Long-term climate reconstructions are frequently based on tree-ring high-resolution proxies extracted from subfossil peatland trees. Peatlands are peculiar ecosystems characterized by high moisture in the upper soil part which creates a harsh living environment for trees. The climate mostly indirectly influences tree growth determining seasonal variations in the water table level. Within this framework, the aim of this study was to investigate climate responses of trees (Pinus sylvestris L.) growing inside and outside a Southern Alpine peat bog, by using tree-ring and wood anatomical traits (e.g. tracheid number and dimension, cell-wall thickness). Our results showed differences in the xylem structure and climate signal recorded by peatland and mineral soil trees. Peatland trees were characterized by narrow rings and tracheids with thinner cell wall. Summer temperature and precipitation were the major drivers of xylem formation in peatland trees. At intra-annual level wood anatomical traits revealed a complex within-ring signal during the growing season. The multi-parameters approach together with the high-resolution gained by using tree-ring sectors allowed us to obtain new detailed information on the xylem development of peatland trees and climate drivers that influenced it.

长期的气候重建通常基于从化石化泥炭地树中提取的年轮高分辨率代理。泥炭地是独特的生态系统，其特征是上部土壤湿度高，为树木创造了恶劣的生活环境。气候主要间接影响树木的生长，从而决定地下水位的季节性变化。在此框架内，本研究的目的是通过利用树木的年轮和木材的解剖特征（例如，气管数量和尺寸，细胞结构）来研究在南部高山泥炭沼泽内部和外部生长的树木（Pinus sylvestris L.）的气候响应。室壁厚度）。我们的结果表明泥炭地和矿物土壤树木记录的木质部结构和气候信号存在差异。泥炭地树的特征是狭窄的环和气管，细胞壁较薄。夏季温度和降水是泥炭地木质部木质部形成的主要驱动力。在年内水平上，在生长季节，木材解剖学特征显示出复杂的环内信号。多参数方法以及通过使用树环扇区获得的高分辨率使我们能够获得有关泥炭地树木木质部发育和影响其的气候驱动因素的新的详细信息。