Two kinds of persistent soil seed banks in an amphi-basicarpic cold-desert annual
Two kinds of persistent soil seed banks in an amphi-basicarpic cold-desert annual
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DOI：
10.1017/s0960258514000270
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发表时间：
2014-09
影响因子：
2.1
通讯作者：
Juanjuan Lu;D. Tan;J. Baskin;C. Baskin
中科院分区：
文献类型：
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作者：
Juanjuan Lu;D. Tan;J. Baskin;C. Baskin
摘要国内外对异形种不同形态的种子库进行了比较研究，但没有一个是在双基异形种上进行的。我们的主要目的是比较气生和基生繁殖体形成种子库的相对能力。对生长在中国西北准噶尔沙漠的寒地一年生沙生Ceratocarpus arenarius的3个种群的基生和气生扩散孢子的种子库动态进行了比较。一项为期2.5年的实验花园研究比较了基础（a）和空中（c和f）形态的发芽物候和生存力保留。空中形态形成了修改后的汤普森和尘垢III型种子库（小比例的种子结转到明年）和基础形态修改后的IV型种子库（大比例的种子结转到明年）。种子仅在春季萌发，累积发芽率为f>c>a（第1年），f = c>a（第2年）和f = c = a（第3年）。萌发期长短、埋藏期间生活力保持率与形成持久种子库相对能力的关系为基部型>气生型。本研究结果表明，该种库具有较好的利用价值。arenarius与先前发表的关于本种种子传播和休眠的研究结果完全一致。因此，强有力的额外支持，高风险-低风险发芽策略，在这个寒冷的沙漠一年生植物。
Abstract Several studies have compared seed banks of the different morphs of heteromorphic species, but none of them was on an amphi-basicarpic species. Our primary aim was to compare the relative ability of aerial and basal diaspores of an amphi-basicarpic species to form a seed bank. We compared the seed-bank dynamics of basal and aerial diaspores of three populations of the cold-desert annual Ceratocarpus arenarius growing in the Junggar Desert in north-western China. A 2.5-year experimental garden study compared germination phenology and retention of viability in basal (a) and aerial (c and f) morphs. Aerial morphs formed a modified Thompson and Grime type III seed bank (small proportion of seeds carried over to next year) and the basal morph a modified type IV seed bank (large proportion of seeds carried over to next year). Seeds germinated only in spring, and cumulative germination percentages were f>c>a (year 1), f = c>a (year 2) and f = c = a (year 3). The relationship between length of germination period, retention of viability during burial and relative ability to form a persistent seed bank was basal morph > aerial morphs. The results of this seed-bank study on C. arenarius are in full agreement with those published previously on seed dispersal and dormancy in this species. Thus, strong additional support is provided for a high risk–low risk germination strategy in this cold-desert annual.