唐山市耕地压力动态变化与调控策略

Analysis of Dynamic Change of Arable Land Pressure and Its Control Strategy in Tangshan City

根据唐山市1984-2008年相关数据,分析了耕地-粮食-人口系统的动态变化,计算了耕地压力指数,并分析了该指数的动态变化及成因。分析结果表明:1984年以来唐山市耕地面积及其人均量持续减少;粮食总产量及人均产量呈先增加后减少的变化趋势;受其影响最小人均耕地面积和耕地压力指数呈现相似的变化趋势。最后探讨了缓解耕地压力的调控策略,即保持区域内一定数量的耕地和种植高产作物是缓解耕地压力的重点。

First,the pressure index on arable land was calculated based on the data of arable land,grain and population of Tangshan city from 1984 to 2008.Then,the causes of dynamic change of pressure index on arable land were analyzed.The results are as follows：（1） Total arable land and its per capita volume has continued to decrease;（2）Total grain output and per capita output show the trend of first increased and then decreased;（3） Affected by the trends of total grain output and per capita output,minimum arable land acreage per capita and pressure index on arable land show the similar trends.In the end,the control strategy which was maintaining a certain amount of arable land area and cultivate high-yielding crop was discussed in order to ease the arable land pressure.