments, no significant effect from elevated CO2 was found on the root dry mass (p = 0.90) and radial growth (p = 0.98) of Norway spruce. Neither did we find a significant interaction between [CO2] × mixing treatments (p = 0.56), i.e. there was not a significant effect of CO2 concentrations [CO2] in all the admixture types. On the contrary, spruce responses to admixture treatments were significant under CO2AMB (p = 0.05), which demonstrated that spruce mainly increased its growth (diameter and root) in M and neighbouring with beech was not favourable for spruce seedlings. In particular, spruce growth diminished when growing beside high proportions/numbers of European beech (S). Here, we also evaluated the association between tree-ring formation and climatic variables (precipitation and air temperature) in different admixture types under elevated and ambient CO2 (CO2AMB, 385 μmol (CO2) mol−1). Overall, our result suggests that spruce responses to climate factors can be affected by tree species mixing and CO2 concentrations, i.e. the interaction between climatic variables × admixture types × [CO2] could alter the response of spruce to climatic variables.



中文翻译:

物种混合对挪威云杉对二氧化碳升高和气候变量响应的影响:根和径向生长响应

进行了一项为期 7 年的研究,以检查挪威云杉 ( Picea abies (L.) Karst.) 幼苗对升高的 CO 2 (CO 2ELV , 770 μmol (CO 2 ) mol -1 )的生长(直径和根)响应不同的混合物类型(单种(M):挪威云杉幼苗被六棵云杉幼苗包围,组混合物(G):云杉幼苗被三棵云杉和三棵欧洲山毛榉幼苗包围,单一混合物(S):云杉幼苗被包围由六棵山毛榉幼苗)。经过 7 年的处理,未发现CO 2升高对根干质量 ( p  = 0.90) 和径向生长 ( p = 0.98) 的挪威云杉。我们也没有发现 [CO 2 ] × 混合处理之间的显着相互作用(p  = 0.56),即在所有混合物类型中 CO 2浓度 [CO 2 ]没有显着影响。相反,在 CO 2AMB ( p = 0.05),这表明云杉主要增加了其在 M 中的生长(直径和根),而与山毛榉相邻的则不利于云杉幼苗。特别是,当与高比例/数量的欧洲山毛榉 (S) 一起生长时,云杉的生长会减弱。在这里,我们还评估了在升高和环境 CO 2 (CO 2AMB , 385 μmol (CO 2 ) mol -1 )下不同混合物类型中树木年轮形成与气候变量(降水和气温)之间的关联。总体而言,我们的结果表明,云杉对气候因素的响应会受到树种混合和 CO 2浓度的影响,即气候变量之间的相互作用 × 混合物类型 × [CO 2] 可以改变云杉对气候变量的响应。

更新日期:2021-07-22
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