甘肃河西地区耕地面积变化及利用效益分析

Comprehensive utilization benefit analysis on cultivated land change in Hexi Area

采用综合指数评价法和聚类分析法对2003年～2012年河西地区耕地面积及耕地综合效益的时空变化特征进行了分析.结果表明：10a间河西地区耕地总量呈增加趋势,共增加了106 786.67hm2,其中,酒泉、张掖和武威的耕地面积变化较大;从时间来看,10a间嘉峪关市和武威市耕地利用效益则呈波动上升趋势,而张掖、酒泉和金昌市耕地利用效益则呈波动下降趋势;从空间来看,嘉峪关市耕地利用综合效益最高,土地利用效益评价值达0.507 5,张掖、酒泉次之,分别为0.369 9和0.406 6;金昌和武威较低,分别为0.280 0和0.253 2.

It is significant to study the benefit of cultivated land utilization for improving the whole comprehensive benefits of cultivated land and protecting cultivated land effectively in Hexi area of Gansu Province.By using comprehensive evaluation index method and clustering analysis to study the changes for the benefits of cultivated land utilization on spatial and temporal variation in Hexi area in 2003～2012.The results showed that the total cultivated land amount had an increasing trend,which increased 106 786.67hm2 in last 10 years,it had a great influence on cultivated land of Jiuquan,Zhangye and Wuwei;From temporal analysis,the benefits of cultivated land utilization changes showed a fluctuation rise trend in Jiayuguan and Wuwei,however,Zhangye,Jiuquan and Jinchang had reverse trend.From spatial analysis,the benefits of cultivated land utilization in Jiayuguan was maximum,the second was Zhangye and Jiuquan,Jingchang and Wuwei was the lowest.The benefit of cultivated land evaluation value of the five cities was0.28,0.11,0.13,0.09 and 0.07,respectively.