Photosynthetic acclimation and water-use efficiency of three species of understory herbaceous bamboo (Gramineae) in Panama
Photosynthetic acclimation and water-use efficiency of three species of understory herbaceous bamboo (Gramineae) in Panama
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DOI：
10.1007/bf00379897
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发表时间：
1986-11
期刊：
影响因子：
2.7
通讯作者：
S. Mulkey
中科院分区：
文献类型：
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作者：
S. Mulkey
为了评估光合适应的作用，热带林下草本植物的树落光隙的响应，光合响应曲线测定了三种草本竹生长在阳光和阴影的处理在巴罗卡罗拉多岛，巴拿马。光照处理下最大光合能力的提高并不总是伴随着分株产量的提高，宽叶灯塔在两种光照处理下都能大量繁殖，在较高的光照下产生更多的分株，并具有较高的最大光合能力;穗花链毛菌在两种光照处理下都能产生较高比例的生殖分株，在光照下产生更多的分株，不同处理间的光合参数差异不显著，钠黄链毛菌在阳光下的最大光合能力没有变化，在遮荫下具有较高的光合效率和较低的死亡率。叶片稳定碳同位素组成表明，在较高的光照下，三种植物都具有较高的水分利用效率。光合灵活性可能有助于P. latifolius在林隙中繁殖，其中S. spicataandS. sodiroanamae可以保持在低辐照度下有效固定碳的能力，即使当生长或存在于间隙中时。
To assess the role of photosynthetic acclimation in the response of tropical understory herbs to treefall light gaps, photosynthetic response curves were determined for three species of herbaceous bamboo growing in treatments of sun and shade at Barro Calorado Island, Panama. Increased maximum photosynthetic capacity did not always accompany higher ramet production in the sun treatment.Pharus latifoliusreproduced abundantly in both treatments, and produced more ramets and developed higher maximum photosynthetic capacity under higher irradiance.Streptochaeta spicataalso produced a high percentage of reproductive ramets in both treatments and produced more ramets in the sun, did not show any significant differences in photosynthetic parameters between treatments.Streptochaeta sodiroanadid not change maximum photosynthetic capacity in the sun, and had higher photosynthetic efficiency and lower mortality in the shade. Stable carbon isotope composition of leaves indicated that all three species developed higher water-use efficiency under higher irradiance. Photosynthetic flexibility may contribute to the ability ofP. latifoliusto reproduce in treefall gaps, whereasS. spicataandS. sodiroanamay maintain the ability to fix carbon efficiently in low irradiance even when growing or persisting in gaps.