关键词: 耕地集约利用, 熵权法, Kernel密度法, 时空分异, 双重自组织模型, 河南省

Abstract:

The intensive use of cultivated land resource is not only the key to improve the cultivated land use efficiency and to ensure the national food security, but also been one of the most important components in rural development and social stability. Henan is the largest agricultural province and the most populous province in China, research on the intensive use of cultivated land in Henan is a window for penetrating into phenomena in China, for which occupying more than 6% cultivated land area in China. Considering the actual situation of the 126 counties in Henan Province, the evaluation index system for cultivated land use intensity was established from four aspects, including land investment degree, utilizing intensity, output efficiency and sustainable development status. The weight of each index was calculated by the entropy method, and then the intensity of cultivated land use in 1990, 2000 and 2010 at county level was evaluated and graded. The results demonstrated that: 1) As for temporal characteristic, the average degree of cultivated land intensive use showed an increasing tendency, increased from 0.262 in 1990 to 0.461 in 2010, and the total disparities of intensive use degree in Henan at county level have enlarged. The distribution shapes of intensive use degree were typical “single peak” shapes in the three years, transforming from "spike peak" in 1990 to "broad peak" in 2000 and 2010. 2)As for spatial characteristic, the character of spatial clustering about counties of high value and low value was remarkable, and intensive degree was significantly higher in eastern plain region than in western mountain area, higher in northern region than in southern region. The investment degree and utilizing efficiency of cultivated land were the main reasons that lead to the increment of cultivated land intensive use, while utilizing intensity and sustainable development status improved slower. The level of cultivated land intensive use in most counties from 1990 to 2010 showed a steady increase. 3) The spatial difference of cultivated land intensive use was resulted mainly from location condition, natural features and economic condition, and the main driving forces influencing cultivated land intensive use in different counties were different. The 126 counties in Henan were aggregated into five regions by self-organizing dual zoning method, including the eastern Huang-Huai plain area, the northern plain area, the southeast plain area, the central-south plain area and the western mountain area, and some suggestions on cultivated land intensive use were brought forward.

Key words: cultivated land use intensity, the entropy method, the kernel density method, spatial-temporal variance, self-organizing dual zoning method, Henan Province