Spatial and temporal variations of landscape pattern in the northern of Qinghai Lake -taking the Gangcha county as an example

As the remote sensing image for information source, by using the methods of landscape index, from the county scale in north Qinghai Lake, to engage in the spatial-temporal analysis for the landscape change during 2000–2007. The result showed that: the degree of landscape fragmentation in north Qinghai Lake increased clearly in nearly 10 years, the separable degree had an upward tendency. The human activity is the main reason for the spatial and temporal variation.