川西北亚高山紫果云杉和岷江冷杉异龄叶性状及养分再吸收

doi:10.16036/j.issn.1000-2650.2019.05.008

摘要/Abstract

摘要： 【目的】叶片是进行光合作用和储存养分的重要器官,其养分再吸收是植物提高养分利用效率和生产力的重要策略之一。因此研究川西北亚高山紫果云杉（Picea purpurea）和岷江冷杉（Abies faxoniana）异龄叶的性状和养分再吸收特征。【方法】2017年10月在四川王朗国家级自然保护区的原始森林中收集紫果云杉和岷江冷杉当年生（1 a）、次年生（2 a）和凋落叶,测量其性状（叶长、叶宽、叶厚和比叶面积）和N、P、K含量。【结果】紫果云杉和岷江冷杉叶片中P、K含量均表现为异龄叶（1 a叶>2 a叶）>凋落叶,且元素含量及其生态计量之间存在极显著差异;物种、叶龄及其交互效应均会极显著影响N、P、K含量及N/K、K/P;紫果云杉和岷江冷杉3种元素再吸收效率均表现为K>P >N,N/P和N/K,说明紫果云杉和岷江冷杉的生长主要受N限制;叶性状在物种和年际间存在明显的差异,但仅比叶面积对紫果云杉叶的养分含量及其P、K再吸收有显著影响。【结论】常绿植物紫果云杉和岷江冷杉异龄叶的性状和养分具有明显差异,叶片养分再吸收是高寒森林适应养分贫瘠的重要策略之一,在将来的亚高山针叶林养分管理中必须对异龄叶予以足够的重视。

关键词: 异龄叶, 营养元素, 生态计量, 养分再吸收, 紫果云杉, 岷江冷杉

Abstract: 【Objective】 Leaf is the main organ for nutrient storage and photosynthesis. Nutrient resorption is one key strategy to improve nutrient use and productivity in plants. The presented study aimed to explore the variations of traits, nutrient concentrations and corresponding stoichiometry in the different- age leaves and new-litter of Picea purpurea and Abies faxoniana, within the primary conifers forest of north-western Sichuan. 【Method】 In the middle Oct. in 2017, the one-year leaves (1 a), the two-years leaves (2 a) and new-litter of Picea purpurea and Abies faxoniana were collected randomly from the upper part of the mature trees of the primary conifers forest of Wanglang National Nature Reserve,north-western Sichuan Province. 【Result】 The leaf P and K contents of Picea purpurea and Abies faxoniana varied largely in different-age leaves (1 a>2 a) >litter leaves, and there were significant differences in element content and their ecological stoichiometry. Species, leaf age and their interaction all significantly affected N, P, K contents and N/K, K/P. The reabsorption efficiency of three elements of Picea purpurea and Abies faxoniana showed K>P>N. N/P and N/K indicated that the growth of Picea purpurea and Abies faxoniana were mainly restrained by N. There were significant differences in leaf traits between species and years, but only specific leaf area had significant effects on nutrient content and P, K reabsorption of Picea purpurea leaves. 【Conclusion】 The study presented the evidence that there are significant differences between of leaf traits and nutrient of the different-age leaves, and foliar nutrient resorption is one key responses of cold forest trees to poor nutrient. Hence, the future nutrient management should pay more attentions on different-age leaves.

Key words: different-age leaves, foliar nutrient elements, stoichiometry, nutrient resorption, Picea pur-purea, Abies faxoniana

中图分类号:

Q948.1

王玉荧, 鲜骏仁, 曾瑞琪, 朱莹莹, 胡建成, 陈国鹏, 马俊. 川西北亚高山紫果云杉和岷江冷杉异龄叶性状及养分再吸收[J]. 四川农业大学学报, 2019, 37(05): 636-643.

WANG Yuying, XIAN Junren, ZENG Ruiqi, ZHU Yingying, HU Jiancheng, CHEN Guopeng, MA Jun. Leaf Traits and Nutrient Reabsorption of Picea purpurea and Abies faxoniana in Subalpine Coniferous Forest, North-Western Sichuan[J]. Journal of Sichuan Agricultural University, 2019, 37(05): 636-643.

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