Li Xiao Ting, Chen Bin, Wang Hai Jun, Zheng Guang, Yang Dan, Miao Xin Yu, Xu Chi
School of Life Sciences, Nanjing University, Nanjing 210023, China.
College of Biology and Environment, Nanjing Forestry University, Nanjing 210037, China.
Ying Yong Sheng Tai Xue Bao. 2019 Jul;30(7):2284-2290. doi: 10.13287/j.1001-9332.201907.009.
To understand the effects of urban artificial nighttime light on the growth of evergreen trees, we conducted a field investigation in a typical urban street planted with Cinnamomum camphora (a common evergreen street tree species in eastern China) in the Nanjing City, China. Along the street, trees from two types of growing locations with contrasting distances from the street lamp (just under the lamp vs. between two adjacent lamps) were selected. The growth-related plant functional traits were measured and compared. The results showed that trees grown under the lamp had a mean diameter at beast height (DBH) of 16.8 cm, current-year branch productivity (CBP) of 309.4 g·m, current-year leaf productivity (CLP) of 241.5 g·m, and leaf relative chlorophyll content (LCC) of 34.6 SPAD. Trees grown between lamps had a mean DBH of 15.5 cm, CBP of 273.4 g·m, CLP of 212.8 g·m, and LCC of 33.1 SPAD. DBH, CBP, CLP and LCC of the trees under the lamp were significantly higher than those between lamps. There was no significant difference in specific leaf area between trees from the two locations. Our results suggested that urban artificial nighttime light could promote the growth of C. camphora, and alter sunlight-determined characteristics of canopy growth vigor.
为了解城市人工夜间光照对常绿树木生长的影响，我们在中国南京市一条种植有樟树（中国东部常见的常绿行道树种）的典型城市街道上进行了实地调查。沿着街道，从距离路灯远近不同的两种生长位置（正下方与两盏相邻路灯之间）选取树木。测量并比较了与生长相关的植物功能性状。结果表明，生长在路灯下的树木平均胸径（DBH）为16.8厘米，当年枝条生产力（CBP）为309.4克·米，当年叶片生产力（CLP）为241.5克·米，叶片相对叶绿素含量（LCC）为34.6 SPAD。生长在两盏路灯之间的树木平均胸径为15.5厘米，CBP为273.4克·米，CLP为212.8克·米，LCC为33.1 SPAD。路灯下树木的DBH、CBP、CLP和LCC显著高于两盏路灯之间的树木。两个位置的树木的比叶面积没有显著差异。我们的结果表明，城市人工夜间光照可促进樟树生长，并改变由阳光决定的树冠生长活力特征。
