Study On The Vegetation Landscape Spatial Pattern And Temporal Dynamics Of Wenyuhe Watershed In Guandi Mountain Forest Region

Based on widely investigation of the background information in Wenyuhe Watershed Guandishan Forest Region, using three stages of air-photo imagery since 1980(part of 1982), depended on the topographic map in proportion 1:50000 and supplemented by historical forest map and diagram and forest management, land employment and so on. Three stages vegetation landscape patch mosaic maps of study area are drawn and edited as basic data source for the project. Supported by applied Geographical Information Systems (GIS)-"Geoway"and relative database managed systems. Three levels analytic indexes are taken out respectively (patch level, patch type level and landscape level). The landscape total characteristics, landscape patch element constitute structure, landscape patch element scale, landscape patch element shape, landscape heterogeneity and their dynamics were analyzed and compared. The results showed that: among the 11 types of the vegetation landscape, forest predominates among the whole watershed vegetation landscape pattern, especially the temperate coniferous forest ;open forest, brush and thin brush also play a major role in the vegetation landscape; farmland covers to a large extent; villages and corridor (river and road) are two special types in the watershed; slash and artificial plantation and others are extremely limited all the time and the riparian vegetation and riparian forest are extremely scarce .The succession capacity and restoration potentiality of the whole vegetation in the watershed are formidable, brush and open forest are two important vegetation type in the course of vegetation restoration. As a pioneer species, the broad-leaved forest plays an important role in forest restoration and expansion. Human's activities mainly focusing on the both sides of the corridor and bank along the river seriously hinder the natural succession process of the secondary forest in wenyuhe watershed. The villages and farmland which increasingly scatter on the corridor take the driver's seat in controlling the fragmentation of landscape and the transmission of anthracic interference in the whole watershed. The whole watershed, under extensive management, succession naturally with seriously interference and presents the dynamic pattern that the human's interference to the vegetation of the watershed is strengthening. Based on the analysis, according to the problems existing in the vegetation landscape of this watershed, the whole designs of watershed protection and construction are proposed. That is to say, in the zone of upriver and high elevation, we should protect...