[1]李俊辉,李秧秧.立地条件和树龄对刺槐叶形态及生理特性的影响[J].水土保持研究,2012,19(04):176-181.
　LI Jun-hui,LI Yang-yang.Effects of Site and Tree Age on Leaf Morpho-physiological Traits of Black Locust[J].Research of Soil and Water Conservation,2012,19(04):176-181.
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立地条件和树龄对刺槐叶形态及生理特性的影响

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 19 期数: 2012年04期 页码: 176-181 栏目: 出版日期: 2012-08-20
Title:
Effects of Site and Tree Age on Leaf Morpho-physiological Traits of Black Locust
作者:
李俊辉1,3, 李秧秧1,2
1. 中国科学院 水利部 水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨凌 712100;
2. 西北农林科技大学 水土保持研究所, 陕西 杨凌 712100;
3. 中国科学院 研究生院, 北京 100049
Author(s):
LI Jun-hui1,3, LI Yang-yang1,2
1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China;
3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
关键词:
立地条件; 树龄; 刺槐; 叶形态与生理特性
Keywords:
site; tree age; Robinia pseudoacacia; leaf morph-physiological traits
分类号:
Q945.79
摘要:
立地条件和树龄是影响黄土高原刺槐“小老树”形成的主要因素。为此，该文研究了不同立地条件下（水分条件好的沟谷台地和水分条件相对差的峁坡坡地）刺槐叶形态和生理特性随树龄的变化，目的在于揭示“小老树”形成的生理机制。结果表明：坡地刺槐具有小的叶面积，高的比叶质量和叶厚度，低的比叶水力导度、净光合速率和气孔导度，而水分利用效率和N、P养分含量均较高。随树龄增加，刺槐的叶形态和生理特性表现出干旱生境中的特点，叶水分关系的恶化和分配到光合器官中的N含量比例的减少是随树龄增加净光合速率降低的重要原因。立地条件和树龄对大多数叶形态和生理特性表现出显著的交互作用，表明干旱与树龄增加相互作用导致的光合面积的减少、叶片结构和建造成本的上升及净光合速率的下降是黄土高原“小老树”形成的重要原因。
Abstract:
Site and tree age are the major factors resulting in the development of small dwarf tree on the Loess Plateau. Thus, this paper studied changes of leaf morpho-physiological traits of black lotcust (Robinia pseudoacacia) with dynamic of tree age under two sites (gully tableland with sufficient water supply and inter-gully slopeland with limited water supply) in order to examine the physiological mechanism of formation of small dwarf tree. The results indicated that black locust growing on the slopeland had smaller leaf area, higher specific leaf mass and leaf thickness, lower whole-tree hydraulic conductance, decreased net photosynthetic rate and stomatal conductance,increased water use efficiency and N, P nutrient content. Changes of leaf morpho-physiological traits of black lotcust with tree age showed the same trend as in drought habitat. Worse leaf water status and decreased proportion of N in photosynthetic organ contributed to the decrease of photosynthetic rate in old-aged trees. Site and tree age showed significant interaction for most leaf traits, indicating decreased photosynthetic area, raised leaf construction cost and lower net photosynthetic rate were major reasons responsible for forming small dwarf tree on the Loess Plateau.

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备注/Memo

收稿日期:2012-3-28;修回日期:2012-4-15
基金项目:国家自然科学基金项目（3107054）；国家林业局公益行业科研专项（200904056）
作者简介:李俊辉（1987- ），男，山西沁源人，在读硕士，主要从事植物水分生理生态方面研究。E-mail：lijh1987@163.com。
通讯作者:李秧秧（1968- ），女，陕西咸阳人，博士，研究员，主要从事植物水分与养分生理生态方面的研究工作。E-mail：yyli@ms.iswc.ac.cn。

更新日期/Last Update: 1900-01-01