Impact of severe drought associated with the 1997-1998 El Nino in a tropical forest in Sarawak
Impact of severe drought associated with the 1997-1998 El Nino in a tropical forest in Sarawak
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DOI：
10.1017/s0266467400001450
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发表时间：
2000-05-01
影响因子：
1.4
通讯作者：
Seng, LH
中科院分区：
文献类型：
--
作者：
Nakagawa, M;Tanaka, K;Seng, LH
检查了与1997 - 1998年的El Nino相关的异常严重的干旱对马来西亚砂拉越的热带森林动态的影响。在核心地块（1.38 ha）中非干旱期（1993-1997）的死亡率为0.89％y（-1），而在同一地块中的干旱期（1997-1998）中的死亡率为6.37和4.35％y（-1）。干旱间隔损失的基础面积是1993 - 1997年年度增量基础面积的3.4倍。对于较小的树木而言，干旱死亡率更高，尽管它的尺寸低于非干旱死亡率。在研究地块中是主要家族的双翅目科的死亡率比非干旱时期高12-30倍。地形类型之间的死亡率没有显着差异。从对数线性模型的结果（多因素的应急表）的结果中，树木的死亡与尺寸类别相关，表明森林的尺寸级结构发生了变化。因此，即使在人均热带森林中，物种组成和结构也完全受到这种情节干旱的影响。
The impact of the unusually severe drought associated with the 1997-1998 El Nino on tropical forest dynamics in Sarawak, Malaysia was examined. Mortality during the non-drought period (1993-1997) in a core plot (1.38 ha) was 0.89 % y(-1), while that during the drought period (1997-1998) in the same plot and a peripheral plot was 6.37 and 4.35 % y(-1), respectively. The basal area lost in the drought interval was 3.4 times that of the annual incremental basal area in 1993-1997. Drought mortality was higher for the smaller trees, though it was less size dependent than the non-drought mortality. Dipterocarpaceae, which is the dominant family in the study plot, had a mortality 12-30 times higher in the drought than the non-drought period. There were no significant differences in mortality among the topographic types. From the results of a log-linear model (multi-factored contingency table), the death of trees was correlated with size class, indicating a change in the size-class structure of the forest. Thus, both the species composition and structure are totally affected by such an episodic drought even in a per-humid tropical forest.