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林业科学 ›› 2021, Vol. 57 ›› Issue (12): 155-166.doi: 10.11707/j.1001-7488.20211216

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海南岛热带低地雨林2种攀缘竹的叶片功能性状差异

徐瑞晶1,胡璇1,刘广路1,*,郭雯1,梁昌强2,孔祥河2   

  1. 1. 国际竹藤中心 北京 100102
    2. 海南省甘什岭自然保护区管理站 三亚 572000
  • 收稿日期:2020-11-25 出版日期:2021-12-25 发布日期:2022-01-26
  • 通讯作者: 刘广路
  • 基金资助:
    国际竹藤中心基本科研业务费(1632019027);国际竹藤中心基本科研业务费(1632017007);林业科技创新平台运行补助项目(2020132511)

Differences of Leaf Functional Traits Between Two Climbing Bamboo Species in Tropical Lowland Rainforest of Hainan Island

Ruijing Xu1,Xuan Hu1,Guanglu Liu1,*,Wen Guo1,Changqiang Liang2,Xianghe Kong2   

  1. 1. International Centre for Bamboo and Rattan Beijing 100102
    2. Management Station of Ganshiling Natural Reserve in Hainan Province Sanya 572000
  • Received:2020-11-25 Online:2021-12-25 Published:2022-01-26
  • Contact: Guanglu Liu

摘要:

目的: 研究喜阳并多分布于林缘或林窗阳光充足处的无耳藤竹和较为耐荫并多分布在林下弱光环境中的响子竹,探究攀缘竹在热带低地雨林的生存策略,为攀缘竹的资源保护和利用提供科学依据。方法: 分别于2019年6、9、12月和2020年3月,利用LI-6400便携式光合作用系统测定海南岛甘什岭无耳藤竹和响子竹的叶片光合气体交换参数,而后采用石蜡切片、叶表皮离析法观测叶片解剖结构,并测定单叶面积、叶片干物质含量和比叶面积。结果: 1) 无耳藤竹的净光合速率、气孔导度、胞间二氧化碳浓度和蒸腾速率在6月和9月较高,12月最低; 水分利用效率则相反。响子竹的净光合速率、气孔导度、胞间二氧化碳浓度和蒸腾速率在9月最高,3月和6月较低; 水分利用效率在3月最高,9月最低。除12月的胞间二氧化碳浓度外,无耳藤竹的净光合速率、气孔导度、胞间二氧化碳浓度和蒸腾速率在各月均高于响子竹。2) 2种攀缘竹的叶厚、泡状细胞数量、泡状细胞截面积、二级维管束直径、二级维管束截面积、二级维管束间距和气孔器面积占比均为雨季(6、9月)高于旱季(12、3月)。无耳藤竹的叶厚、气孔宽度、单个气孔器面积、气孔器面积占比在各月均高于响子竹,但乳突厚度、上表皮厚度、二级维管束间距和气孔密度均低于响子竹。3) 2种攀缘竹的单叶面积、叶片干物质含量和比叶面积在各月间的最大值和最小值差异显著(P<0.05),比叶面积的种间差异不明显(P>0.05)。4) 无耳藤竹的各指标可塑性总体高于响子竹,这反映了无耳藤竹的环境适应能力高于响子竹。结论: 无耳藤竹凭借其叶片较大的光合能力、叶厚、气孔和较低的单叶面积、比叶面积、二级维管束间距,能够适应林冠层强光环境、冠层水分亏缺和旱季胁迫。响子竹则以其叶片较高的单叶面积、比叶面积、上表皮厚度、乳突厚度和较薄的叶片及小而密的气孔,能够适应旱季胁迫和林下弱光环境。叶片功能性状决定了热带低地雨林2种攀缘竹的不同生存和适应策略。

关键词: 攀缘竹, 叶片结构解剖, 光合特性, 叶片功能性状

Abstract:

Objective: Both Dinochloa orenuda and Bonia levigata are climbing bamboos distributed in the tropical lowland rainforest of Hainan Island. The former species is a heliophiles distributed in forest edges and forest gaps while the latter one is a skiophyte in the low light environment. This paper aimed to explore the survival strategies of the two bamboo species in the tropical lowland rainforest, so as to provide a knowledge for the protection and utilization of climbing bamboo resources. Method: D. orenuda and B. levigata were sampled from Ganshiling, Hainan Island in June, September, December 2019, and March 2020. The leaf anatomical structure, leaf gas exchange parameters, leaf area, leaf dry-matter content, and specific leaf area were studied by using paraffin section, leaf epidermis isolation, and LI-6400 portable photosynthesis system, respectively. Result: 1) The net photosynthetic rate (Pn), stomatal conductance (Cond), intercellular carbon dioxide concentration (Ci), and transpiration rate (Tr) of D. orenuda were higher in June and September than those in December. In contrast to these characteristics, the water use efficiency (WUE) of D. orenuda had an opposite trend in these months. The net photosynthetic rate, stomatal conductance, intercellular carbon dioxide concentration, and transpiration rate of B. levigata were the highest in September and lower in March and June, but water use efficiency was the highest in March and the lowest in September. Except for the intercellular carbon dioxide concentration in December, the net photosynthetic rate, stomatal conductance, intercellular carbon dioxide concentration, and transpiration rate of D. orenuda were higher than those of B. levigata in each month, respectively. 2) The leaf thickness (LT), number of bulliform cells (NBC), sectional area of bulliform cells (SABC), diameter of second-order vascular bundle (DSVB), sectional area of second-order vascular bundle (SASVB), distance between second-order vascular bundle (DBAVB), and percent of stomata area (AP) of the two bamboos were the higher in the rainy season (June, September) than those in the dry season (December, March). Besides, the LT, stomata width (SW), single stomata area (AS), and AP of D. orenuda were higher than those of B. levigata in each month. Whereas the mastoid process thickness (MPT), upper epidermal thickness (UET), DBAVB, and stomata density(SD) of D. orenuda were lower than those of B. levigata in the same time periods, respectively. 3) There were significant differences (P < 0.05) in the maximum and minimum of single leaf area (LA), leaf dry-matter content (LDMC), and specific leaf area (SLA) between D. orenuda and B. levigata in each month, but there was no significant difference(P > 0.05) in SLA between D. orenuda and B. levigata. 4) The plasticity of various indicators of D. orenuda was higher than that of B. levigata, which reflected that D. orenuda had higher adaptability to the environment than B. levigata. Conclusion: With its relatively large photosynthetic capacity, LT, AS, and relatively lower LA, SLA, and DBAVB, D. orenuda can adapt to forest canopy strong light environment, canopy water deficit, and dry season stress. However, B. levigata can adapt to drought stress and weak light environment under the forest with higher LA, SLA, UET, and MPT, thinner leaf thickness, and small and dense stomata. Our results have revealed that the functional traits of leaves determine different survival and adaptive strategies of the two climbing bamboos.

Key words: climbing bamboo, leaf anatomy, photosynthetic characteristics, leaf functional traits

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