不同石灰岩生境淡竹非结构性碳水化合物浓度及分配特征

doi:10.11707/j.1001-7488.20190603

摘要/Abstract

摘要： [目的]探讨石灰岩山地优势种淡竹非结构性碳水化合物（NSC）浓度、分配特征及其生态意义。[方法]对赣西北石灰岩山地3种不同土壤含水率生境（连续土、半连续土和零星土）的淡竹进行取样调查，比较分析不同生境淡竹个体（全株）和构件水平（叶、枝、秆、蔸、鞭、根）的非结构性碳水化合物浓度和分配特征。[结果]1）在个体水平，从连续土、半连续土到零星土，随着土壤含水率下降，淡竹可溶性糖浓度逐渐增加，零星土生境值（3.32%±0.20%）显著高于连续土生境值（2.52%±0.17%）（P < 0.05），NSC和淀粉浓度先降后升，半连续土生境值均显著低于零星土生境值（P < 0.05）；2）在构件水平，3种土壤生境淡竹叶的NSC、可溶性糖和淀粉浓度高，枝和根次之，秆、蔸和鞭相对较低；3）随着土壤含水率降低，淡竹根中可溶性糖浓度升高，增加幅度大于其他构件，半连续土和零星土生境增幅分别为74.29%和39.35%；叶、根等生理活性高的构件可溶性糖分配比例增加，相比连续土生境，在零星土生境叶、根分别增加71.26%、50.61%，而秆、蔸、鞭等贮存的构件分配比例均减少。[结论]淡竹通过调节个体和构件非结构性碳水化合物浓度和分配来适应干旱胁迫，构件水平的NSC调节行为比个体水平能更深入反映植物应对干旱胁迫的生理策略。

关键词: 淡竹, 可溶性糖, 淀粉, 构件, 碳分配, 裸岩率, 干旱

Abstract: [Objective] This study aimed to investigate the concentration and distribution pattern of non-structural carbohydrate (NSC) in Phyllostachys glauca, a dominant species in limestone mountains, and the ecological significance.[Method]The NSC concentration and distribution characteristics of individual (whole plant)and component level (leaf, branch, stem, stump, rhizome and root) of P. glauca in three different soil moisture habitats (continuous soil, semi-continuous soil and sporadic soil) in the limestone mountain area of Northwest Jiangxi Province were measured and analyzed.[Result]The results showed that:1) At individual level, from continuous soil and semi-continuous soil to sporadic soil, the concentration of soluble sugars increased gradually with the decrease of soil water content, and the value in sporadic soil (3.32% ±0.20%) was significantly higher than that in continuous soil (2.52% ±0.17%) (P< 0.05). The starch and NSC concentration decreased initially and then increased, and the values in semi-continuous soil were all significantly lower than those in sporadic soil (P < 0.05). 2) At the component level, the concentration of NSC, soluble sugars and starch in leaves were the highest in the three habitats, followed by branches and roots, and relatively lower in stems, stumps and rhizomes. 3)With the decrease of soil water content, the increment of soluble sugars concentration in P. glauca roots was greater than that in other parts. Compared with the value in continuous soil habitat, that in semi-continuous soil and sporadic soil increased by 74.29%, and 39.35%, respectively. The distribution proportion of soluble sugars in the components with high physiological activity (leave and root) in sporadic soil habitat increased by 71.26% and 50.61%, respectively compared with that in continuous soil habitats, while the distribution proportion in the stored components of stems, stumps and rhizomes decreased.[Conclusion]Our studies indicate that P. glauca has a physiological mechanism to cope with drought stress by regulating the concentration and distribution of non-structural carbohydrate both at individual and component level. The NSC regulation behavior at the component level can reflect the physiological strategies of plants to cope with drought stress more deeply than that at the individual level.

Key words: Phyllostachys glauca, soluble sugar, starch, component, carbon distribution, bare rock rate, drought

中图分类号:

S718.43

梁宽, 樊燕, 冯火炬, 谈太腾, 施建敏. 不同石灰岩生境淡竹非结构性碳水化合物浓度及分配特征[J]. 林业科学, 2019, 55(6): 22-27.

Liang Kuan, Fan Yan, Feng Huoju, Tan Taiteng, Shi Jianmin. Concentration and Distribution Pattern of Non-Structural Carbohydrate of Phyllostachys glauca in Different Limestone Habitats[J]. Scientia Silvae Sinicae, 2019, 55(6): 22-27.

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