关键词: 土地资源, 土地利用, 结构优化, 持续利用, 辽河三角洲

Abstract: The Liaohe Delta is one of the four great deltas in China,namely,the Changjiang Delta,the Huanghe Delta,the Zhujiang Delta and the Liaohe Delta.The core position of the Liaohe Delta is located in Panjin City,Liaoning Provines.It is rich in natural resources,such as flat land resources,petroleum and natural gas resources buried underground and a vast area of reed,wetland and tideland.There are many favorable conditions for developing industry and agriculture in Liaohe Delta.To utilize the land resources fully and reasonably,the characteristics of the present structures in land utilization of the Liaohe Delta are analyzed.Some parameters concer ning land utilization structures are investigated on the spot.The optimization model of the reasonable structure in land utilization is identified by applying the linear programming method .In the optimization model,a linear inequality is built with many variables such as the areas of paddy field,dry land,reed,oilfield,salt pan and shrimp pond.And the objective function and the restrained conditions in the near future and in the long run are set out.By means of calculating optimization,the optimum composition of current land utilization in the near future and in the long run is obtained for the region of the Liaohe Delta.The values of the objective function are obtained from the optimum structure in land utilization in different period times.At the end of the paper,twelve countermeasures are put forward to realize the optimization of the land utilization structure and the sustainable land utilization of the Liaohe Delta.And the steps which ought to be taken for each countermeasure are also put forward.

Key words: land resources, land use, structure optimization, sustainable use, Liaohe Delta