Vigour of post-fire resprouting by Quercus coccifera L.
Vigour of post-fire resprouting by Quercus coccifera L.
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Quercus coccifera L.火灾后再发芽的活力。
DOI：
10.2307/2260598
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发表时间：
1988
影响因子：
5.5
通讯作者：
L. Trabaud
中科院分区：
文献类型：
--
作者：
G. Malanson;L. Trabaud
(1)在法国南部的红栎上进行了试验，考察了林龄、火灾强度、火灾季节和火灾前冠层结构对再发芽活力的影响。测试了十八种实验治疗组合。自上次火灾以来的三个年龄、三个火灾强度和两个季节合并在一起。每种处理组合在 50 x 50 cm 的地块上重复六次。 (2)将所有植物材料修剪、干燥并称重。 Q. coccifera 被分为基部直径和分支直径的分级大小类别。然后用火焰火把烧毁这些地块。烧伤治疗后八周内记录每个 Q. coccifera 新芽的密度和高度。 (3)不同年龄的地块以及不同持续时间的烧毁之间的效果存在显着差异，但季节是所有分析中的主要变量：5月下旬烧毁后的新芽密度和生长比10月初烧毁后要大得多。除季节外，对再发活力影响最大的是火灾前的冠层结构。火前茎密度以及木质和叶生物量似乎是重要的变量，但高度多重共线性排除了明确的答案。 (4) 通径分析支持再发芽密度受火前茎密度影响最大的假设。这可能表明存在休眠分生组织的储存库。发芽生长受火前生物量值的影响更大，表明地下碳水化合物储备。春季燃烧后发芽更加旺盛，这表明春季生长旺盛后储量更大（与旱季后枯竭的情况相比），或更可能是气温升高和日照增加的直接影响。
(1) Experiments were carried out on Quercus coccifera in southern France to examine the effects of age of stand, fire intensity, fire season, and prefire canopy structure on the vigour of resprouting. Eighteen experimental treatment combinations were tested. Three ages since last fire, three fire intensities, and two seasons were combined. Each treatment combination was repeated six times on plots of 50 x 50 cm. (2) All plant material was clipped, dried, and weighed. Q. coccifera was divided into hierarchical size-classes of basal and branch diameter. The plots were then burned using flame torches. The density and height of each Q. coccifera resprout was recorded through eight weeks following the burn treatments. (3) Significant differences in effect were found between plots of different ages, and between burns of different durations, but season is the dominant variable in all analyses: resprout density and growth are much greater following burning in late May than after burning in early October. Other than season, it is pre-fire canopy structure that most affects resprout vigour. Pre-fire stem density and woody and foliar biomass seem to be important variables, but definitive answers are precluded by high multicollinearity. (4) Path analyses support the hypothesis that resprout density is affected most by prefire stem density. This may indicate a reservoir of dormant meristematic tissue. Resprout growth is more strongly affected by pre-fire biomass value, indicative of underground carbohydrate reserves. More vigorous sprouting follows the spring burn, indicating either greater reserves following the flush of spring growth (compared with depleted condition following the dry season) or, more likely, the direct effect of warmer temperatures and increasing sunshine.