栓皮栎粗根和茎干中非结构性碳水化合物含量的调配关系

doi:10.11707/j.1001-7488.20210121

摘要/Abstract

摘要：

目的: 探讨非结构性碳水化合物(NSC)及其组分含量的季节动态变化规律和在栓皮栎不同器官间的调配关系，为阐明栓皮栎生长过程中的碳调配机制提供参考。方法: 以秦岭东段栓皮栎优势群落为研究对象，对栓皮栎生长季、非生长季粗根和茎干NSC及其组分含量进行测定，并分析两器官各指标间的相关性。同期，通过直接观察监测叶物候指标。结果: 1) 栓皮栎粗根和茎干NSC及其组分含量均随时间变化存在显著差异(P < 0.05)，粗根NSC含量均值(13.96%)高于茎干(6.24%)，这主要与器官的功能性差异有关。2)除淀粉外，NSC、可溶性糖和可溶性糖与淀粉比值在粗根和茎干间均存在较强的相关性(P < 0.05)。3)茎干NSC含量峰值较粗根相比有滞后性(约半个月)。粗根NSC含量下降同期茎干径向生长启动，其NSC含量上升到最大值，这说明栓皮栎器官间存在碳调配关系。由于栓皮栎展叶时间晚于茎干径向生长，茎干径向生长启动所需的碳水化合物可能来源粗根中储存的NSC。结论: 栓皮栎粗根和茎干NSC及其组分含量具有明显的季节动态变化，粗根和茎干之间存在NSC动态调配关系。

关键词: 非结构性碳水化合物(NSC), 栓皮栎, 季节动态, 粗根, 茎干, 调配关系

Abstract:

Objective: Non-structural carbohydrates (NSC) reserves support tree metabolism and growth when current photosynthates are insufficient, offering resilience in times of stress. Thus, investigation of seasonal dynamic patterns of NSC and the components and the allocation relationship among different organs of trees will help us to better understand the mechanism of carbon allocation in the process of tree growth. Method: In this study, the contents of NSC and its components in coarse roots and stems of the dominant species, Quercus variabilis, in the eastern part of Qinling Mountains, China in growing season and non-growing season were determined. The experiment was conducted from May 2016 to June 2017.We collected samples at semimonthly/monthly intervals during the leaf unfolding period from March to May, atmonthly/bimonthly during the leaf full growing season from June to November, and by one time during non-growing season in February. A total of approximately 130 samples were used to determine their NSC concentrations by Anthrone-sulfuric acid method and the correlations between coarse roots and stems in NSC concentrations were analyzed. Concurrently, the leaf phenology was monitored by direct observation. Result: 1) The contents of NSC and its components in coarse roots and stems of Q. variabilis were significantly different with time(P < 0.05), and the mean content of NSC in coarse roots(13.96%)was much higher than that in stems(6.24%), which was mainly related to the functional differences between the two organs. 2)There were positive correlations in NSC, soluble sugar contents and the ratio of soluble sugar to starch between coarse roots and stems(P < 0.05), but no significant correlation in starch concentration between them. 3)The peak value of NSC concentration in stems occurred in March, whereas that in coarse roots did in February, lagging behind about half a month. This difference between two organs could be explained by the carbon coordination between coarse roots and stems.The increase of stem NSC was synchronized with the decrease of thick root NSC, which followed by carbon demand for annual stem growth initiation. As a ring-porous tree, Q. variabilis leaf bud burst generally occurs after stem growth. Thus, before leaf unfolding, coarse roots provide NSC for the stem growth. Conclusion: The NSC concentrations in the coarse roots and stems of Q. variabilis has an obvious seasonal dynamic change. The species shows coordinated response of carbon storage and growth between coarse roots and stems.

Key words: non-structural carbohydrates, Quercus variabilis, seasonal dynamics, coarse root, stem, coordination

中图分类号:

S718.43

徐军亮,竹磊,师志强,武靖,章异平. 栓皮栎粗根和茎干中非结构性碳水化合物含量的调配关系[J]. 林业科学, 2021, 57(1): 200-206.

Junliang Xu,Lei Zhu,Zhiqiang Shi,Jing Wu,Yiping Zhang. Allocation of Non-Structural Carbohydrates Content in Coarse Roots and Stems of Quercus variabilis[J]. Scientia Silvae Sinicae, 2021, 57(1): 200-206.

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非结构性碳水化合物 Non-structural carbohydrate	变异来源 Source of variation	df	F	P
可溶性糖 Soluble sugar(SS)	器官Organ	1	23.905	＜0.01
	采样日期Sampling date	12	6.781	＜0.01
	器官×采样日期Organ× Sampling date	12	1.451	0.174
淀粉 Starch(S)	器官Organ	1	140.180	＜0.01
	采样日期Sampling date	12	7.251	＜0.01
	器官×采样日期Organ× Sampling date	12	3.420	＜0.01
非结构性碳水化合物 Non-structural carbohydrate(NSC)	器官Organ	1	197.052	＜0.01
	采样日期Sampling date	12	11.128	＜0.01
	器官×采样日期Organ× Sampling date	12	3.499	＜0.01
可溶性糖/淀粉 Soluble sugar/Starch(SS/S)	器官Organ	1	11.863	＜0.01
	采样日期Sampling date	12	12.452	＜0.01
	器官×采样日期Organ× Sampling date	12	1.987	0.045

	Coarse_SS	Coarse_S	Coarse_NSC	Coarse_SS/S	Stem_SS	Stem_S	Stem_NSC
Coarse_S	0.252
Coarse_NSC	0.488	0.968^**
Coarse_SS/S	0.313	-0.648^*	-0.503
Stem_SS	0.648^*	0.317	0.455	0.200
Stem_S	0.512	0.518	0.600^*	-0.259	0.343
Stem_NSC	0.687^**	0.527	0.654^*	-0.086	0.741^**	0.885^**
Stem_SS/S	0.180	-0.479	-0.385	0.803^**	0.397	-0.530	-0.182

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