Recruiting mechanisms of Cylindropuntia leptocaulis (Cactaceae) in the Southern Chihuahuan Desert
Recruiting mechanisms of Cylindropuntia leptocaulis (Cactaceae) in the Southern Chihuahuan Desert
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DOI：
10.1016/j.jaridenv.2012.04.006
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发表时间：
2012-09-01
影响因子：
2.7
通讯作者：
Montana, C.
中科院分区：
文献类型：
--
作者：
Flores-Torres, A.;Montana, C.
有性繁殖和营养繁殖需要建立形态多样的生殖结构（幼苗和茎段）。这项研究评估了两种类型的Leptropuntia leptoortia招聘在两个微环境保护，从草食动物（在开放空间和Larrea tridentata的树冠下）和两种土壤类型（采集自L tridentata树冠下和开放空间）。一项观察研究表明，（仅发现8只幼鱼/公顷），而克隆建立更频繁（59只幼鱼/公顷）;这两种繁殖体都只在灌木冠层下出现，与其他仙人掌属植物一样，但与仙人掌属植物的研究结果相反，种子在保育植物和开放空间下发芽和幼苗存活，但它们在前一种环境中生长得更快。更快的生长在树冠树荫下提供了更好的机会，成功招聘到以后的生命周期阶段。茎段从未在开放空间建立，需要护理植物的阴影。这可能是由于其小体积所施加的生理限制。综合而言，克隆繁殖是C. leptoptoplasticspopulations，and that it takes place地点under下shrub灌木canopy冠. (c)2012爱思唯尔有限公司保留所有权利。
Sexual reproduction and vegetative propagation require the establishment of morphologically diverse reproductive structures (seedlings and stem segments). This study assesses both types of Cylindropuntia leptocaulis recruitment in two microenvironments protected from herbivory (in open space and under the canopy of Larrea tridentata) and with two soil types (collected below L tridentata canopy and from open space).An observational study revealed that sexual establishment was very limited (only 8 juveniles/ha were found), while clonal establishment was more frequent (59 juveniles/ha); both types of propagule were found only under shrub canopy.Field experiments showed that, as in other Cylindropuntia species but contrasting with findings for Opuntia species, seeds germinated and seedlings survived under nurse plants as well as in open space, but they grew faster in the former environment. Faster growth under canopy shade provides better chances of successful recruitment to later life-cycle stages. Stem segments never established in open space, requiring the shade of nurse plants. This may be due to physiological constraints imposed by their small volume. In synthesis, the results indicate that clonal propagation is the most important recruitment mechanism in C. leptocaulis populations, and that it takes places under shrub canopy. (c) 2012 Elsevier Ltd. All rights reserved.