市场容量与区域土地生产潜力开发程度研究

Research on the Relationship Between the Market Carrying-Capacity Demands and the Development Degree of Land Productive Potentiality

“一江两河”地区未来大宗农产品合理市场控制范围包括拉萨、山南、日喀则三地市的３８个县、市和那曲与阿里地区，到２０００年该区合理市场范围对粮食的总需求量为１１５７６１．４５万ｋｇ，在现有基础上需增加５２６１９．８０万ｋｇ；届时土地生产潜力开发程度要求达到３６．７５％，与现实相比，需提高１６．７１％，平均每年要求增长１．６７％；粮食单产要求达到６５６１．４５ｋｇ／ｈｍ￣２，需增加２９５１．２５ｋｇ／ｈｍ￣２，平均每年增加２９５．２ｋｇ／ｈｍ￣２，这一指标比国家要求的２０００年开发目标７８１４１．６５万ｋｇ多３７４１９．８０万ｋｇ，单产高出２１０１．０５ｋｇ／ｈｍ￣２。

The rational market controlling range of the future large-scale staple a-gro-products in the“three-river regions includes 38 counties and cities in Lhasa. Shan-nan and Xigaze and the districts of Naqu and Ali.The total grain demands of marketranges in this region will, by the year of 2000,be 1.1576145 billion kg on the basis ofwhich 526. 198 miliion kg will still be inereased.By that time, the development degree ofland productive potentiality will be required to reach 36. 75%in comparison with the ex-isting degree with an increase of 16.71%to be required, but an average increase of1. 67%to be required each year. The per unit area grain yield is required to reach6561.45kg/hm￣2. Therefore, 2951.25 kg/hm￣2 are required to increase with an annual in-crease of 295. 2 kg/hm￣2.This target will have 374. 198 million kg higher than the nation-al development target of 781.4165 million kg to be reqtiired by the country by the yearof 2000.Therefore,per unit area yield should be 2101.05 kg/hm￣2 higher than that set inthe plan.