关键词: 耕地地力, 等级划分, 土壤养分

Abstract: Based on 2 814 survey sample data of cultivated land， comprehensive evaluation and classification for 37 7723 hm2 cultivated land in Yuhang District was conducted by ArcGIS technologies. It was shown that the overall quality of cultivated land were good， and the proportion of first to fifth class cultivated land was 10%， 396%， 441%, 131% and 22%， respectively. The first and second class farmland were mainly distributed in the plains and along the river valley. The third and fourth class farmland were mainly distributed in the transition zone of the plains to the mountains in hilly area. The fifth class farmland were mainly distributed in the mountainous area in the northwest and southwest. There were huge differences of soil nutrients in hilly areas， while there was smaller variation of soil nutrients in plains. The total nitrogen and organic matter content of soil were abundant in arable land， while available phosphorus was relatively deficient. And the variation of available potassium content in Yuhang District was relatively stable.

Key words: cultivated land arability, classification, soil nutrients