Dynamics of composition and structure in an old Sequoia sempervirens forest
Dynamics of composition and structure in an old Sequoia sempervirens forest
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DOI：
10.1658/1100-9233(2002)013
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发表时间：
2002-12-01
影响因子：
2.8
通讯作者：
Fujimori, T
中科院分区：
文献类型：
--
作者：
Busing, RT;Fujimori, T
利用长期样地资料（1.44 ha）和近期样地资料研究了北加州红杉森林的动态。研究是在冲积平原上的一个古老的林分（100 - 1100年）进行的。近30年来（1972-2001年），乔木层的组成和结构变化不大。红杉在整个时期保持了茎径的广泛分布。红杉的年死亡率（0.0029）和长入率（0.0029）较低，反映了红杉的寿命长和林冠更替缓慢。样带数据还表明，林隙干扰的频率较低（小于或等于每年总土地面积的0.4%），但林隙规模可能很大（< 0.1 ha），林隙面积占比（约20%）与其他温带森林相似。在样带、林隙中心和原木上取样的更新样方显示，红杉在林隙边缘的更新速度加快。红杉的寿命及其对林隙干扰的反应确保了它将在研究林中保持优势种的地位。
Dynamics of a Sequoia sempervirens forest in northern California were studied with long-term plot data (1.44 ha) and recent transect data. The study was conducted in an old stand (> 1100 yr) on alluvial flats. Over three decades (1972-2001), changes in the composition and structure of the tree stratum were minor. Sequoia maintained a broad distribution of stem diameters throughout the period. Annual rates of Sequoia mortality (0.0029) and ingrowth (0.0029) were low, reflecting the great longevity of Sequoia and the slow canopy turnover of the study forest. Transect data also indicated a low frequency of canopy gap disturbance (less than or equal to 0.4% of total land area per yr), but gap size was potentially large (< 0.1 ha) and the fraction of area in gaps (ca. 20%) was similar to other temperate forests. Regeneration quadrats sampled along transects, in gap centers, and on logs revealed that Sequoia regeneration is elevated at gap edges. The longevity of Sequoia and its response to gap disturbances ensure that it will remain a dominant species in the study forest.