Gao Xiaohui, Zhao Binqing, Chen Zecheng, Song Wenqi, Li Zongshan, Wang Xiaochun
Aulin College, Northeast Forestry University, Harbin 150040, China.
Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education, School of Forestry, Northeast Forestry University, Harbin 150040, China.
Biology (Basel). 2023 Oct 27;12(11):1373. doi: 10.3390/biology12111373.
In the context of the intensification of global urbanization, how urbanization (urban heat island effect and air pollution) affects urban tree growth is not fully understood. In this paper, the radial growth and xylem anatomical characteristics of three different tree species (, and var. ) in urban and rural areas of Harbin were compared by means of tree-ring anatomy. The results showed that there were significant differences in the growth of both broadleaf trees and conifers between urban and rural areas. The vessel number, cumulative area of vessels, and theoretical hydraulic conductivity of all tree species in rural areas were higher than those in urban areas, indicating that urbanization may have the effect of slowing down growth. However, broadleaf trees in urban areas had higher vessel density and a greater percentage of a conductive area within xylem and theoretical xylem-specific hydraulic conductivity. The thickness of cell walls and cell wall reinforcement index of var. were strongly reduced by air pollution, implying that it may be more sensitive to urbanization. Compared to , showed less sensitivity to urbanization. Warming and drying climate in Harbin may be an important factor affecting tree growth.
在全球城市化加剧的背景下，城市化（城市热岛效应和空气污染）如何影响城市树木生长尚未得到充分理解。本文通过树木年轮解剖学方法，比较了哈尔滨市城乡地区三种不同树种（、和变种）的径向生长和木质部解剖特征。结果表明，城乡地区阔叶树和针叶树的生长均存在显著差异。农村地区所有树种的导管数量、导管累积面积和理论水力传导率均高于城市地区，表明城市化可能具有减缓生长的作用。然而，城市地区的阔叶树具有更高的导管密度、木质部内传导面积的更大百分比以及理论木质部比水力传导率。变种的细胞壁厚度和细胞壁强化指数因空气污染而大幅降低，这意味着它可能对城市化更为敏感。与相比，对城市化的敏感性较低。哈尔滨气候变暖和干燥可能是影响树木生长的重要因素。
