中文摘要：

粮食主产区河南省经济欠发达，粮食总产位居前列，以耕地压力指数对粮食安全进行定量分析和计算，采用重心量算模型和空间变差函数对河南省粮食安全的空间格局和变化特征进行了分析。研究结果表明：研究时段内，耕地压力指数小于1的县区主要位于河南省东部，呈现先增加后减少的趋势；最高值位于西北地区，最高值与最低值的差距逐步扩大，重心从东南平原区向西北山地区转移，迁移轨迹符合耕地变化情况。耕地压力指数的空间特征结构性上表现出一定的随机性，粮食安全总体格局表现出一定的稳定性，而各向异性表现明显，其中以南北的差距最为显著。

英文摘要：

As one of major grain producing area, Henan Province＇s economic is undeveloped, also the grain production is great. This study used cultivated land pressure index to analyze the grain security, by using gravity center and spatial variogram to an- alyze the spatial pattern and transfer of grain security. The results show that the area of cultivated land increased totally, the in- creased area located in east of Henan,while the west decreased, the counties that cultivated land pressure index less than 1 in- creased at first,then decreased. The counties that cultivated land pressure index less than 1 are mostly located in the east of Henan Province, the maximum value is located in the northwest, the gap between highest and lowest widened gradually. The center of gravity transferred from the southeast to the northwest. Structural spatial characteristics of the pressure index of culti- vated land showed a certain randomness,grain security overall pattern showed a certain stability, and anisotropic performance was significant, the north-south gap was the most significant.