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Relationship between Plant Weight and Density in Mixed Populations of Medicago Sativa and Trifolium Pratense

Claes Malmberg and Henrik Smith
Oikos
Vol. 38, No. 3 (May, 1982), pp. 365-368
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3544678
Stable URL: http://www.jstor.org/stable/3544678
Page Count: 4
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Relationship between Plant Weight and Density in Mixed Populations of Medicago Sativa and Trifolium Pratense
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Abstract

Seeds of Trifolium pratense L. and Medicago sativa L. were sown in equal proportions in mixtures at high densities. 1. Thinning started earlier in T. pratense but in both species, after thinning commenced, it proceeded at the same rate. 2. Both species underwent collective self-thinning in accordance with the -3/2 power law of Yoda et al. 3. The two species considered separately both underwent thinning in accordance with the -3/2 power law but although the slopes for the two species were the same the intercepts differed strongly. Plants of Medicago sativa, of a given weight, could persist in the mixture at higher densities than plants of Trifolium pratense. /// Семена Trifolium pratense L. и Medicago sativa L. были посеяны в равных пропорциях в смеси и с высокой плотностью. I. Изреживание раньше начинается у T. pratense и у обоих видов после начала изреживания оно протекает с одинаковой скоростыо. II. Оба вида претерпевают общий процесс самоизреживания в соответствии с правилом степенной зависимости - 3/2. III. Оба вида, рассматриваемые по-отдельности, претерпевают самоизреживание также по правилу степенной зависимости - 3/2, но, хотя наклон кривых для обоих видов отдельные их отрезки сильно различаются. Растения Medicago sativa определенного веса могут существовать в смеси в более высокой плотности, чем растения T. pratense.

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