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Analysis on agro-ecological landscape pattern in Phaeozem land area in Northeast China

The spatial structure of landscape is the result of complicated interaction among nature conditions, living organisms and human activities, which changes reflect the interrelationship among them. With remote sensing (RS) images in the same season of different years, we can get the generalized and visualized information of landscape and its changes. With the help of Geographic Information System (GIS) software and RS image processing software, we interpreted the images and quantified the information of the landscape and its changes. By overlaying the land-use maps, we identified the location of changes and conversion between different land-use types. Phaeozem (black soil) is the main type of cultivated soil, distributed in the shape of belt in the mesa and terrace in the east of Songnen Plain in Northeast China, Phaeozem is rich in organic matters and very fertile, and the reclamation rate is high, which makes Songnen Plain be the main commodities food base, and contribute a lot to the social and economical development of Northeast China and even the whole country. The continuous reclamation for the forest land and grassland to the cultivated land made the landscape simplify, and expansion of the cities and transportation makes the space for the agriculture development limited, since "market economy" implemented at the beginning in 20th century, the comparative profit of paddy field and dry land drives the conversion to paddy field.