摘要
尺度推绎作为将一个尺度上的信息推绎到另一个尺度上的过程,具有尺度依赖性、模型非线性和研究的复杂性等特征,其理论基础主要有等级理论、分形理论等,其研究的关键问题表现为尺度选择与信息提取问题、尺度域与特征尺度问题、模型问题等方面。针对相邻尺度推绎和跨尺度推绎两种情况,还介绍了不同情况下尺度推绎研究的基本思路。尺度推绎作为现代地学、生态学等学科研究的重要问题之一,其发展需要多学科的交流和理论与技术的创新。
As one of the key issues in geography and ecology, scaling has been drawing more and more attention, and it's very necessary to grasp its fundamental issues. So, based on the relative articles, this paper dwells on the general issues in scaling, including concept, sorts, characters, basic theories, key problems and study strategies.Scaling is the process of extrapolating or translating information from one scale to another, and the essential characters of which are scale dependency, model nonlinearness and complexity in study, the basic theories are hierarchy theory, fractal theory, etc. From the relative studies on scaling, we can find out there are some key problems in scaling, such as scale selection & information extraction, domains of scale & characteristic scale, modelling, and so on. The study strategies are different in different situations. In the process of extrapolating information across adjacent scales, there are three methods: ①change the model's grain, extent or both directly;②modify the model before changing it's grain and extent.③based on the mutual relations of the background factors in different scales. As for the cases of extrapolating information across a wide range of scales, what we can do is to study one scale after another and get the last scale information from all the other scales' information. For the future of scaling, we need common communication among subjects and innovations in theories and technologies.
出处
《地球科学进展》
CAS
CSCD
2002年第6期905-911,共7页
Advances in Earth Science
基金
国家自然科学基金重点项目"黄土丘陵沟壑区景观格局演变与水土流失机理"(编号:90102018)资助.
