Fire influences reproductive outcomes by modifying flowering phenology and mate‐availability
Fire influences reproductive outcomes by modifying flowering phenology and mate‐availability
复制标题
火灾通过改变开花物候和交配可用性来影响繁殖结果
DOI：
10.1111/nph.17923
复制
发表时间：
2022
期刊：
影响因子：
9.4
通讯作者：
Wagenius, Stuart
中科院分区：
文献类型：
--
作者：
Richardson, Lea K.;Wagenius, Stuart
最近的一项研究认为，草原上的火通过改善交配机会和繁殖结果来促进植物物种的持续存在。我们设计了一项调查，在两种分布广泛、寿命较长的多年生植物中测试这些预测的机制。我们希望火能同步开花，增加交配，促进结实。我们在美国明尼苏达州的一个保护区里量化了三年来石杉和一枝黄花的个体开花物候和种子结实情况。保护区由两个管理单元组成，每隔一年焚烧一次，允许比较同一年内烧毁和未烧毁地区的植物，以及同一地区有烧和不烧的年份的植物。火提高了开花的同步性，并增加了开始日期和开花高峰之间的时间。在季节较晚开始开花的两种植物的个体都有较高的结实率。火与刺梨的开花率和结实率显著提高有关，但与特殊刺参的关系不大。虽然火影响了两个物种的开花物候，但繁殖成功只在火也在年间开花之间同步的物种中提高。我们的结果支持这样的假设，即某些草原物种的繁殖受益于火。
A recent study posited that fire in grasslands promotes persistence of plant species by improving mating opportunities and reproductive outcomes. We devised an investigation to test these predicted mechanisms in two widespread, long‐lived perennials. We expect fire to synchronize flowering, increase mating and boost seed set.We quantified individual flowering phenology and seed set ofLiatris asperaandSolidago speciosafor 3 yr on a preserve in Minnesota, USA. The preserve comprises two management units burned on alternating years, allowing for comparisons between plants in burned and unburned areas within the same year, and plants in the same area across years with and without burns.Fire increased flowering synchrony and increased time between start date and peak flowering. Individuals of both species that initiated flowering later in the season had higher seed set. Fire was associated with substantially higher flowering rates and seed set inL.asperabut notS.speciosa. InL.aspera, greater synchrony was associated with increased mean seed set.Although fire affected flowering phenology in both species, reproductive success improved only in the species in which fire also synchronized among‐year flowering. Our results support the hypothesis that reproduction in some grassland species benefits from fire.