生物多样性 ›› 2020, Vol. 28 ›› Issue (3): 277-288.doi: 10.17520/biods.2019118

• 研究报告 • 上一篇    下一篇

微生境对黄梅秤锤树野生种群叶片功能性状的影响

王世彤1, 2, 3, 徐耀粘1, 2, 3, 杨腾1, 2, 3, 4, 5, 魏新增1, 2, 3, *(), 江明喜1, 2, 3   

  1. 1. 中国科学院武汉植物园水生植物与流域生态重点实验室, 武汉 430074
    2. 中国科学院核心植物园保护生物学中心, 武汉 430074
    3. 中国科学院大学, 北京 100049
    4. 西藏大学青藏高原生态与环境研究中心, 拉萨 850000
    5. 西藏大学理学院, 拉萨 850000
  • 收稿日期:2019-04-04 接受日期:2019-08-02 出版日期:2020-03-20
  • 通讯作者: 魏新增 E-mail:xzwei@wbgcas.cn
  • 基金项目:
    国家重点研发计划(2016YFC0503100);“极小种群野生植物迁地保护技术研究与示范”课题(2016YFC0503105);国家自然科学基金(31570528)

Impacts of microhabitats on leaf functional traits of the wild population of Sinojackia huangmeiensis

Shitong Wang1, 2, 3, Yaozhan Xu1, 2, 3, Teng Yang1, 2, 3, 4, 5, Xinzeng Wei1, 2, 3, *(), Mingxi Jiang1, 2, 3   

  1. 1. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074
    2. Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Wuhan 430074
    3. University of Chinese Academy of Sciences, Beijing 100049
    4. Research Center for Ecology and Environment of Qinghai-Tibetan Plateau, Tibet University, Lhasa 850000
    5. College of Science, Tibet University, Lhasa 850000
  • Received:2019-04-04 Accepted:2019-08-02 Online:2020-03-20
  • Contact: Xinzeng Wei E-mail:xzwei@wbgcas.cn

植物功能性状可以反映植物应对环境变化的适应策略。本文以黄梅秤锤树(Sinojackia huangmeiensis)当前唯一野生种群为对象, 比较了3种微生境(湖边、种群中心、耕地边)中该物种的叶片功能性状均值、种内变异和叶片生态化学计量特征的差异, 分析了黄梅秤锤树对湖岸带微生境变化的响应及其适应策略。结果表明: (1) 3种微生境中土壤C、N、P含量没有显著性差异(P > 0.05), 但土壤C∶N和C∶P具有显著性差异(P < 0.05), 土壤类型和养分条件有所不同。(2)黄梅秤锤树叶片功能性状的比较用单因素方差分析和贝叶斯方差分析得出的结果一致, 均为叶长、叶面积和比叶面积在中心区域显著高于湖边(P < 0.05), 而耕地边与湖边和中心区域均没有显著差异(P > 0.05); 叶N含量在湖边显著高于中心区域和耕地边(P < 0.05), 而中心区域和耕地边间没有显著差异(P > 0.05); 叶宽、叶长/叶宽、叶干物质含量、叶C和叶P含量在3种微生境间都没有显著性差异(P > 0.05)。(3)黄梅秤锤树叶片的N∶P在湖边显著高于中心区域和耕地边(P < 0.05), C∶N在湖边显著小于中心区域和耕地边(P < 0.05), N∶P和C∶N在中心区域和耕地边没有显著性差异(P > 0.05), C∶P在3种微生境间都没有显著性差异(P > 0.05)。(4)黄梅秤锤树叶片功能性状的总体变异程度在0.02-0.28之间, 其中叶片C和N含量在湖边和中心区域的种内变异程度显著较低, 表明3种生境中湖边和中心区域黄梅秤锤树种群的稳定性相对较差。(5)湖边黄梅秤锤树主要通过增加叶N含量促进生长; 中心区域黄梅秤锤树主要通过增加叶面积和比叶面积以及提高叶N的利用效率来提高光捕获能力促进生长; 耕地边黄梅秤锤树的叶N含量和叶面积、比叶面积都处于中等水平, 通过性状之间的共同作用使植株生长达到最佳水平。以上结果表明, 由于微地形、水位波动和土壤环境条件的差异, 黄梅秤锤树对3种生境中的适应策略有所不同, 并且不是通过单一性状调整来适应环境的变化, 而是通过多种性状之间的权衡达到更好的适应效果。

关键词: 植物功能性状, 生态化学计量学, 极小种群野生植物, 黄梅秤锤树, 贝叶斯方差分析, 湖岸带

Plant functional traits and stoichiometry characteristics can reflect differences in plant strategies to microenvironmental changes. In this study, we used a one-way ANOVA and Bayesian ANOVA to compare leaf functional traits, intraspecific variation, and leaf stoichiometry of Sinojackia huangmeiensis at three microhabitats (lakeside, population center, and cropland side) next to Longgan Lake, central China. Our results showed that: (1) There were no significant differences in soil C, N and P concentrations among the three microhabitats (P > 0.05), but soil C : N and C : P were significantly different (P < 0.05). (2) The results of one-way ANOVA and Bayesian ANOVA were similar when we compared mean values of leaf functional traits of S. huangmeiensis among the three microhabitats. Leaf length, leaf area, and specific leaf area were all significantly higher at population center than those at lakeside (P < 0.05), while the three leaf traits at cropland side were not different with those at lakeside or population center (P > 0.05); The leaf N content at lakeside was significantly higher than that at population center and cropland side (P < 0.05), but it was not different between population center and cropland side (P > 0.05); Leaf width, ratio of leaf length to leaf width, leaf dry matter content, leaf C content, and leaf P content were not significantly different among the three microhabitats (P > 0.05). (3) Leaf N : P of S. huangmeiensis at lakeside was significantly higher than that at population center and cropland side (P < 0.05). Leaf C : N at lakeside was significantly smaller than that at population center and cropland side (P < 0.05). Both leaf N : P and C : N were not different between population center and cropland side (P > 0.05). Leaf C : P was not different among the three microhabitats (P > 0.05). (4) The overall variation of leaf functional traits of S. huangmeiensis was between 0.02 and 0.28. Bayesian ANOVA showed that both leaf C and N contents had low degrees of intraspecific variation in lakeside and population center. (5) Sinojackia huangmeiensis’ growth was promoted by different factors at the varying microhabitats. Our results indicate that S. huangmeiensis strategies at three microhabitats were different and not single-trait dependent, but trade-off dependent to achieve a better adaptive effect.

Key words: plant functional traits, ecological stoichiometry, Wild Plant with Extremely Small Populations, Sinojackia huangmeiensis, Bayesian ANOVA, lakeshore zone

图1

样点位置(a)和3种微生境类型分布示意图(b)"

表1

3种微生境中土壤和黄梅秤锤树叶片的化学性质(平均值 ± 标准差)"

化学性质
Chemical property
土壤 Soil 叶片 Leaf
湖边 Lakeside 中心区域 Center 耕地边 Cropland side 湖边 Lakeside 中心区域 Center 耕地边 Cropland side
pH 4.11 ± 0.09a 3.91 ± 0.15a 4.06 ± 0.02a - - -
碳 C (g/kg) 70.68 ± 10.12a 44.70 ± 15.67a 54.91 ± 12.79a 442.78 ± 6.56A 442.20 ± 7.42A 443.71 ± 16.46A
氮 N (g/kg) 6.15 ± 0.89a 4.70 ± 1.66a 2.86 ± 1.38a 27.05 ± 2.00A 19.24 ± 1.62B 19.89 ± 4.78B
磷 P (g/kg) 2.34 ± 0.53a 2.41 ± 0.43a 1.56 ± 0.43a 1.69 ± 0.39A 2.07 ± 0.60A 1.85 ± 0.54A
碳/氮 C∶N 11.49 ± 0.37b 9.51 ± 0.16b 20.57 ± 4.47a 16.45 ± 1.14B 23.11 ± 1.72A 23.27 ± 4.38A
碳/磷 C∶P 30.84 ± 4.84a 18.25 ± 3.71b 36.00 ± 6.55a 273.91 ± 53.71A 227.53 ± 53.43A 254.46 ± 55.63A
氮/磷 N∶P 2.68 ± 0.34a 1.92 ± 0.40a 1.84 ± 0.64a 16.60 ± 2.86A 9.89 ± 2.47B 11.50 ± 4.16B

表2

黄梅秤锤树叶片功能性状的总体特征"

叶片功能性状
Leaf functional traits
最小值
Minimum
最大值
Maximum
倍数差异
Fold range
变异系数
Coefficient of variation
叶面积 Leaf area (cm2) 10.77 29.25 2.72 0.17
叶长 Leaf length (cm) 5.27 9.50 1.80 0.11
叶宽 Leaf width (cm) 3.01 5.11 1.70 0.10
叶长/叶宽 Ratio of leaf length to leaf width 1.55 2.07 1.34 0.06
比叶面积 Specific leaf area (cm2/g) 19.63 38.47 1.96 0.14
叶干物质含量 Leaf dry matter content (mg/g) 223.35 403.24 1.81 0.12
叶片碳含量 Leaf carbon content (g/kg) 393.69 459.47 1.17 0.02
叶片氮含量 Leaf nitrogen content (g/kg) 12.26 31.29 2.55 0.21
叶片磷含量 Leaf phosphorus content (g/kg) 1.27 3.78 2.98 0.28

图2

3种微生境中黄梅秤锤树的叶片功能性状均值( ± 标准差)及变异系数。不同小写字母代表同一叶片功能性状均值在微生境间差异显著(P < 0.05)。"

图3

基于贝叶斯方差分析计算的3种微生境中黄梅秤锤树叶片功能性状均值和种内变异程度比较。针对同一性状参数, 如果不同微生境的95%置信区间没有重叠, 表明该参数在不同微生境间差异显著; 反之如果重叠则表明差异不显著。"

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