[Analysis on the dynamics of desert-oasis vegetation in the Sangong River Basin]

Taking the Sangong River Basin as a typical research area, the relationships between the change of landscape pattern of desert-oasis and the dynamics of vegetation were studied in this paper, and the evolution of the landscape pattern of desert-oasis was also discussed. The results showed that the main characteristics of landscape pattern were the dynamics of vegetation. It had the impact on the vegetation by the changes of topography, water resources using, corridor of river and drainage channel. It was shown the great variability for the height, cover and biomass of vegetation with the change of landscape pattern. Taking the corridor of river as the center, it usually showed a zone distribution from inside to outside for the desert-oasis landscape pattern. The vegetation types evolved from the tree-shrub mixed forest, thicket meadow, salinized meadow to desert with the change of the condition of water and heat in the basin. The stability of natural patch was higher than that disturbed by mankind or manmade patch. Usually, the stability of each patch was in order of desert > sandy land > urban > pond > paddy field > grass land > vegetable plot > woodland > residential area > saline-alkali land > wasteland > farming land > orchard. The landscape pattern of desert-oasis in the research area was developed by human activities based on natural oasis.