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应用生态学报 ›› 2017, Vol. 28 ›› Issue (4): 1069-1076.doi: 10.13287/j.1001-9332.201704.038

• 目次 • 上一篇    下一篇

不同林龄杉木人工林的水分利用效率与叶片养分浓度

孔令仑1,2, 黄志群1,2*, 何宗明3, 郑璐嘉1,2, 刘桌明3, 王民煌1,2   

  1. 1福建师范大学地理科学学院, 福州 350007
    2湿润亚热带山地生态国家重点实验室培育基地, 福州 350007
    3福建农林大学林学院, 福州 350002
  • 收稿日期:2016-09-26 出版日期:2017-04-18 发布日期:2017-04-18
  • 通讯作者: * E-mail: zhiqunhuang@hotmail.com
  • 作者简介:孔令仑,女,1992年生,硕士研究生.主要从事森林生态研究.E-mail:1134987743@qq.com
  • 基金资助:
    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

Variations of water use efficiency and foliar nutrient concentrations in Cunninghamia lanceolata plantations at different ages

KONG Ling-lun1,2, HUANG Zhi-qun1,2*, HE Zong-ming3, ZHENG Lu-jia1,2, LIU Zhuo-ming3, WANG Min-huang1,2   

  1. 1College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China
    2Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China
    3 College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
  • Received:2016-09-26 Online:2017-04-18 Published:2017-04-18
  • Contact: * E-mail: zhiqunhuang@hotmail.com
  • Supported by:
    This work was supported by the National Basic Research Program of China (2014CB954002), and the National Natural Science Foundation of China (41371269, 31570604)

摘要: 以亚热带不同林龄(3、8、14、21、46年生)杉木人工林为研究对象,探索不同叶龄(当年生、1年生、2年生和3年生)叶片氮、磷养分状况和水分利用效率的差异及其相互关系.结果表明: 不同叶龄水分利用效率差异显著,总体趋势为当年生>1年生>2年生>3年生,而林龄对水分利用效率影响不显著.叶片N/P为11.4~19.6,其中,幼龄林和老龄林叶片N/P高于速生期林分叶片N/P,氮、磷浓度随叶龄的变化趋势一致,为当年生>1年生>2年生>3年生.水分利用效率随林龄变化不显著,可能是因为叶片光合速率和气孔导度同时随林龄下降.水分利用效率与叶片氮浓度相关不显著,而与叶片磷浓度呈显著正相关,与N/P呈显著负相关,表明在氮沉降增加的背景下,亚热带森林中植物磷含量逐渐成为影响水分利用效率的重要因子.

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. WUEi had 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.