van Baalen J
Department of Ecology, Biological Laboratory, Free University, De Boelelaan 1087, 1007 MC, Amsterdam, The Netherlands.
Oecologia. 1982 Apr;53(1):61-67. doi: 10.1007/BF00377137.
The germination ecology and the dynamics of the generative reproduction in populations of Digitalis purpurea L. were investigated in the field as well as in experiments. Germination of fresh seeds in the dark on moist filter paper appeared to differ between populations. These differences were eliminated when a moist natural soil functioned as germination substrate. An interaction between the spectral composition of light and the germination substrate was present. Germination in gradients of light, temperature and soil moisture revealed some clear-cut results. Germination proved to be strongly dependent on the percentage of vegetation cover. During two years of burial in litter bags, the number of buried viable seeds did not decrease. From one generation of seeds produced in a natural population, 18% was introduced into the buried seed bank, 10% germinated in autumn and 24% was present as a enforced dormant surface seed bank in late autumn.The results are discussed in relation to secondary succession. can be derived from Milton (1936), Salisbury (1942) and Thompson and Grime (1979). Soil disturbance and germination seem to be correlated in D. purpurea (Grime 1979). The purpose of this study is to analyse the dormancy and germination behaviour of D. purpurea in relation to the relevant environmental factors in order to explain the mechanisms of entry into, and the escape of D. purpurea seeds from a seed bank. Furthermore, an attempt will be made to quantify seed rain as well as the fate of different germinating and non-germinating seed rain fractions in space and time per unit area, in different stages of succession.
在野外和实验中对毛地黄种群的萌发生态学和有性繁殖动态进行了研究。新鲜种子在黑暗中潮湿滤纸上的萌发情况在不同种群间似乎存在差异。当潮湿的天然土壤作为萌发基质时，这些差异就消失了。光的光谱组成与萌发基质之间存在相互作用。在光照、温度和土壤湿度梯度下的萌发显示出一些明确的结果。萌发被证明强烈依赖于植被覆盖百分比。在垃圾袋中埋藏两年期间，埋藏的有活力种子数量没有减少。在一个自然种群产生的一代种子中，18%进入了埋藏种子库，10%在秋季萌发，24%在深秋作为强制休眠的地表种子库存在。结合次生演替对结果进行了讨论。可参考米尔顿（1936年）、索尔兹伯里（1942年）以及汤普森和格里姆（1979年）的研究。在毛地黄中，土壤干扰和萌发似乎相关（格里姆，1979年）。本研究的目的是分析毛地黄的休眠和萌发行为与相关环境因素的关系，以解释毛地黄种子进入种子库和从种子库逸出的机制。此外，还将尝试量化种子雨以及单位面积内不同萌发和未萌发种子雨组分在不同演替阶段的时空命运。
