Polo-Ávila Alejandro, Infante-Izquierdo María D, Sánchez-Gullón Enrique, Castillo Jesús M, Muñoz-Rodríguez Adolfo F
Departamento de Ciencias Integradas, Fuerzas Armadas Ave., Campus El Carmen, Universidad de Huelva, 21071 Huelva, Spain.
Paraje Natural Marismas del Odiel, Ctra. del Dique Juan Carlos I, Ap. 720, 21071 Huelva, Spain.
Plants (Basel). 2022 Jun 24;11(13):1676. doi: 10.3390/plants11131676.
Halophyte species growing under stressful conditions, such as the annual species of the genus, have been recognized as a source of metabolites of pharmacological and nutraceutical interest. Therefore, planning the extraction of individual plants from wild populations in a sustainable way is especially important in the case of annual species. We studied the environmental matrix and population dynamic of four populations growing at two elevations in salt pans under a Mediterranean climate. In elevated areas, populations presented maximum plant densities of between 628-6288 plants m that remained almost constant until fruiting. In contrast, populations in depressed zones presented five-times greater soil-seed-bank densities and maximum plant densities than populations in elevated zones. In this context, populations in depressed zones lost c. 60% of their maximum plant densities from the end of spring and through summer. In whatever way the environmental matrix seemed to control the population dynamic of in depressed zones, the effects of a stressful environment would interact with plant densities. In this sense, we recorded the density-dependent mortality for the densest population (max. 51,558 plants m). Our results are useful for planning a sustainable harvesting of natural populations of .
生长在诸如该属一年生植物等胁迫条件下的盐生植物物种，已被公认为是具有药理学和营养保健价值的代谢产物来源。因此，对于一年生植物而言，以可持续方式规划从野生种群中提取单株植物尤为重要。我们研究了地中海气候下盐沼中两个海拔高度生长的四个种群的环境基质和种群动态。在海拔较高地区，种群的最大植株密度为每平方米628 - 6288株，直至结果期几乎保持恒定。相比之下，低洼地区的种群土壤种子库密度和最大植株密度比高海拔地区的种群高出五倍。在此背景下，低洼地区的种群从春末到夏季期间，其最大植株密度损失了约60%。无论环境基质以何种方式控制低洼地区的种群动态，胁迫环境的影响都会与植株密度相互作用。从这个意义上说，我们记录了密度最大的种群（每平方米最多51,558株）的密度依赖性死亡率。我们的研究结果有助于规划对该植物自然种群的可持续采收。
