基于CSR策略的苏州常见园林植物叶功能性状对土壤碳氮比的适应性

Adaptation of Leaf Functional Traits of Common Ornamental Plants in Suzhou to Soil C/N Ratio Under CSR Strategies

摘要

【目的】探讨苏州城市建成区12种常见园林植物叶功能性状对绿地土壤碳氮比(C/N)梯度的响应, 以及植物资源面对土壤碳氮比梯度的分配模式, 为后续不同土壤碳氮资源水平下的植物配置提供科学依据。【方法】测量苏州城市建成区12种常见植物的叶干物质含量(LDMC)、比叶面积(SLA)、单位质量叶碳含量(C_mass)、单位质量叶氮含量(N_mass)等关键叶功能性状, 并基于CSR策略, 分析、探讨植物叶功能性状、土壤C/N梯度、CSR策略之间的关联。【结果】随着土壤C/N的降低, LDMC、C_mass、N_mass呈下降趋势; 城市环境下园林植物普遍表现出胁迫耐受的策略倾向, 大部分属于S/CS策略类型, 在不同的碳氮比梯度区, 不同植物的得分表现各有不同, 总体在C轴和S轴上的分布较R轴更为离散。CSR策略得分与叶功能性状显著相关: C策略得分与SLA、LDMC、N_mass负相关, 与C_mass正相关; S策略得分与SLA、C_mass负相关, 与LDMC、N_mass正相关; R策略得分与LDMC、C_mass负相关, 与SLA、N_mass正相关。【结论】苏州城市建成区各样地间土壤碳氮化学计量存在差异, 并影响植物叶功能性状表征及其CSR策略权衡, 揭示苏州常见的12种园林植物在不同的土壤碳氮比梯度变化中呈现的适应性策略: 如广玉兰等植物在更高的碳氮比梯度中通过SLA的下降表现出了较强的竞争型策略, 而海桐等植物在更低的碳氮比梯度中通过N_mass的增加表现出更强的耐逆型策略。未来研究可进一步拓展至草本园林植物群, 为多层次、近自然的植物群落配置提供系统依据。

Abstract

【Objective】This study explores how the leaf functional traits of 12 common plant species in the built area of Suzhou City respond to different gradients of soil carbon-to-nitrogen (C/N) ratios and the patterns of plant resource allocation in response to this soil C/N gradient, thereby providing scientific evidence for plant configurations under varying carbon and nitrogen resource levels. 【Method】Key leaf functional traits of the 12 common plant species are measured, including LDMC, SLA, C_mass, and N_mass. Focusing on their CSR strategies, the study analyzes and explores the relationships between plant leaf functional traits, the soil C/N gradient, and CSR strategies. 【Result】As the soil C/N decreases, LDMC, C_mass and N_mass show a declining trend. Garden plants in the urban environment generally exhibit a stress-tolerance strategy, while most plants take the S/CS strategy. In different C/N gradients, different plants have varied scores, and the distribution of the tested plants is more dispersed along the C and S axes compared to that along the R axis. CSR strategy scores are significantly correlated with leaf functional traits: C strategy score is negatively correlated with SLA, LDMC and N_mass, but positively correlated with C_mass; S strategy score is negatively correlated with SLA and C_mass, but positively correlated with LDMC and N_mass. R strategy score is negatively correlated with LDMC and C_mass, but positively correlated with SLA and N_mass. 【Conclusion】Differences in soil carbon-to-nitrogen stoichiometry are observed among various sample sites within the urban built-up area of Suzhou, which further affect the characterization of plant leaf functional traits and the trade-offs in their CSR strategies. This reveals the adaptive strategies of 12 common ornamental plant species in Suzhou along gradients of soil C/N ratio. For example, species such as Magnolia grandiflora exhibit a stronger competitive strategy along higher soil C/N ratio gradients, which is indicated by a decrease in specific leaf area (SLA), whereas species such as Pittosporum tobira display a stronger stress-tolerant strategy along lower soil C/N ratio gradients, reflected in an increase in leaf nitrogen content per unit mass (N_mass). Future studies could place the focus on herbaceous plant communities to provide a systematic basis for the configuration of multi-layered and near-natural plant communities.

关键词

城市土壤 / 碳氮化学计量 / 叶功能性状 / CSR策略 / 植物配置

Key words

urban soil / carbon-to-nitrogen stoichiometry / leaf functional trait / CSR strategy / plant configuration

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基金资助

*国家自然科学基金青年项目(52008280)

国家自然科学基金青年项目(52308029)

黑龙江省科学院人才队伍建设项目(RC2024ZR01)

“十四五”江苏省重点学科建设项目(风景园林学)(082240006/002/002)

黑龙江省科学院双提雁阵项目(STYZ2022ZR01)

黑龙江省博士后基金(LBN-Z23263)