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应用生态学报 ›› 2017, Vol. 28 ›› Issue (1): 28-36.doi: 10.13287/j.1001-9332.201701.036

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不同林龄刺槐叶功能性状差异及其与土壤养分的关系

段媛媛1, 宋丽娟1, 牛素旗1, 黄婷1, 杨改河2, 郝文芳1*   

  1. 1西北农林科技大学生命科学学院, 陕西杨凌 712100
    2西北农林科技大学农学院, 陕西杨凌 712100
  • 收稿日期:2016-07-15 修回日期:2016-11-02 发布日期:2017-01-18
  • 通讯作者: *E-mail:haowenfang@nwsuaf.edu.cn
  • 作者简介:段媛媛,女,1991年生,硕士研究生.主要从事植被生态学研究.E-mail:duanyuanyuan2016@163.com
  • 基金资助:
    本文由国家林业部公益性行业科研专项(201304312)资助

Variation in leaf functional traits of different-aged Robinia pseudoacacia communities and relationships with soil nutrients

DUAN Yuan-yuan1, SONG Li-juan1, NIU Su-qi1, HUANG Ting1, YANG Gai-he2, HAO Wen-fang1*   

  1. 1College of Life Science, Northwest A&F University, Yangling 712100, Shaanxi, China
    2College of Agronomy, Northwest A&F University, Yangling 712100, Shaanxi, China
  • Received:2016-07-15 Revised:2016-11-02 Published:2017-01-18
  • Contact: *E-mail:haowenfang@nwsuaf.edu.cn
  • Supported by:
    This work was supported by the Special Fund for Forest-scientific Research in the Public Interest (201304312)

摘要: 对不同林龄刺槐群落叶功能性状差异及其与土壤养分的关系进行研究,分析刺槐对黄土丘陵区土壤环境的适应策略.结果表明: 随林龄的增大,刺槐比叶面积、叶面积、叶片含水量、叶全氮含量及叶有机碳含量呈先增大后减小的变化趋势,且在30年林龄时达到最大值,分别为279.18 cm2·g-1、12.33 cm2、0.09%、33.01 g·kg-1、523.08 g·kg-1.随林龄的增大,叶组织密度、叶全磷含量、叶厚度及气孔密度呈增大趋势,气孔长度及气孔宽度呈减小趋势.主成分分析表明,叶面积、比叶面积、叶全磷含量、叶片含水量、叶厚度及气孔密度均为刺槐叶功能性状随林龄变化的主要指标.各指标间呈一定的相关性,这表明刺槐能改变自身的形态结构,形成最佳功能组合以适应环境的变化.影响叶面积、叶片含水量、比叶面积及气孔长度的主要土壤因子是土壤全氮含量,影响气孔宽度、叶组织密度、叶厚度、叶全磷含量、叶全氮含量及气孔密度的主要土壤因子是土壤有机碳含量,这表明土壤全氮含量和有机碳含量是影响不同林龄刺槐叶功能性状的主要土壤因子.随林龄的增大,刺槐群落土壤养分得到改善,进而影响刺槐叶功能性状.不同林龄刺槐叶功能性状的差异反映出刺槐具有较强的叶片形态可塑性,有利于其适应黄土丘陵区的土壤环境.

Abstract: On the basis of various leaf functional traits of different-aged Robinia pseudoacacia communities, as well as the relationships between the traits and soil nutrients, the adaptation strategy of R. pseudoacacia in relation to soil conditions was analyzed in Ansai County, the Loess Plateau, China. The results showed that specific leaf area, leaf area, leaf water content, leaf total nitrogen content and leaf organic carbon content first increased and then decreased with the increasing stand age. The peak values of specific leaf area (279.18 cm2·g-1), leaf area (12.33 cm2), leaf water content (0.09%), leaf total nitrogen content (33.01 g·kg-1) and leaf organic carbon content (523.08 g·kg-1) were obtained at 30 years old. With the increasing stand age, leaf tissue density, leaf total phosphorus content, leaf thickness and stomata density increased, and stomata length and stomata width decreased. Leaf area, specific leaf area, leaf total phosphorus content, leaf water content, leaf thicknessand stomata density were the main indexes based on principal component analysis (PCA), for R. pseudoacacia leaf functional traits responding to the increased stand age. The indexes were correlated with each other, indicating that R. pseudoacacia was capable of changing leaf morphological structure to adapt to environmental changes. Soil total nitrogen content was the main factor influencing leaf area, leaf water content, specific leaf area and stomata length, while soil organic carbon content mainly affected stomata width, leaf tissue density, leaf thickness, leaf total phosphorus content, leaf total nitrogen content and stomata density. Therefore, soil total nitrogen and organic carbon content were main factors that affected leaf functional traits of R. pseu-doacacia in different stand ages. Soil nutrients in R. pseudoacacia communities were improved with the increasing stand age, which eventually affected leaf functional traits. The flexibility of leaf functional traits indicated that R. pseudoacacia communities had great potential to adapt to environmental change in Loess Plateau hilly region.