农业土地利用变化及原因、效应分析

Change in Agricultural Land Use and Its Causes and Effects.

利用航空遥感影像结合野外调查方法 ,获取了研究区域 1 979年和 1 999年土地利用类型图 ,并分析了该时段土地利用变化情况。通过农户调查 ,探讨了土地利用变化的原因。分析表明 ,技术水平提高和投入增加是耕地产量提高的重要因素 ,提高土地经济收益是旱地土地利用结构变化的直接动力。

By combining aerial remote sensing images with field investigations,two agricultural land use maps of the studied region in 1979 and 1999 were obtained.Comparison and analysis of the two maps showed changes in land use during that period of time.Through visits to farmers,causes of the changes were explored.The result showed that technology and input were the major contributors to higher yield of the farmland,and to increase the economic benefit of the farmland was the direct driving force of the changes in land use structure of upland fields.