珠江三角洲小城镇耕地动态变化研究

Study on dynamic changes of cultivated land of the town in the Pearl River Delta

选择位于珠江三角洲腹地的佛山市南海区盐步为研究区域，采用GIS技术与方法，对其耕地动态变化及趋势进行分析。研究表明，1987～2003年间耕地变化是盐步土地利用变化的核心类型，耕地年变化率达到4．50％，各村委会耕地面积变化存在差异；耕地主要转化为园地、独立工矿用地、农村居民点用地、城镇用地和交通运输用地，占耕地变化面积的70．82％；耕地内部三级类型的相互转化趋势明显，主要是由灌溉水田向菜地进行转化；耕地景观格局变化明显，斑块数量不断增加，平均斑块面积急剧减少，耕地并4用不断破碎化，斑块形状趋于复杂化，耕地在研究区的地位不断下降；预测到2010年和2020年，耕地仍将呈减少趋势，占土地总面积比重分别比2003年减少1．89和3．11个百分点。图3，表6，参11。

The paper, taking Yanbu Town Nanhai District Foshan City, which is one of the famous towns majored in underwear in the Pearl River Delta for example, with the help of GIS technology, analyses the dynamic changes of cultivated land and its trend. The main conclusions as follows： ①Cultivated Land change is the core type of land use changes in Yanbu; the area of cultivated land in Yanbu has reduced from 1582.82 hm^2 in 1987 to 443.60 hm^2 in 2003, average annual rate up to 4.50% ; differences in cultivated land change exist in different villages; ②cultivated land in Yanbu has mainly turned into garden land, independent industrial and mining land, rural residential land, city land and traffic land, which was 70.82% of cultivated land change area; ③ the interior types have changed obviously, mainly from irrigated field to vegetable land, in the unchanged cultivated land; ④the Landscape panems of cultivated land have varied distinctly; patch amount continuous increase, but average patch area sharp reduction, cultivated land use more and more broken, patch shapes more complex, degree of cultivated land in the researeh area constant diminution; ⑤ according to the forecasting, the area of cultivated land will continue to decrease.