Landscape Dynamics and Vegetation Cover Seasonal Response in Loess Plateau of Northern Shaanxi
陕北黄土高原景观动态的植被覆盖季节响应

The ecological condition is closely linked with landscape dynamics in the semi-arid area. In order to discuss ecological response of landscape dynamics, this paper chooses Loess Plateau of northern Shaanxi as a study area and analyses the relationship between Normalized Difference Vegetation Index (NDVI) time series of one year and landscape dynamics that consist of various landscape types and the components of landscape types. The result of NDVI estimation is obtained based on smooth curve characteristics such as growing season, peak season, the length of NDVI high period and low period, and maximum or minimum values.Spatial analysis methods can be used to obtain the distribution of landscape change. However, it is not enough to understand the interaction of landscape dynamics and regional ecological response. So we need to further study landscape dynamics by enhancing its resolution. Because the varieties of landscape types are not distinct enough to define in the study area, the study attempted to quantify the relationship between the components of landscape types and NDVI. According to the correlation analysis, we found that the curve style and relativity of NDVI and landscape are complex, landscape types could respond to the degree of NDVI at regional scale, but that also needs to integrate landscape dynamic types in drainage scale. In order to optimize landscape pattern by understanding the characteristics of landscape pattern and dynamics in the Loess Plateau exactly and its ecological response, this paper suggests enhancing basic data definition in temporal and spatial scales.