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Scientific evaluation of the tropical rainforests resources in Africa using field investigation and satellite data

利用实地调查和卫星数据对非洲热带雨林资源进行科学评估

基本信息

批准号：
07680553
负责人：
SANGA-NGOIE Kazadi
金额：
$ 1.54万
依托单位：
MIE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

This research was performed focusing on field investigations over the tropical rainforest region in Africa, especially the Zaire River Basin, so as to create a scientific ecoclimatological database for the analysis of the seasonal, inter-annual and long-term changes in both the rainforest ecosystem and the climatological parameters (rainfall, temperature, vegatation cover, etc.) over this region.Suffices to point here the main new findings from our analyzes over this tropical rainforest region and the surrounding savanna woodland and grassland areas : 1. The existence of a remarkable 2-to 5-year oscillation in the temperature data, with strong positive correlationship with the Southern Oscillation Index (SOI), and therefore the ENSO.2. An omnipresent quasi-decadal oscillation (QDO) in the temperature, humidity and rainfalls records, with a periodicity matching that of the solar activity (sunspot numbers). 3. A persistent warming trend observed at all the stations in Zaire, with a mean increase of 0.5 to 1.5ﾟC over the 1960-90 period : this is more than the values observed for the global warming on the same 30-year period. 4. For every analyzed point, a strong desiccation trend, manifested by a strong decrease in rainfalls as well as the lengthening of the dry season (up to 3 months at some stations). 5. The magnitude of these long term trends (warming and desiccation) suggests that these phenomena are regional and imbedded in the change in the local ecoclimatological conditions. The remarkable relationship between these changes and the local people's lifestyle and alteration of the environment for their living (shifting cultivation, bushfire, fuel wood, etc.) has been highlighted.

本研究以非洲热带雨林地区，特别是扎伊尔河流域的实地调查为重点，旨在建立一个科学的生态气候数据库，用于分析热带雨林生态系统的季节、年际和长期变化以及气候参数（降雨、温度、植被覆盖等）。在这里，我们对这个热带雨林地区和周围的稀树草原林地和草原地区的分析得出了主要的新发现：1。温度资料存在显著的2 ~ 5年振荡，与南方涛动指数（SOI）有较强的正相关关系，因此与ENSO也有较强的正相关关系.在温度、湿度和太阳辐射记录中存在一种无所不在的准十年振荡（QDO），其周期性与太阳活动（太阳黑子数）相匹配。3.在扎伊尔的所有观测站都观察到持续变暖的趋势，在1960- 1990年期间平均增加0.5至1.5摄氏度：这比在同一30年期间观察到的全球变暖值要高。4.对于每一个分析点，一个强烈的干燥化趋势，表现为一个强烈的减少，以及旱季的延长（在一些站长达3个月）。5.这些长期趋势（变暖和干燥）的幅度表明，这些现象是区域性的，并嵌入在当地生态气候条件的变化。这些变化与当地人的生活方式和生活环境的改变（轮垦、烧火、薪炭等）有着密切的关系。已经被强调了。