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| 毛竹开花时期C、N、P化学计量的变化特征 |
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胡潇雪1,2, 郭 靖1,2, 农珺清2, 李在留1*, 徐振国2*
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1. 广西大学 林学院, 中南速生材繁育国家林业和草原局重点实验室, 广西高校亚热带人工林培育与利用重点实验室, 南宁 530004;2. 广西壮族自治区林业科学研究院, 广西林业实验室, 广西优良用材林资源培育重点实验室, 南宁 530002
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| 摘要: |
| 生态化学计量学是阐释植物关键生命周期中养分分配与利用机制的学科。为揭示竹类植物在生殖生长阶段的化学计量适应机制与养分资源调配策略,该研究以广西桂林北部开花毛竹(Phyllostachys edulis)为对象,系统分析其在开花前期、初期、盛期与末期各器官[竹秆、竹枝、竹叶/花穗、竹蔸、蔸根、竹鞭、鞭根]的C、N、P含量及其化学计量比。结果表明:(1)各器官C、N、P含量在不同时期均呈现显著性差异和动态变化。竹枝C含量始终最高; 竹叶/花穗N在开花前期达峰值,P则在盛期最高; 竹秆P、竹枝C以及竹叶N呈持续下降趋势; 竹鞭C、N含量先降后升; 而竹枝、蔸根和鞭根P含量则先升后降。(2)在化学计量比方面,C:N以开花初期的竹秆最高,C:P以开花末期的鞭根最高,N:P则以开花前期的竹鞭最高。(3)各时期器官间C、N、P含量及其比值存在显著(P<0.05)或极显著(P<0.01)相关关系,体现出高度协调的养分分配机制与鲜明的阶段性特征。综上,毛竹开花时,竹枝等营养器官富集C以维持稳态,竹叶/花穗则积累N、P支持代谢,整体呈现“C稳态、P受限、N再分配”的生态适应策略,保障繁殖需求。 |
| 关键词: 毛竹, 开花, 器官, C、N、P含量, 化学计量比, 动态变化 |
| DOI：10.11931/guihaia.gxzw202507013 |
| 分类号:Q948 |
| 文章编号:1000-3142(2026)06-1016-11 |
| Fund project:广西林业科技推广示范项目( [2025]GT12); 广西重点研发计划项目(桂科AB25069350); 广西壮族自治区林业科学研究院研究团队项目(2024RT18)。 |
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| Characteristics of C, N, and P stoichiometric dynamics during flowering period of Phyllostachys edulis |
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HU Xiaoxue1,2, GUO Jing1,2, NONG Junqing2, LI Zailiu1*, XU Zhenguo2*
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1. Guangxi Colleges and Universities Key Laboratory for Cultivation and Utilization of Subtropical Forest Plantation, Key Laboratory of
National Forestry and Grassland Administration on Cultivation of Fast-Growing Timber in Central South China, College of Forestry,
Guangxi University, Nanning 530004, China;2. Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation,
Guangxi Laboratory of Forestry, Guangxi Forestry Research Institute, Nanning 530002, China
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| Abstract: |
| Ecological stoichiometry is a discipline that elucidates how plants regulate nutrient allocation and utilization across critical life-history stages. To explore the stoichiometric adaptation mechanisms and nutrient resource allocation strategies of bamboo plants, using naturally flowering P. edulis in northern Guilin, Guangxi, China as the study material, we quantified carbon(C), nitrogen(N), and phosphorus(P)contents, along with their stoichiometric ratios(C:N, C:P, N:P)across seven organ types [culm, branch, leaf/flower spike, culm stump, culm root, rhizome, and rhizome root] during four flowering periods: pre-flowering, initial flowering, peak flowering, and late flowering. The objective was to elucidate the underlying stoichiometric adaptation mechanisms and resource reallocation strategies that underpin reproductive investment in bamboo. The results were as follows:(1)The C, N, and P contents in different organs exhibited significant differences and temporal dynamics across all four periods. Branches consistently exhibited the highest C content; leaf/flower spike N peaked during pre-flowering, whereas P peaked at peak flowering; culm P, branch C, and leaf N declined monotonically throughout flowering; rhizome C and N showed a unimodal pattern(decreasing then increasing); and P in branches, culm roots, and rhizome roots followed an inverse unimodal trajectory(increasing then decreasing).(2)Stoichiometric ratios displayed distinct spatiotemporal patterns. C:N reached its maximum in culms during initial flowering; C:P peaked in rhizome roots at late flowering; and N:P was the highest in rhizomes during pre-flowering.(3)Significant(P < 0.05)or highly significant(P < 0.01)correlations were observed among C, N, and P contents and ratios across organs within each period, indicating tightly coordinated, stage-dependent nutrient partitioning. In conclusion, during the flowering period of P. edulis, vegetative organs such as branches accumulate C to maintain homeostasis, while leaves/flower spikes accumulate N and P to support metabolic processes. This overall pattern reflects an ecological adaptation strategy characterized by “C homeostasis, P limitation, and N redistribution” ensuring reproductive demands. |
| Key words: Phyllostachys edulis, flowering, organ, C, N, and P contents, stoichiometric ratios, dynamic changes |
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