3. Results and discussion
3.1. The spatial patterns of LULC
LANDSAT TM data were used for the analysis of LULC. With the
aid of ground truth data throughout the calibration and validation
stages, the findings clearly indicate that LULC can be classified
into 7 categories including farmland, grassland, woodland, water
bodies, beach land, build-up land and saline-alkali land. Fig. 4 features
the side-by-side comparison of the spatial variations of LULC
two decades apart. Four dominant types of LULC in the study areainclude beach land, water body, saline-alkali land, and farmland.
Yet the distribution of grassland and woodland in this area is relatively
small accounting for only 0.1% and 1.6% of the entire region,
respectively, in 2000. The change of LULC from 1987 to 2000 is
134,940 ha, which accounted for 28% of the total study area. Grassland,
beach land and saline-alkali land decreased by 1.73%, 5.47%
and 7.99%, respectively. Within 13 years, the saline-alkali land
had been largely transformed to salt land (4.52%), farmland (4.0%),
build-up land (3.17%), and shrimp ponds (2.99%) (Fig. 4).
3. Results and discussion3.1. The spatial patterns of LULCLANDSAT TM data were used for the analysis of LULC. With theaid of ground truth data throughout the calibration and validationstages, the findings clearly indicate that LULC can be classifiedinto 7 categories including farmland, grassland, woodland, waterbodies, beach land, build-up land and saline-alkali land. Fig. 4 featuresthe side-by-side comparison of the spatial variations of LULCtwo decades apart. Four dominant types of LULC in the study areainclude beach land, water body, saline-alkali land, and farmland.Yet the distribution of grassland and woodland in this area is relativelysmall accounting for only 0.1% and 1.6% of the entire region,respectively, in 2000. The change of LULC from 1987 to 2000 is134,940 ha, which accounted for 28% of the total study area. Grassland,beach land and saline-alkali land decreased by 1.73%, 5.47%and 7.99%, respectively. Within 13 years, the saline-alkali landhad been largely transformed to salt land (4.52%), farmland (4.0%),build-up land (3.17%), and shrimp ponds (2.99%) (Fig. 4).
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