Oasis-desert landscape heterogeneity and spatial scaling of Fukang transect in Xinjiang, China

摘要

Based on aerial images the GIS technique supported by ARC/INFO software was used to analyze the oasis-desert landscape heterogeneity and its dynamics of Fukang transect with spatial scale change, using landscape structural indices to reveal and compare the structural characteristics of oasis-desert landscape heterogeneity, which was useful to study the dynamics process of landscape heterogeneity through time from different aspect in arid area, which was useful to study the dynamics process of landscape heterogeneity. The results show that oasis-desert landscape in studied area was controlled by the combination of environment heterogeneity, human dimension and activities, and natural vegetation succession. The mutation, contrast and heterogeneity of ecological interface between oasis and desert ecosystem increased. Rare natural or non-regional mosaic of patch show obvious sensitivity to spatial scale, the change ratios of theirs area and perimeter are greater than large patch. With the disturbance of moderate scale more small patchiness combines into more large patchiness. But more patchiness of mosaic will vanish with violent disturbances or isolations of scales. At the same time it has proved that the analysis of landscape heterogeneity is quite effective research means in ecology to measure and quantify the relationship, interaction and response between the structure and function, patterns and processes of oasis-desert ecosystem.