旱季补水对桉树幼龄林叶片非结构性碳水化合物的影响  

Effects of dry season irrigation on leaf unstructured carbohydrates in Eucalyptus young forest

作　　者：余斐 张水云 华雷 刘文泉 邱权 何茜 苏艳 刘效东 李吉跃 YU Fei;TRUONG THUY VAN;HUA Lei;LIU Wenquan;QIU Quan;HE Qian;SU Yan;LIU Xiaodong;LI Jiyue(College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,Guangdong,China;Provincial Key Laboratory of Silviculture,Protection and Utilization,Guangdong Academy of Forestry,Guangzhou 510520,Guangdong,China;Hue University of Agriculture and Forestry,Hue City 49116,Vietnam)

机构地区：[1]华南农业大学林学与风景园林学院,广东广州510642 [2]广东省林业科学研究院广东省森林培育与保护利用重点实验室,广东广州510520 [3]顺化农林大学,越南顺化49116

出　　处：《中南林业科技大学学报》2021年第5期42-48,共7页Journal of Central South University of Forestry & Technology

基　　金：国家重点研发计划项目(2016YFD0600201,2016YFD060020102);国家自然科学基金项目(31800527)。

摘　　要：【目的】叶片非结构性碳水化合物含量能体现植物在当前生长阶段对环境的适应性。华南地区的季节性干旱严重限制人工林的生长,开展旱季补水和常规施肥处理,研究尾巨桉人工林叶片非结构性碳水化合物含量变化,对于桉树人工林质量精准化提升的研究具有重要意义,并且提供了数据支持,具有很强的实用性。【方法】通过对尾巨桉Eucalyptus uorphylla×E.grandis无性系DH32-29幼龄林进行旱季补水和常规施肥的添加试验,探究旱季补水和常规施肥措施对叶片非结构性碳水化合物含量的影响。同时,利用当地的气候条件,研究叶片非结构性碳水化合物含量在雨季和旱季的差异。【结果】1)叶片可溶性糖含量的季度变化存在波动性,而叶片淀粉含量随时间变化逐渐下降。总体而言,叶片非结构性碳水化合物含量随着尾巨桉的生长时间呈现波动下降趋势。2)在旱季,常规施肥处理F(无水有肥处理)和WF(有水有肥处理)的叶片可溶性糖含量显著高于无施肥处理CK(无水无肥处理)和W(有水无肥处理)。3)叶片可溶性糖含量、淀粉含量和非结构性碳水化合物含量在雨季和旱季之间不存在显著性差异。4)最影响叶片可溶性糖含量的为施肥措施,而最影响叶片淀粉含量和非结构性碳水化合物含量的为生长时间段。【结论】施肥能显著提高叶片可溶性糖含量,从而能更好地维持叶片生理活动,更有利于树木的碳源输出;而旱季补水能有效地缓解尾巨桉受到的季节性干旱胁迫,从而使得叶片中的可溶性糖含量以及淀粉含量均较低,能有效将光合产物转移到其他器官组织。【Objective】Leaf non-structural carbohydrate concentration(NSC)can reflect the adaptability of plants to the environment at the current growth stage.The seasonal drought in South China severely restricts the growth of plantation forests,carrying out dry season irrigation and regular fertilization treatments to study the NSC changes of Eucalyptus leaves,which is of great significance for the study of the precise improvement of the quality of Eucalyptus plantation forests,and provides data support.【Method】Dry season irrigation and regular fertilization were carried out to study the effects of these treatments on the leaf NSC of Eucalyptus uorphylla×E.grandis(Clone DH32-29)young forest.At the same time,using local climatic conditions to study the difference of leaf NSC in the rainy and dry seasons.【Result】1)The seasonal variation of the leaf soluble sugar concentration(TSS)fluctuated,while the leaf starch concentration(Starch)gradually decreased with time.In general,the concentration of non-structural carbohydrates in leaves showed a fluctuating downward trend with the growth time of E.uorphylla×E.grandis.2)In the dry season,the leaf TSS of regular fertilization(F and WF)was significantly higher than that of non-fertilization(CK and W).3)There is no significant difference between the leaf TSS,Starch and NSC between the rainy season and the dry season. 4) The most affected leaf TSS is the fertilization measure, while the most affectedleaf Starch and NSC are the growth period.【Conclusion】As a whole, fertilization could significantly increase the soluble sugarconcentration of leaves, which could better maintain the physiological activities of the leaves, and was more conducive to the carbonsource output of the trees;while dry season irrigation could effectively alleviate the seasonal drought stress on E. uorphylla×E. grandis,thereby making the leaves the concentration of soluble sugar and starch were both low, which could effectively transfer photosyntheticproducts to other organs and tissues.

关 键 词：尾巨桉人工林 旱季补水 可溶性糖浓度 非结构性碳水化合物浓度 淀粉浓度 

分 类 号：S718.43[农业科学—林学]