Structural dynamics of a natural mixed deciduous forest in western Thailand
Structural dynamics of a natural mixed deciduous forest in western Thailand
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DOI：
10.2307/3237302
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发表时间：
1999-12-01
影响因子：
2.8
通讯作者：
Nakashisuka, T
中科院分区：
文献类型：
--
作者：
Marod, D;Kutintara, U;Nakashisuka, T
在泰国西部坎恰纳布里省的Mae Klong流域研究站，对天然热带季节性落叶混交林的结构动态进行了为期4年的研究，特别提到了森林火灾和林下竹林的作用。从1992年到1996年，在200 m × 200 m的永久样地中每两年对所有> 5 cm胸径的树木进行一次普查。该森林的特点是低的树干密度和断面积和相对较高的物种多样性。竹类林下植被和频繁的林鳍是阻碍持续更新的主要因素。在4年中，林分的补充率、死亡率、增加量（成活树生长量加向内生长量）和断面积损失量（死亡树）分别为6.70%/年、2.91%/年、1.22%/年和1.34%/年。死亡率是大小相关的;中等大小的树木（30-50厘米）的死亡率最低，而最小的（5-10厘米）的死亡率最高。树木补充观察特别是在头两年，主要是在该地区的林下竹枯死发生。补充量的空间分布对枯梢面积的偏向性显著强于对林隙的偏向性。在竹子枯死后与其他草本植物和树木的竞争中幸存下来的树木，如果随后几年没有发生重复的森林火灾，就可以成功地再生。这表明，火干扰制度和竹子的生活史极大地影响这一季节性热带森林的结构和动态。
Structural dynamics of a natural tropical seasonal mixed deciduous - forest were studied over a 4-yr period at Mae Klong Watershed Research Station, Kanchanaburi Province, western Thailand, with particular reference to the role of forest fires and undergrowth bamboos. All trees > 5 cm DBH in a permanent plot of 200 m x 200 m were censused every two years from 1992 to 1996. The forest was characterized by a low stem density and basal area and relatively high species diversity. Both the bamboo undergrowth and frequent forest fins could be dominant factors that prevent continuous regeneration. Recruitment, mortality, gain (growth of survival tree plus ingrowth) and loss in basal area (by tree death) during the four years were 6.70%/yr, 2.91%/yr, 1.22%/yr and 1.34%/yr, respectively. Mortality was size dependent; middle size trees (30-50 cm) had the lowest mortality, while the smallest (5-10 cm) had the highest mortality. Tree recruitment was observed particularly in the first two years, mostly in the area where dieback of undergrowth bamboo occurred. The bias of the spatial distribution of recruitment to the area of bamboo die-back was significant and stronger than that to the forest canopy gaps. Successful regeneration of trees which survive competition with other herbs and trees after dieback of bamboo could occur when repeated forest fires did not occur in subsequent years. It is suggested that both the fire disturbance regime and bamboo life-cycle greatly influence the structure and dynamics of this seasonal tropical forest.