A soil seed bank in a mature conifer plantation and establishment of seedlings after clear-cutting in southwest Japan
A soil seed bank in a mature conifer plantation and establishment of seedlings after clear-cutting in southwest Japan
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DOI：
10.1007/s10310-004-0138-3
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发表时间：
2005-08-01
影响因子：
1.5
通讯作者：
Tabuchi, R
中科院分区：
文献类型：
--
作者：
Sakai, A;Sato, S;Tabuchi, R
在日本西南部的一个75岁的针叶树种植园林的成分和空间分布格局的掩埋的活种子，和人口的转变，从掩埋的活种子，以苗皆伐后进行了研究。1997年12月清除了部分种植园，并在一个清除的地点和一个保留的地点建立了研究地块。1998年春季，从表层土壤中采集土壤样品（保留地块共1051个，清除地块共901个），并在温室中培养120天。保存样地中有67种植物的种子埋藏量为1064粒/m2，清除样地中有53种植物的种子埋藏量为1754粒/m2。土壤种子库以低密度种为主，也有少量高密度种，并含有许多底层植被中不存在的先锋种。埋在地下的活种子聚集在一起，特别是在重力传播的物种。尽管土壤中有大量埋在地下的种子，但很少有幼苗出现在森林的地面上。相反，一些幼苗，包括许多先锋物种，出现在清除地块，种子重量和发芽率之间呈正相关。据推测，皆伐后建立的幼苗的优势取决于发芽率和/或幼苗的生长速度，而不是埋在地下的可行的种子的初始密度。这些结果表明，土壤种子库的强大的贡献后，在成熟的针叶种植园干扰次生植被的建立。
Compositions and spatial distribution patterns of buried viable seeds, and demographic transition from buried viable seeds to seedlings after clear-cutting were examined in a 75-year-old conifer plantation in southwest Japan. A part of the plantation was cleared in December 1997 and study plots were set up on a cleared site and a preserved site. Soil samples (a total of 1051 for the preserved plot and 901 for the cleared plot) were collected from surface soils in spring 1998 and were incubated in a greenhouse for 120 days. There were an estimated 1064 buried viable seeds per square meter from 67 species in the preserved plot and 1754 seeds/m(2) from 53 species in the cleared plot. The soil seed bank was from mostly low density species with some high density species, and contained many pioneer species that were absent in the floor vegetation. Buried viable seeds were clumped together, especially in gravity-dispersal species. Although plenty of buried viable seeds were pooled in the soil, few seedlings emerged on the forest floor. In contrast, a number of seedlings, including many pioneer species, emerged in the cleared plots, showing a positive correlation between seed weight and germination rate. It is assumed that dominance of the seedlings established after clear-cutting depends on germination rates and/or growth rates of the seedlings rather than the initial density of buried viable seeds. These results suggest strong contribution of the soil seed bank to the establishment of the secondary vegetation after disturbance in a mature conifer plantation.