The Study, Based On The Watershed Landscape Pattern Of Multi-source Data

Watershed, a complex with multi-function, has special processions, such as the movements of water and mineral elements, and is the important regional unit affecting the natural processions and manual actions. The coteau is not only the division of water flow, but also the distinct line of heat, soil types, and biologic types. In a word, the study on the watershed landscape pattern has significances to the development of modern society.Taken the Yanghe Watershed in Qinhuangdao City as a case, this article studies the characters and changes of modern landscape pattern in the scale of watershed. Through the technique of remote sensing and geographic information system, the author achieves the integration of multi-data about watershed landscape, and studies patterns and stabilities of watershed landscape from multi-way, multi-angle and multi-period. On the base of the analysis of pattern indices and type indices, the distribution of the ecological system stability was concluded, and the ecological problems and the factors affecting the problems in the economical development were also analyzed. Thus the study can be the guide to the management of ecological systems and the establishment of economical policies. There are six parts in this article:First: the preface. In this part, the significances of the study on the watershed landscape pattern and the study on landscape pattern were introduced.Second: the generality of the study region. First, the author introduced the definition of the study area-Yanghe Watershed. Second, the characters of nature, society, and economy were introduced. At the end of this part, the ecological problems were analyzed.Third: the theory and method of the article. The theory of heterogeneity and scale is the base of this article. Landscape heterogeneity includes three aspects: special, temporal and the functional. The mainly methods of this article are indices analysis.Fourth: the integration of multi-data. In this part, by the base of watershed, the author achieved the combination of SPOT and Landsat ETM+, remote sensing data and inspect data, remote sensing data and thematic data, remote sensing and statistical data, which composed a database for the study on watershed landscape. At the same time, by using the overlay function of GIS, this article achieved the landscape ecology classification and the automatic calculation of landscape indices. In theselection of landscape indices, the author got ride of the subjectivity in the selection of landscape indices through the Karhunen-Loeve.Fifth: the main and important part. In this part, the author analyses landscape indices and type indices in Yanghe Watershed from 1987 to 2000. Integrating the two type indices, the stability of ecological system in Yanghe Watershed is gained, and the ecological problems in the economical development and the factors bringing to these were analyzed, which was the valid bases for the landscape ecological management.Sixth: the summary and the prospect.The study shows: Remote Sensing (RS) and geographical information system (GIS) are the efficient tools to the study of landscape. And the GIS techniques make the study of pattern and procession of dynamic and special landscape more and more possible. On the base of principle of landscape heterogeneity and landscape scale, this article analyzed the modern landscape pattern in watershed, which makes it more available to explore the main restrained factors in the development of Yanghe watershed and provide foundations for the management of watershed landscape ecological systems.