长江流域资源与环境 >> 2024, Vol. 33 >> Issue (5): 993-1003.doi: 10.11870/cjlyzyyhj202405008

• 自然资源 • 上一篇    下一篇

亚热带同质园不同树种枝、叶氮磷含量及其重吸收特征

赖明玥1,何樟儒2,朱鹏1,杨玉莲3,李婧1,李济宏1,贾世冰1,李晗1,张丽1,谭波1,徐振锋1,游成铭1*
  

  1. (1. 长江上游林业生态工程四川省重点实验室,长江上游森林资源保育与生态安全国家林业和草原局重点实验室,
    华西雨屏区人工林生态系统研究长期科研基地,都江堰灵岩山常绿阔叶林省级长期科研基地,四川农业大学林学院,四川 成都 611130;2. 绵阳市安州区自然资源局,四川 绵阳 622651;3. 绵阳师范学院生态安全与保护四川省重点实验室,四川 绵阳 621000) 
  • 出版日期:2024-05-20 发布日期:2024-05-29

Nitrogen and Phosphorus Contents and Reabsorption Characteristics of Different Tree Species in A Subtropical Homogeneous Garden

LAI Ming-yue1, HE Zhang-ru2, ZHU Peng1, YANG Yu-lian3, LI Jing1, LI Ji-hong1, JIA Shi-bing1, LI Han1, ZHANG Li1, TAN Bo1, XU Zhen-feng1,YOU Cheng-ming1   

  1. (1. Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province, National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River, Rainy Area of West China Plantation Ecosystem Permanent Scientific Research Base, Permanent Scientific Research Base of Evergreen Broad-leaved Forest in the Lingyan Mountain of Dujiangyan, Forestry College of Sichuan Agricultural University, Chengdu 611130, China; 2. Natural Resources Bureau of Anzhou District, Mianyang City, Mianyang 622651, China; 3. Key Laboratory of Ecological Security and Protection in Sichuan Province, Mianyang Normal University, Mianyang 621000, China) 
  • Online:2024-05-20 Published:2024-05-29

摘要: 植物氮磷含量及其重吸收特征是揭示林木养分利用策略的有效途径。然而,目前关于不同树种枝、叶氮磷含量及其重吸收特征的研究结果尚不明确。为探究不同树种枝、叶氮磷化学计量及其重吸收效率的变化规律,以亚热带同质园中大叶樟(Cinnamomum platyphyllum)、油樟(C. longepaniculatum)、香樟(C. camphora)、香椿(Toona sinensis)、红椿(T. ciliate)、天竺桂(C. japonicum) 和桤木(Alnus cremastogyne) 7种阔叶树种人工林为研究对象,采集其枝、叶(成熟、凋落) 样品,测定氮、磷含量,计算重吸收效率。结果表明:(1)桤木成熟(6.35 g/kg) 和凋落枝(5.38 g/kg) 氮含量显著高于其他树种,但其磷含量则相反,而红椿、香椿、桤木成熟(20.02~23.21 g/kg; 1.59~2.75 g/kg) 和凋落叶(17.69~21.43 g/kg; 1.12~1.95 g/kg) 氮、磷含量整体高于其他树种。香樟、油樟成熟叶以及桤木凋落枝、叶氮磷比均显著高于其他树种,且树种枝叶氮磷比均 < 14,表明该区物种主要受到氮限制。(2) 成熟叶氮磷元素的异速指数为0.744,符合氮磷计量关系的2/3法则,但成熟枝和凋落枝、叶则不符合。相较于成熟枝、叶,凋落枝、叶的氮元素变异性更大,但其磷元素则相反。(3) 落叶树种桤木、红椿和香椿枝、叶氮重吸收效率均显著低于其他树种(香椿枝除外) ,但其枝、叶磷重吸收效率整体高于其他树种(桤木枝除外)。(4) 叶片氮磷化学计量主要受林分特征和土壤理化性质的共同影响,而枝主要受土壤理化性质的影响。研究结果表明,相较于其他乡土树种,选择桤木和红椿等落叶树种作为人工混交林的改造树种,可能更有利于提升亚热带人工林的质量。

Abstract: Assessing the nitrogen (N) and phosphorus (P) contents, as well as the reabsorption characteristics of plants, proves to be a valuable approach for unveiling nutrient utilization strategies in forest trees. However, previous work on this topic is still very limited.  To address this knowledge gap, we selected seven broad-leaved tree species plantations as research objects in a subtropical homogeneous garden, including Cinnamomum platyphyllum, C.longepaniculatum, C.camphora, Toona sinensis, T.ciliate, C.japonicum and Alnus cremastogyne. We collected samples of branches and leaves in green and senescent, to determine the N and P contents and calculated reabsorption efficiency. The results showed that: (1) The N and P contents in the green leaves and senescent leaves of T. ciliate, Toona sinensis, and Alnus cremastogyne were generally higher than those in other tree species. Conversely, the N content in the green branches and senescent branches of Alnus cremastogyne was significantly higher than that of other tree species, while its P content exhibited the opposite trend. All tree branches and leaves had ratios less than 14, indicating that N was the primary limiting nutrient for the species in this area. (2) The green leaf N-to-P allometric index was 0.744, following the 2/3 rule of N-P stoichiometry, while the green branches and senescent branches and leaves deviated from this pattern. Compared to green branches and leaves, N elements in senescent branches and leaves exhibited greater variability, while their P elements followed an opposing trend. (3) The N reabsorption efficiency in branches and leaves of Alnus cremastogyne, T. ciliate and Toona sinensis was significantly lower than that of other trees (with the exception of Toona sinensis branches). Conversely, the P reabsorption efficiency in branches and leaves was higher overall compared to other trees (except for Alnus cremastogyne branches). (4) The N-to-P stoichiometry in leaves was primarily influenced by a combination of tree characteristics and soil physicochemical properties, whereas branches were  mainly affected by soil physicochemical properties. Our findings suggested that, in comparison to other native tree species, the deciduous varieties such as Alnus cremastogyne and T. ciliate be selected as reforestation species for mixed artificial forests to enhance the quality of subtropical artificial forests.

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