Low Light Intensity, Inorganic Fertilizer Application and the Leaf Life Span of Quercus acutissima and Q. serrata seedlings (Fagaceae)
Low Light Intensity, Inorganic Fertilizer Application and the Leaf Life Span of Quercus acutissima and Q. serrata seedlings (Fagaceae)
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低光强度、无机肥施用与麻栎和锯缘栎幼苗（壳斗科）叶片寿命
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
A. Saito
中科院分区：
文献类型：
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作者：
G. Banez;K. Gyokusen;A. Saito
从锐齿栎（Quercus acutissima）和枹栎（Q. serrata）幼苗叶片展开到落叶，对其进行观察，以确定低相对光照强度（RLI）和增施无机肥料对叶片寿命（LLS）的影响。在低相对光照强度（25%、12%、6%和3%）下生长的这两种幼苗的叶片保留时间更长，并且随着相对光照强度的降低，叶片寿命显著增加（p<0.01）。尽管已有报道称叶片氮含量与叶片寿命呈负相关（Reich和Waiters，1992），并且有人预测人工增施氮肥会缩短叶片寿命（Rikuzawa，1995），但增施无机肥料并没有显著降低锐齿栎和枹栎幼苗的叶片寿命（p<0.01）。施肥促进了叶片的产生，从而导致了自遮荫。自遮荫可能降低了遮荫叶片的光合速率，使得施肥幼苗的平均叶片寿命比预期的更长。尽管施肥可能提高了光合速率，但自遮荫可能抵消了这种增长。相比之下，在所有处理条件下，锐齿栎的叶片寿命都比枹栎幼苗长。
Leaves of Quercus acutissima and Q. serrata seedlings were observed from the time of unfolding to leaf fall to determine the effects of low relative light intensity (RLI) and additional inorganic fertilizer application to leaf life span (LLS). Seedlings oi both species grown under low RLI (25%, 12%, 6% and 3%) retained leaves longer and the LLS increased significantly (p<0.01) as RLI decreased. Although it has been reported that leaf nitrogen content negatively correlated with LLS (Reich and Waiters, 19921, and it was predicted that the artificial addition of nitrogen would shorten LLS (Rikuzawa, 1995), additional inorganic fertilizer did not decrease the LLS of Q. acutissima and Q. serrata seedlings significantly (p<0.01). Fertilizer application promoted leaf production which led to self shading. Self shading may have reduced photosynthetic rates in shaded leaves extending the mean LLS of fertilized seedlings longer than expected. Although there may have been an increase in photosynthetic rate due to fertilizer application self shading may have offset this increase. Comparatively, Q. acutissima had a longer LLS than Q. serrata seedlings under all treatments.