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Construction costs, payback times, and the leaf economics of carnivorous plants

机译:食肉植物的建设成本,投资回收期和叶片经济性

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Understanding how different plant species and functional types "invest" carbon and nutrients is a major goal of plant ecologists. Two measures of such investments are "construction costs" (carbon needed to produce each gram of tissue) and associated "payback times" for photosynthesis to recover construction costs. These measurements integrate among traits used to assess leaf-trait scaling relationships. Carnivorous plants are model systems for examining mechanisms of leaf-trait coordination, but no studies have measured simultaneously construction costs of carnivorous traps and their photosynthetic rates to determine payback times of traps. We measured mass-based construction costs (CCmass) and photosynthesis (Amass) for traps, leaves, roots, and rhizomes of 15 carnivorous plant species grown under greenhouse conditions. There were highly significant differences among species in CCmass for each structure. Mean CCmass of carnivorous traps (1.14 ± 0.24 g glucose/g dry mass) was significantly lower than CCmass of leaves of 267 noncarnivorous plant species (1.47 ± 0.17), but all carnivorous plants examined had very low Amass and thus, long payback times (495–1551 h). Our results provide the first clear estimates of the marginal benefits of botanical carnivory and place carnivorous plants at the "slow and tough" end of the universal spectrum of leaf traits.
机译:了解不同的植物种类和功能类型 “投资”碳和养分是植物生态学家的主要目标。 这种投资的两种方法是“建设成本”(carbon 需要产生每克组织)和相关的“投资回报期”,以进行光合作用以收回建设成本。这些 测量方法整合了用于评估叶性状 比例关系的性状。食肉植物是用于研究叶片性状协调机制的模型系统,但没有研究同时测量食肉植物的陷阱成本及其光合速率。确定陷阱的投资回收期 。我们测量了圈套,叶子,根和根茎的基于质量的建筑成本(CC mass 和光合作用(A mass 是在温室条件下生长的15种食肉植物物种。 每种结构的CC mass 物种之间存在极显着差异。肉食陷阱的平均CC 质量(1.14± 0.24 g葡萄糖/ g干重)显着低于CC 质量 267种非食肉植物物种的叶片(1.47± 0.17),但是所有被检食的食肉植物的A mass 都非常低,因此回收期长时间(495–1551小时)。我们的结果 提供了对 植物肉食动物的边际收益的第一个清晰估计,并将食肉植物置于普遍的“慢速 和强壮”末端性状的光谱。

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