Abstract: By using 1980, 1991, 2001, and 2009 high-resolution (spatial resolution≤1 m) remote sensing images, and selecting dynamic degree, transfer matrix, and landscape pattern metrics as the indices, this paper analyzed the holistic characteristics of landscape change, its rate and transfer flow direction, and pattern characteristics at landscape and class levels in Xinzhuang town of Changshu city. In 1980-2009, the paddy field in the town had a sharp decrease, dry land and water area also decreased, residential land, industrial land, and fish pond kept rapid increase, while the other landscape types changed less. Paddy field was all along the most important “source” of land-use conversion, with the main transfer destination being fish pond, industrial land, and residential land. Before 2001, fish pond and residential land were the “sinks” of the landuse conversion; after 2001, with the rapid rural urbanization and industrialization, construction land gradually became the most important “sink” of landuse conversion, and the contribution of industrial land and residential land increased. At landscape level, the fragmentation and heterogeneity increased, dominance decreased, and landscape was more diversified and homogenized. At class level, the dominance of residential land, fish pond, and industrial land increased but that of paddy field decreased, the LPI of paddy field and water area was much greater than that of other landscape types at each period, and the LPI of residential land, industrial land, and fish pond increased gradually over time. The LSI of water area and dry land was the largest, followed by paddy field, residential land, and fish pond, indicating that these landscape types were more complex, while the others were relatively regular.

Key words: Mixed cropping, Gramineous plants, Root exudates, Apoplast Fe, Root Fe(Ⅲ) reducing capacity