河北省耕地-粮食-人口系统与耕地压力指数时空分布

Temporal and Spatial Distribution of Cropland-Grain-Population System and Pressure Index on Cropland in Hebei Province

根据河北省1980-2009年相关数据,在耕地-粮食-人口系统动态分析的基础上,计算耕地压力指数,分析该指数的时空动态变化及成因。结果表明:1980年以来河北省耕地面积及其人均量持续减少;粮食总产量及人均产量呈现增加-减少-增加的变化趋势;最小人均耕地面积和耕地压力指数呈现减小-增大-减小的相似变化趋势;省内各市耕地压力指数差异较大,北部地区耕地压力指数波动大且耕地压力明显。针对问题提出耕地-粮食-人口系统协调发展的调控重点。

First, the pressure index on arable land was calculated based on the data of arable land, grain and population of Hebei Province from 1980 to 2007. Then, the causes of dynamic change of pressure index on arable land and its Spatial and Temporal Variations 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 increasing-decreasingincreasing; （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 trend of decreasingincreasing-decreasing. In the end, the regulation focus on crolaland-grain-ooDulation system was t^roDosed.