Abstract：
Using a unique 8-year data set (2010-2017) of phloem data, we studied the effect of temperature and precipitation on the phloem anatomy (conduit area, widths of ring, early and late phloem) and xylem-ring width in two coexisting temperate tree species, Picea abies and Fagus sylvatica, from three contrasting European temperate forest sites. Histometric analyses were performed on microcores taken from tree stems in autumn. We found high interannual variability and sensitivity of phloem anatomy and xylem-ring widths to precipitation and temperature; however, the responses were species- and site-specific. The contrasting response of xylem and phloem-ring widths of the same tree species to weather conditions was found at the two Slovenian sites generally well supplied with precipitation, while at the driest Czech site, the influence of weather factors on xylem and phloem ring widths was synchronised. Since widths of mean annual xylem and phloem increments were narrowest at the Czech site, this site is suggested to be most restrictive for the radial growth of both species. By influencing the seasonal patterns of xylem and phloem development, water availability appears to be the most important determinant of tissue- and species-specific responses to local weather conditions.
摘要：
使用韧皮部数据的独特8年数据集(2010-2017年)，我们研究了温度和降水对韧皮部解剖结构的影响(管道面积，环的宽度，两种共存的温带树种的早期和晚期韧皮部）和木质部环宽度，云杉和芦笋，来自三个对比鲜明的欧洲温带森林遗址。对秋季从树茎中取出的微核进行了直方图分析。我们发现韧皮部解剖结构和木质部环宽度对降水和温度的高度年际变异性和敏感性；然而，响应是特定于物种和位点的。在斯洛文尼亚的两个站点上发现了相同树种的木质部和韧皮部环宽度对天气条件的对比响应，这些站点通常都有充足的降水，在捷克最干燥的地方，天气因素对木质部和韧皮部环宽度的影响是同步的。由于捷克地区的平均年木质部和韧皮部增量的宽度最窄，建议该站点对这两个物种的径向生长具有最大的限制性。通过影响木质部和韧皮部发育的季节规律,水的可用性似乎是组织和物种对当地天气条件的特定响应的最重要决定因素。
