The Population Biology of the Genus Viola: I. The Demography of Viola Sororia
The Population Biology of the Genus Viola: I. The Demography of Viola Sororia
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堇菜属的种群生物学：一、堇菜属的人口学
DOI：
10.2307/2259420
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发表时间：
1980
影响因子：
5.5
通讯作者：
D. Kincaid
中科院分区：
文献类型：
--
作者：
O. T. Solbrig;S. Newell;D. Kincaid
(1)在新英格兰的一个森林地点，在8年的时间内定期对1年或更长的紫花地丁的所有植物进行普查。在2年的时间内，同样记录幼苗，并标记20个选择的植物上的每个叶子和生殖结构，并以每周为间隔记录其命运。(2)计算的人口流量，年龄分布，存活率和寿命的1岁或以上的植物，和幼苗。(3)与种群中获得和失去的个体植物数量相比，种群规模的波动很小。有一个非常恒定的年度死亡风险，叠加在一个季节性周期，5月至9月是一个时期的死亡率高于冬季的几个月，当植物不活跃。(4)1年生植株的平均寿命超过10年。虽然幼苗和成年植物表现出Deevey III型死亡率曲线，叶片具有Deevey I型曲线。(5)它还建立了幼苗存活率和生产概率是植物大小的函数，关系是指数的情况下，种子生产。植物个体大小受环境资源竞争的调节。
(1) A census of all plants of Viola sororia 1-yr-old or older was carried out at regular intervals over an 8-yr period in a forest site in New England. Over a 2-yr period seedlings were similarly recorded, and each leaf and reproductive structure on twenty selected plants was marked and its fate recorded at weekly intervals. (2) Calculations were made of population flux, age distribution, survivorship and life expectancy of 1-yr-old or older plants, and of seedlings. (3) Fluctuation in population size was small compared to the number of individual plants gained and lost in the population. There was a remarkably constant annual death risk, superimposed upon a seasonal cycle, May-September being a period of greater mortality than the winter months when the plants were inactive. (4) The life expectancy of a 1-yr-old plant was over 10 yr. While seedlings and adult plants exhibited a Deevey type-III mortality curve, leaves had a Deevey type-I curve. (5) It was also established that seedling survival and production-probability are a function of plant size; the relationship is exponential in the case of seed production. It is suggested that individual plant size is regulated by competition for environmental resources.