THERMAL STRUCTURE OF A MEGADIVERSE ANDEAN MOUNTAIN ECOSYSTEM IN SOUTHERN ECUADOR AND ITS REGIONALIZATION
THERMAL STRUCTURE OF A MEGADIVERSE ANDEAN MOUNTAIN ECOSYSTEM IN SOUTHERN ECUADOR AND ITS REGIONALIZATION
复制标题
DOI：
10.3112/erdkunde.2009.04.03
复制
发表时间：
2009-10-01
期刊：
影响因子：
1.4
通讯作者：
Bendix, Joerg
中科院分区：
文献类型：
--
作者：
Fries, Andreas;Rollenbeck, Ruetger;Bendix, Joerg
根据天然山地森林内和海拔1600至3200米的开阔地带的温度测量，研究了厄瓜多尔南部一个巨大多样的山地生态系统的热结构。本研究的主要方法目标是开发气温区划工具，利用观测数据提供月平均、最低和最高气温的空间数据集。这些地图基于1999-2007年期间的数据，是在没有气候站数据的各种地块上开展的生态项目所需要的。温度图是通过将直接去趋势技术与数字高程模型和基于卫星的土地覆盖分类相结合而生成的，该分类还提供了每像素的相对森林复盖率。这项研究的主要目的是调查我们的生态系统(牧场和自然植被)的两种表现形式的热结构，并特别考虑通过将天然林转化为牧场来提供生态系统温度调节服务。结果表明，这一年的热力差异明显，这部分是由天气形势的变化引起的，也是由土地覆盖的影响引起的。在云量和空气湿度较高的主雨季，热辐射幅度特别低，但在相对干燥的季节，日照照度和夜间辐射输出造成土地覆盖单元之间的明显差异，热幅值明显较大。尤其是天然林砍伐和焚烧获得的低牧场表现出最极端的热条件，而山林内的大气略有凉爽，这是茂密植被调节作用的线索。因此，砍伐森林明显减少了生态系统的热调节功能(调节生态系统服务)，这在未来全球变暖的情况下可能会成为问题。
The thermal structure of a megadiverse mountain ecosystem in southern Ecuador is examined on the basis of temperature measurements inside the natural mountain forest and at open-sites along an altitudinal gradient from 1600 to 3200 m. The main methodological aim of the current study is to develop in air temperature regionalization tool to provide spatial datasets on average monthly mean, minimum and maximum temperature by using observation data. The maps, based on data of the period 1999-2007, are needed by ecological projects working on various plots where no climate station data arc available. The temperature maps arc generated by combining a straight forward detrending technique with a Digital Elevation Model and a satellite-based land cover classification which also provides the relative forest cover per pixel. The topical aim of the study is to investigate the thermal structure Of both manifestations Of Our ecosystem (pastures and natural vegetation) with special considerations to the ecosystem temperature regulation service by converting natural forest into pasture. The results reveal a clear thermal differentiation over the year, partly triggered by the change of synoptic weather situation but also by land cover effects. Thermal amplitudes are particularly low during the main rainy season when cloudiness and air humidity are high, but markedly pronounced in the relative dry season when daily irradiance and Outgoing nocturnal radiation cause distinct differences between the land cover units. Particularly the lower pasture areas gained by slash and burn of the natural forest exhibit the most extreme thermal conditions while the atmosphere inside the mountain forest is slightly cooler clue to the regulating effects of the dense vegetation. Thus, clearing the forest clearly reduces the thermal regulation function (regulating ecosystem services) of the ecosystem which might become Problematic under future global warming.