Rapid burial has differential effects on germination and emergence of small- and large-seeded herbaceous plant species
Rapid burial has differential effects on germination and emergence of small- and large-seeded herbaceous plant species
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DOI：
10.1017/s0960258510000127
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发表时间：
2010-09-01
影响因子：
2.1
通讯作者：
Eckstein, R. Lutz
中科院分区：
文献类型：
--
作者：
Burmeier, Sandra;Donath, Tobias W.;Eckstein, R. Lutz
许多植物种群的动态基本上取决于种子和幼苗阶段，一个持久的种子库可能会给物种一个机会，随着时间的推移分散。种子埋藏是持久性的决定性前奏，并可能强烈影响种子库动态。埋藏的种子的命运取决于物种的特定特征、环境条件，也可能取决于埋藏方式。通过设置埋藏深度（0、1、2、4、8、12 cm）和基质类型（砂、粘土），研究了与水涝草甸共生的草本植物南芥（Arabis nemorensis）、猪殃殃（Galium lutgenii）、旋覆花（Inula salicina）、地榆（Sanguisorba officinalis）和芹叶（Selinum carvifolia）的种子萌发、出苗和生长情况。增加埋藏深度导致降低发芽，出苗和生长在所有研究的物种，和幼苗生长差异显着的基质类型。物种的反应不同的个体基础上，但也表现出较高的排名模式的基础上种子大小。种子较大的物种能够从更深的地方出现，经历了更少的深度介导的生长抑制比种子较小的物种，这反过来又有较高的存活率在埋葬过程中，不太可能经历致命的发芽。基于这些结果，我们认为，草本洪泛草甸物种已经开发了两种不同的种子大小为基础的战略，以应对极端招聘条件下，洪泛草甸，平衡似乎是由干扰事件维持。
The dynamics of many plant populations essentially depend upon seed and seedling stages, and a persistent seed bank may give species an opportunity to disperse through time. Seed burial is a decisive prelude to persistence and may strongly influence seed-bank dynamics. The fate of buried seeds depends on species-specific traits, environmental conditions and possibly also burial mode. We tested seed germination, seedling emergence and growth of the co-occurring herbaceous flood-meadow species Arabis nemorensis, Galium wirtgenii, Inula salicina, Sanguisorba officinalis and Selinum carvifolia in response to the experimental manipulation of burial depth (0, 1, 2, 4, 8, 12 cm) and substrate type (sand, clay). Increasing burial depth led to decreased germination, emergence and growth in all species studied, and seedling growth differed significantly between substrate types. The responses of species differed on an individual basis, but also showed a higher-ranking pattern based on seed size. Larger-seeded species were able to emerge from greater depths and experienced less depth-mediated growth inhibition than smaller-seeded species, which, in turn, had higher survival rates during burial and were less likely to experience fatal germination. Based on these results, we suggest that herbaceous flood-meadow species have developed two different seed-size based strategies for coping with the extreme recruitment conditions prevailing in flood meadows, the balance of which seems to be maintained by disturbance events.