ABSTRACT

Climate seasonality is one of the important environmental variables that can drive changes in many properties of trees. However, how different tree species regulate their growth and development during changes of the growing period particularly at sapling stage is little known. This study, therefore, evaluated how morphological, anatomical, and soil properties differed in two growing season periods (March vs. September) between oak and black locust saplings across one growing season. Wood cell anatomical properties and soil characteristics were considerably influenced by seasonality. Each species showed greater wood cell anatomical characteristics in March than in September. Soil physical and chemical properties also showed great variance between March and September: soil pH, amount of Mg and Al concentrations in soil were higher in March while organic matter and total N concentration in soil showed greater values in September. Growth and development performance were also compared between two species. We found fibre cell characteristics, stem height, stem diameter and node number were to be greater in oak than in black locust for both early- and late growing periods. The results suggested that oak showed better adaptation to their local environments than black locust.

摘要

气候季节性是重要的环境变量之一，可以驱动树木的许多特性发生变化。然而，在生长期特别是幼苗期的变化过程中，不同树种如何调节其生长发育却鲜为人知。因此，本研究评估了橡树和刺槐树苗在一个生长季节的两个生长季节期间（3 月与 9 月）的形态学、解剖学和土壤特性的差异。木细胞解剖学特性和土壤特征受季节性影响很大。每个物种在 3 月份表现出比 9 月份更大的木细胞解剖特征。土壤理化性质在 3 月和 9 月之间也表现出很大的差异：土壤 pH、土壤中镁和铝的含量在 3 月份较高，而土壤中有机质和全氮含量在 9 月份较高。还比较了两个物种的生长和发育性能。我们发现橡树的纤维细胞特征、茎高、茎直径和节数在生长早期和晚期都比黑刺槐大。结果表明，与刺槐相比，橡树对当地环境的适应能力更强。