Growth and photosynthetic responses of the federally endangered shrub Lindera melissifolia (Lauraceae), to varied light environments
Growth and photosynthetic responses of the federally endangered shrub Lindera melissifolia (Lauraceae), to varied light environments
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DOI：
10.3732/ajb.92.4.682
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发表时间：
2005-04-01
影响因子：
3
通讯作者：
Kirkman, LK
中科院分区：
文献类型：
--
作者：
Aleric, KM;Kirkman, LK
光合作用、形态和生长对光环境的响应可以用来确定保护濒危物种的有利生境条件。为甜菜Lindera melissfolia(Walt.)Blume，我们比较了自然光照和控制光照条件下的形态和光合作用反应，以及三种光照处理下的生长：100%、42%和19%全光照。典型的遮荫形态对光照水平降低的反应包括气孔密度降低、比叶面积增大和叶面积比增大。光合作用能力(3~6mU·m~(-2)个CO_2中心点和S~(-1)中心点)与其它耐荫树种一致。试验植物的光饱和光合作用速率随着光照的增加而增加，在42%的光照下，但在100%的光照下，饱和光合作用速率下降。100%光处理还导致植物生物量降低，这主要是由于根生物量的减少。结果表明，日照40%以下的冠层条件对植物生长最有利，应在该物种的管理和引种工作中加以考虑。
Photosynthetic, morphological, and growth responses to light environment can be useful measurements to determine favorable habitat conditions for the conservation of endangered species. For Lindera melissfolia (Walt.) Blume, we compared morphological and photosynthetic responses under natural and controlled light regimes, and growth under three light treatments: 100%, 42%, and 19% full sunlight. Typical sun-shade morphological responses to decreasing light levels included decreased stomatal density, increased specific leaf area, and increased leaf area ratio. Photosynthetic capacity (3-6 mu mol CO2 center dot m(-2) center dot s(-1)) was consistent with other shade-tolerant species. Light-saturated rates of photosynthesis of experimental plants increased with increasing light up to 42% sunlight, but declined at 100% sunlight. The 100% light treatment also resulted in lower plant biomass, primarily from a reduction in root biomass. Results indicate that canopy conditions at levels below 40% sunlight are optimal for plant growth and should be considered in management and reintroduction efforts for this species.