Response of Asian Rainforest Ecosystems to Global Change

婆罗洲岛的热带雨林支持惊人的生物量，植物生产和树种多样性的快速周转。这种类型的森林生态系统正在经历巨大的人类影响，迅速应对气候和土地使用的变化。因此，为了预测生态系统对气候变化的反应，监测热带雨林的变化过程沿着就显得尤为重要。该计划监测典型的山麓龙脑香混交林，低地石南林，和低地淡水泥炭沼泽森林在西部和中部加里曼丹，文莱。通过对这些森林类型的永久性研究样地的人口和生态系统过程的监测，基于西加里曼丹省Serimbu的龙脑香混交林的人口数据，我们提出了一个描述林隙镶嵌景观中森林结构动态的模拟模型，该模型较好地反映了森林的景观格局。相似模型用于描述不同的森林类型。在Lahei，加里曼丹中部的监测石楠林，表明，茂密的bol-class层的森林相比，混合diprocarp森林是不是由于在这个阶段的增长的抑郁症，但高生长和快速补充，因为抑郁症的营养不良只为冠层阶段的树木。结果表明，石楠林和龙脑香混交林的生物量周转（生物量除以净初级生产量）基本相同，而龙脑香混交林的生物量是石楠林的2倍。树干周长的重复更新有效地记录了产量的暂时变化。1997年厄尔尼诺后生物量增量减少尤为明显。进一步的持续将为我们提供必要的信息，使森林生态系统的功能与环境变化联系起来。

Tropical rain forests in Borneo Island support amazing amount of biomass with fast turnover of phytoproduction and tree species diversity. This type of forest ecosystem is experiencing the immense human impact, responding quickly to changing climate and land use. It is thus particularly important to monitor the changing process of tropical rain forests along the purpose of projecting ecosystem change in response to climatic change. This program monitored typical foothill dipterocarp mixed forest, lowland heath forest, and lowland freshwater peat swamp forest in West and Central Kalimantan, and Brunei. Demographic and ecosystem processes were intensively monitored in permanent research plots set across these forest types.Based on demographic data of mixed dipterocarp forest in Serimbu, West Kalimantan, we proposed a simulation model describing forest structure dynamics in gap-mosaic landscape, that satisfactorily projected the present landscape architecture of forests. Similar model was applied to describe different forest types. The monitored heath forest in Lahei, Central Kalimantan, showed that dense bole-class layer of the forest compared to mixed dipetrocarp forest was not due to the depression of growth at this stage but high upgrowth and rapid recruitment, because the depression by poor nutrient was only for canopy stage trees. As a result, the biomass turnover(biomass divided by net primary production)was just the same between heath forest and mixed dipterocarp forest, which has two times larger biomass. Repeated recensuses of tree trunk girth efficiently recorded temporary variation of production. Reduction of biomass increment after 1997 El Nino was particularly obvious. Further continuation will give us essential information to relate forest ecosystem functioning and environmental change.