Survival of seedling cohorts of a tropical legume on a sand dune system along the Gulf of Mexico: influence of germination date
Survival of seedling cohorts of a tropical legume on a sand dune system along the Gulf of Mexico: influence of germination date
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墨西哥湾沙丘系统中热带豆科植物幼苗的存活：发芽日期的影响
DOI：
10.1139/b93-172
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发表时间：
1993
期刊：
影响因子：
1.1
通讯作者：
P. Moreno‐Casasola
中科院分区：
文献类型：
--
作者：
M. L. Martínez;P. Moreno‐Casasola
Chamaecrista chamaecristoides是墨西哥沿着海岸沙丘特有的豆科植物。种子的硬壳休眠通过自然发生的温度波动被打破，幼苗可以全年出现并建立。在研究地点，冬季风暴（称为Nortes）是移动大量沙子掩埋幼苗的原因。研究的目的是（i）阐明出苗的时间，（ii）调查出苗日期对幼苗存活的影响，以及（iii）评估死亡率的不同因素。1988年1月至1991年4月，在自然条件下监测幼苗存活情况。使用对数秩Peto和Peto检验比较生存曲线。结果发现，生存或繁殖的概率并不严格取决于实际年龄，而是取决于大小。较大的幼苗在北方存活得更好。萌发时间对C. chamaecristoides populations，s.
Chamaecrista chamaecristoides is a legume endemic to the coastal sand dunes along the coasts of Mexico. Hard-coat dormancy of seeds is broken through naturally occurring temperature fluctuations, and seedlings can emerge and establish throughout the year. In the study site, winter storms (called Nortes) are responsible for moving large quantities of sand that bury young seedlings. The objectives of the study were (i) to elucidate the timing of seedling emergence, (ii) to investigate the effect of date of emergence on seedling survival, and (iii) to evaluate different factors of mortality. Seedling survival was monitored under natural conditions, from January 1988 to April 1991. Survivorship curves were compared using the log-rank Peto and Peto test. It was found that the probability of survival or reproduction was not strictly determined by chronological age but by size. Larger sized seedlings survived better during the Nortes. Timing of germination has a great impact on C. chamaecristoides populations, s...