汪忠华, 陈双林, 胡瑞财, 等. 苦竹向茶园扩张后不同年龄立竹叶片的功能性状变化特征研究[J]. 西南林业大学学报(自然科学), 2024, 44(5): 1–10 . DOI: 10.11929/j.swfu.202311059
引用本文: 汪忠华, 陈双林, 胡瑞财, 等. 苦竹向茶园扩张后不同年龄立竹叶片的功能性状变化特征研究[J]. 西南林业大学学报(自然科学), 2024, 44(5): 1–10 . DOI: 10.11929/j.swfu.202311059
Wang Zhonghua, Chen Shuanglin, Hu Ruicai, Guo Ziwu, Jiang Xiuqin, Fan Lili. Response of Leaf Functional Traits of Pleioblastus Amarus During the Expansive Process into the Tea Plantations[J]. Journal of Southwest Forestry University. DOI: 10.11929/j.swfu.202311059
Citation: Wang Zhonghua, Chen Shuanglin, Hu Ruicai, Guo Ziwu, Jiang Xiuqin, Fan Lili. Response of Leaf Functional Traits of Pleioblastus Amarus During the Expansive Process into the Tea Plantations[J]. Journal of Southwest Forestry University. DOI: 10.11929/j.swfu.202311059

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苦竹向茶园扩张后不同年龄立竹叶片的功能性状变化特征研究

Response of Leaf Functional Traits of Pleioblastus Amarus During the Expansive Process into the Tea Plantations

  • 摘要: 为探究苦竹茶园扩张后叶片形态性状及养分变化规律,揭示其环境适应策略及觅养特征。以连续成片的苦竹−茶园扩张林分为研究对象,设置4种样地,分别为苦竹中心区(BF)、苦竹界面区(BA)、混交林界面区(MA)和混交林中心区(TB),分析1年生和2年生立竹的叶功能性状在扩展方向的变化特征。结果表明:沿苦竹向茶园扩张方向,1年生立竹叶形态性状呈逐渐增大趋势,在TB样地表现最高,但2年生立竹叶片形态性状随苦竹向茶园扩张呈“V”型变化,各指标在样地BA表现最低;1年生立竹叶比表面积及叶面积波动不对称性值在界面区(BA和MA)显著降低,但2年生立竹该指标在各样地间差异不显著。1年生立竹叶片CNP含量在BA样地显著高于其他样地,而2年生立竹叶片CN含量表现相反。不同年龄立竹叶片C∶N、C∶P、N∶P沿苦竹向茶园扩张方向均呈“V”型变化,在BA样地显著降低。随扩张进行,1年生立竹叶宽、叶面积、叶厚、叶干质量和比叶面积指标逐渐高于2年生立竹,在TB样地差异明显;各样地间1年生立竹CNP含量均高于2年生立竹,但C∶N、C∶P、N∶P表现相反,各指标在BA样地呈明显的年龄差异。总体而言,苦竹立竹叶功能性状间的权衡关系沿扩展方向发生了适应性调整,在资源竞争激烈的竹茶界面区域具有显著的年龄效应。

     

    Abstract: Changes in leaf morphological characteristics and nutrient content of Pleioblastus amarus during its expansion into tea gardens can reveal the adaptation strategies and nutrient acquisition characteristics. In this study, we examined the leaf morphological characteristics, carbon (C), nitrogen (N), phosphorus (P) contents, and stoichiometric ratios of 1-year-old and 2-year-old P. amarus leaves among four forest types P. amarus forest central area (BF), P. amarus forest interface area (BA), mixed forest interface area (MA), and mixed forest center area (TB). Along the direction of the expansion of P. amarus to the tea plantation, the leaf morphology of 1-year-old bamboo showed a trend of gradual increase, and the performance was the highest in the TB sample site, but the leaf morphology of 2-year-old bamboo showed a "V"-shaped change with the expansion of P. amarus to the tea plantation, and the performance of each index was the lowest in the sample site BA; The values of the specific surface area of the leaf and the fluctuating asymmetricity of the leaf area of 1-year-old bamboo decreased significantly (P<0.05) in the interfacial zone (BA and MA), but the differences of this index among the sample sites were not significant in 2-year-old bamboo. The CNP content of the 1-year-old bamboo leaf was significantly higher (P < 0.05) than that of other samples in the BA sites, while the CN content of the 2-year-old bamboo leaves showed the opposite behavior. The C: N, C∶P, and N∶P of leaves of different ages of standing bamboo showed a "V" type change along the direction of the expansion of bitter bamboo to the tea plantation, and decreased significantly (P<0.05) in the BA sites. The leaf width, leaf area, leaf thickness, leaf dry weight, and specific leaf area indexes of 1-year-old bamboo were gradually higher than those of 2-year-old bamboo with expansion, and the differences were obvious in the TB sites; the CNP content of 1-year-old bamboo was higher than that of 2-year-old bamboo among all the sampling plots, but the performance of C: N, C: P and N: P was opposite, and all the indexes showed obvious age differences in the BA sites. Overall, the trade-off relationships among functional traits of P. amarus leaves were adaptively adjusted along the direction of expansion, with significant age effects in the bamboo-tea interface region where resource competition is intense.

     

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