闽江河口秋茄异龄叶性状及其叶经济谱

doi:10.13287/j.1001-9332.202505.008

摘要/Abstract

摘要： 为明晰秋茄群落异龄叶在资源受限环境中的适应性机制和策略,选取闽江河口湿地国家级自然保护区的秋茄异龄叶(当年生叶和往年生叶)的21个叶功能性状,比较当年生和往年生叶性状之间的差异,构建秋茄异龄叶的叶经济谱。结果表明: 秋茄往年生叶的鲜重与干重均是当年生叶的2.3倍,秋茄当年生叶和往年生叶的N含量差异显著,分别为20.59和15.88 mg·g^-1,P含量差异显著,分别为1.40和1.06 mg·g^-1,且N和P含量之间呈现显著正相关。当年生叶和往年生叶的净光合速率差异显著,分别为7.53和4.68 μmol·m^-2·s^-1,气孔导度差异显著,分别为0.16和0.15 mol·m^-2·s^-1。异龄叶经济谱显示,当年生叶具有叶片较薄、伸展速度快、光合效率高、叶片组织密度低、N和P含量高的特性,采取了快速投资-收益型的生长策略;往年生叶则表现出叶片较厚、伸展速度慢、光合效率低、叶片组织密度高、N和P含量低的特点,更倾向于采取缓慢投资-收益型的保守策略。秋茄通过调整叶片结构和理化性状,形成了2种不同的生长策略,在较为恶劣的生境中展现出更强的生存能力。

关键词: 秋茄, 叶经济谱, 叶龄, 适应策略, 叶功能性状

Abstract: To elucidate the adaptive mechanisms and strategies of different-aged leaves of Kandelia obovata in response to resource limitations in the Minjiang River Estuary Wetland Nature Reserve, we measured 21 leaf functional traits from current-year and previous-year leaves, and compared the traits between the two leaf types to construct leaf economic spectrum. The results showed that the fresh and dry weight of K. obovata in the previous-year leaves was 2.3 times of current-year leaves. There was a significant difference in nitrogen (N) content, with values of 20.59 mg·g^-1 for current-year leaves and 15.88 mg·g^-1 for previous-year leaves, as well as in phosphorus (P) content, with values of 1.40 and 1.06 mg·g^-1, respectively. There was a significant positive correlation between N and P content. The net photosynthetic rate differed significantly, with values of 7.53 and 4.68 μmol·m^-2·s^-1 for current-year and previous-year leaves, respectively. There was a significant difference in stomatal conductance (0.16 vs. 0.15 mol·m^-2·s^-1). The economic spectrum indicated that current-year leaves possessed traits such as thin structure, rapid extension, high photosynthetic efficiency, low leaf tissue density, and higher N and P content, reflecting a strategy of rapid investment and return. In contrast, previous-year leaves exhibited thicker structure, slower extension, lower photosynthetic efficiency, higher leaf tissue density, and lower N and P content, adopting a more conservative and slow-investment growth strategy. These findings suggested that K. obovata employed two distinct growth strategies, adjusting leaf structure and physiological properties to enhance its survival in stressed environments.

Key words: Kandelia obovata, leaf economic spectrum, leaf age, adaptation strategy, leaf functional trait

陈瑞鑫, 简婷怡, 林勇明, 王英姿, 洪滔. 闽江河口秋茄异龄叶性状及其叶经济谱[J]. 应用生态学报, 2025, 36(5): 1330-1338.

CHEN Ruixin, JIAN Tingyi, LIN Yongming, WANG Yingzi, HONG Tao. Traits and economic spectrum of different-aged leaf of Kandelia obovata in Minjiang River estuary, China[J]. Chinese Journal of Applied Ecology, 2025, 36(5): 1330-1338.

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