埋藏对两种不同种子大小盐生植物种子萌发和出苗的影响

IF 1.7 4区生物学 Q2 PLANT SCIENCES

Plant Ecology & Diversity Pub Date : 2020-07-03 DOI:10.1080/17550874.2020.1832154

A. M. Abbas, A. Rubio-Casal, A. de Cires, E. Figueroa, A. Pickart, J. Castillo

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引用次数: 4

摘要

背景发芽，尤其是出苗会随着深度的增加而显著减少。目的通过果实性状的对比，研究沙埋深对两种盐生植物密翅雀和马齿苋种子萌发和成苗的影响。方法采用温室试验方法，研究0～6cm埋沙对种子萌发和成苗的影响。在这两个物种最近定居的盐沼中也记录了沉积物侵蚀/吸积动力学。结果两种盐生植物的发芽率在1cm深度处均高于表面，在1cm以下随深度的增加而逐渐下降。两种盐生植物的幼苗在1-3 cm之间的发芽率相似（约为20-60%）。密度S.denciflora在2厘米深度播种的种子和梭子蟹在1到3厘米之间播种的种子的幼苗存活率最高（约100%）。记录的侵蚀和吸积速率足以改变两种盐生植物的发芽和建立模式。结论密花Spartina在更深处的发芽率高于马齿苋，这似乎与其生长形态有关。

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Burial effects on seed germination and seedling emergence of two halophytes of contrasting seed size

ABSTRACT Background Germination and especially emergence can decrease significantly with depth. Aim Our main goal was to examine the effects of sand burial depth on seed germination and seedling establishment of two halophytes, Spartina densiflora and Atriplex portulacoides, with contrasted fruit traits. Methods The effects of sand burial to depths of 0 to 6 cm on seed germination and seedling establishment were studied in a greenhouse experiment. Sediment erosion/accretion dynamics were also recorded at a salt marsh colonised recently by both species. Results Germination percentage for both halophytes was higher at a depth of 1 cm than at the surface, and decreased gradually with increasing depth below 1 cm. Emergence of seedlings was similar between 1 and 3 cm (ca. 20–60 %) for both species. The highest seedling survival rates (ca. 100 %) were recorded for seeds sown at a depth of 2 cm for S. densiflora and between 1 and 3 cm for A. portulacoides. Recorded erosion and accretion rates was large enough to modify germination and establishment patterns in both halophytes. Conclusions Spartina densiflora showed higher germination rates than A. portulacoides at greater depths, which seemed to be related to its growth form.

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来源期刊

Plant Ecology & Diversity PLANT SCIENCES-

CiteScore

3.30

自引率

0.00%

发文量

审稿时长

3 months

期刊介绍： Plant Ecology and Diversity is an international journal for communicating results and novel ideas in plant science, in print and on-line, six times a year. All areas of plant biology relating to ecology, evolution and diversity are of interest, including those which explicitly deal with today''s highly topical themes, such as biodiversity, conservation and global change. We consider submissions that address fundamental questions which are pertinent to contemporary plant science. Articles concerning extreme environments world-wide are particularly welcome. Plant Ecology and Diversity considers for publication original research articles, short communications, reviews, and scientific correspondence that explore thought-provoking ideas. To aid redressing ‘publication bias’ the journal is unique in reporting, in the form of short communications, ‘negative results’ and ‘repeat experiments’ that test ecological theories experimentally, in theoretically flawless and methodologically sound papers. Research reviews and method papers, are also encouraged. Plant Ecology & Diversity publishes high-quality and topical research that demonstrates solid scholarship. As such, the journal does not publish purely descriptive papers. Submissions are required to focus on research topics that are broad in their scope and thus provide new insights and contribute to theory. The original research should address clear hypotheses that test theory or questions and offer new insights on topics of interest to an international readership.