应用生态学报2017，Vol.28Issue(4)：1069-1076,8.DOI:10.13287/j.1001-9332.201704.038
不同林龄杉木人工林的水分利用效率与叶片养分浓度
Variations of water use efficiency and foliar nutrient concentrations in Cunninghamia lanceolata plantations at different ages
摘要
Abstract
We studied water use efficiency (WUEi),nitrogen (N) and phosphorus (P) status of leaves at different leaf ages (current year,1-,2-,and 3-year-old foliage) as well as their relationships in a subtropical chronosequence of Chinese fir (Cunninghamia lanceolata) forests (3-,8-,14-,21-and 46-year-old).The results showed that foliar WUEi varied significantly with foliar age in the order of current year foliage ＞ 1-year-old foliage ＞ 2-year-old foliage ＞ 3-year-old foliage,while stand age had no significant impact on foliar WUEi.Foliar N/P ranged from 11.4 to 19.6 and was higher in younger and older stands than in stands at the fast-growing stage.The foliar N and P concentrations tended to display similar trends with foliar ages in the order of current year foliage＞ 1-year-old foliage＞2-year-old foliage＞3-year-old foliage.WUEi did not change significantly with stand ages,probably because the photosynthetic rates and stomatal conductance decreased simultaneously with stand age.There was no relationship between WUEi and foliar N.WUEihad significant positive correlation with foliar P and significant negative correlation with foliar N/P.It is indicated that foliar P concentration would be a key factor affecting WUEi with increasing atmospheric N deposition in subtropical forests.关键词
年龄序列/杉木/水分利用效率/养分状况Key words
chronosequence/Cunninghamia lanceolata/water use efficiency/nutrient status引用本文复制引用
孔令仑,黄志群,何宗明,郑璐嘉,刘桌明,王民煌..不同林龄杉木人工林的水分利用效率与叶片养分浓度[J].应用生态学报,2017,28(4):1069-1076,8.基金项目
本文由国家重大科学研究计划项目(2014CB954002)和国家自然科学基金项目(41371269,31570604)资助 This work was supported by the National Basic Research Program of China (2014CB954002),and the National Natural Science Foundation of China (41371269,31570604). （2014CB954002）
