The effects of litter accumulation through succession on seed bank formation for small- and large-seeded species
The effects of litter accumulation through succession on seed bank formation for small- and large-seeded species
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DOI：
10.1111/jvs.12037
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发表时间：
2013-11-01
影响因子：
2.8
通讯作者：
Tsuyuzaki, Shiro
中科院分区：
文献类型：
--
作者：
Egawa, Chika;Tsuyuzaki, Shiro
演替过程中凋落物的积累如何影响次级种子传播和埋藏种子的活力，从而控制小种子和大种子物种种子库的形成？地点日本北方一片开采后的泥炭地（45度06 N，141度42 E），其中植物群落演替的时间顺序是已知的。MethodsThe运动的种子后，达到地面和可行的种子可能有助于种子库的形成在不同的深度的可用性进行了实验研究为1年，在四个物种，产生不同大小的种子：圆叶茅膏菜（种子质量0.01mg）、无柄半边莲（0.25mg）、白喙壳（0.87mg）和日本毛蕨（1.82mg）。实验进行了3个演替阶段与0，4-和9-cm厚的凋落物layers.ResultsSeed迁出减少和种子滞留增加凋落物厚度的增加。在整个实验期间，大的种子被保留在垃圾中，和更少的种子被埋在泥炭相比，小的种子被厚厚的垃圾，这已经向下转移到下面的早春。凋落物有助于增加有活力和未发芽种子的数量。在裸露的泥炭表面上，所有物种的存活种子数量几乎为零。泥炭表面上和下的有活力的种子的数量增加，增加凋落物覆盖thickness.ConclusionsThe格局的二次种子传播和可用性的有活力的种子被改变凋落物积累通过演替的进展。此外，凋落物对种子的影响因种子大小不同而异。总的来说，我们的研究结果表明，凋落物厚度的时间变化，通过演替的进展可以发挥重要作用，种子库的形成，这对植物种群和整个社区的长期动态具有潜在的影响。
QuestionsHow does litter accumulation through succession affect secondary seed dispersal and buried seed viability and consequently control seed bank formation for small- and large-seeded species?LocationA post-mined peatland in northern Japan (45 degrees 06N, 141 degrees 42E) where the chronological sequence of plant community succession is known.MethodsThe movements of seeds after reaching the ground surface and the availability of viable seeds potentially contributing to seed bank formation at various depths were experimentally investigated for 1yr in four species that produce different-sized seeds: Drosera rotundifolia (seed mass 0.01mg), Lobelia sessilifolia (0.25mg), Rhynchospora alba (0.87mg) and Moliniopsis japonica (1.82mg). The experiments were conducted in three successional stages with 0-, 4- and 9-cm thick litter layers.ResultsSeed emigration decreased and seed retention increased with an increase in litter thickness. Large seeds were retained within the litter throughout the experimental period, and fewer seeds were buried in peat compared to small seeds trapped by thick litter, which had shifted downward by the following early spring. Litter contributed to increasing the number of viable and ungerminated seeds. The number of viable seeds for all species was nearly zero on the bare peat surface. The numbers of viable seeds on and beneath the peat surface increased with increases in litter cover thickness.ConclusionsThe patterns of secondary seed dispersal and the availability of viable seeds were altered by litter accumulation through the progress of succession. Moreover, the effects of litter on seeds varied among species for which seed size differed. Overall, our results suggest that temporal changes in litter thickness through the progress of succession can play an important role in seed bank formation, which has potential impacts on the long-term dynamics of plant populations and the whole community.