INTERSPECIFIC COMPETITION BETWEEN SEEDS - RELATIVE PLANTING DATE AND DENSITY AFFECT SEEDLING EMERGENCE
INTERSPECIFIC COMPETITION BETWEEN SEEDS - RELATIVE PLANTING DATE AND DENSITY AFFECT SEEDLING EMERGENCE
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DOI：
10.2307/1938097
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发表时间：
1989-12-01
期刊：
影响因子：
4.8
通讯作者：
PERRY, R
中科院分区：
文献类型：
--
作者：
BERGELSON, J;PERRY, R
土壤中种子之间的相互作用知之甚少。我们进行了温室实验，以调查种子密度，相对频率，相对种植日期的影响，在物种千里光，荠菜bursa-pastoris，早熟禾出苗。我们发现，对于早熟禾和千里光，出现的概率显着下降，总种子密度的增加。无论是同种的密度还是异种的密度都不能单独解释这种出现概率的下降。我们还发现，对于所研究的所有三个物种，在先前种植的种子存在的情况下，出苗率加快。第二个实验表明，这种加速涉及对先前发芽的种子的渗滤液的反应。
The interactions between seeds in the soil are poorly understood. We performed greenhouse experiments to investigate the effects of seed density, relative frequency, and relative planting date on the emergence of seedlings in the species Senecio vulgaris, Capsella bursa-pastoris, and Poa annua. We found that for both Poa and Senecio, the probability of emergence significantly decreased with an increase in total seed density. Neither the density of conspecifics nor heterspecifics alone could explain this decline in the probability of emergence. We also found that, for all three species studied, the rate of emergence acclerated in the presence of previously planted seeds. A second experiment indicated thta this acceleration involves a response to leachate from previously germinated seeds.