CAUSES AND CORRELATES OF INTERANNUAL VARIATION IN FLOWERING OF CALOCHORTUS PLUMMERAE (LILIACEAE)
CAUSES AND CORRELATES OF INTERANNUAL VARIATION IN FLOWERING OF CALOCHORTUS PLUMMERAE (LILIACEAE)
复制标题
百合科植物花期年际变化的原因和相关性
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
C. García
中科院分区：
文献类型：
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作者：
K. Williams;Erica Burck;C. García
摘要金银花是百合科植物，产于美国加利福尼亚州南部的5个县。虽然在大多数年份中很少在花瓣晚期观察到，但它在火灾后盛开花朵。2004年春天，在圣贝纳迪诺的加州州立大学校园里，人们最近在燃烧的茶树上发现了一群羽毛隐翅虫。建立了长期的研究小区，以监测白蜡梅开花的年际变化，并探索这种变化的潜在原因。探讨了年降水量与金银花开花的关系。我们还研究了降水与带叶生长的关系。最后，我们测试了实验草食(剪叶)对当年开花的影响。对开花进行了10年的监测，并对叶片特征(叶片大小和叶对草食的损失)进行了6年的监测。在我们研究的最干旱的一年，没有植物开花，但在潮湿的年份有相当数量的植物开花。在研究最干燥的几年，植物的叶子也变窄了。落叶(试验性地去除大部分带叶)导致不能开花。总体而言，火烧之间的开花似乎受到了减少当年碳增量的因素的抑制：干旱和草食造成的叶片损失。尽管我们关于食草动物的数据太不完整，无法评估其在火灾后几年中驱动开花动态的重要性，但我们研究的其余两个因素(自火灾以来的时间和年降雨量)足以预测每年开花的李属植物的数量。
Abstract Calochortus plummerae Greene (Liliaceae) is a mariposa lily that is restricted to five counties in southern California. Although rarely observed in late seral chaparral during most years, it flowers abundantly after fires. In the spring of 2004, a population of C. plummerae was discovered in recently burned chaparral on the campus of California State University, San Bernardino. Long-term study plots were established to monitor year-to-year variation in flowering of C. plummerae, and to explore potential causes of this variation. We explored the relationship between annual precipitation and flowering of C. plummerae. We also examined the relationship between precipitation and growth of the strap leaf. Finally, we tested effects of experimental herbivory (leaf cutting) on current-year flowering. Flowering was monitored for 10 years, and leaf characteristics (leaf size and leaf loss to herbivory) were monitored for six years. During the driest year of our study, no plants flowered, but a substantial number flowered during wet years. Plants also produced narrower leaves during the driest years of the study. Leaf loss (experimental removal of most of a strap leaf) resulted in failure to flower. Overall, flowering between fires appears to be suppressed by factors that reduce current-year carbon gain: drought and leaf loss to herbivory. Although our data on herbivory were too incomplete to assess its importance in driving the dynamics of flowering in years after fire, the remaining two factors we studied (time since fire and annual rainfall) were sufficient to predict the number of C. plummerae plants that flowered each year.