关键词: 土地利用格局, 置换变化, 代换变化, 转移矩阵, 晋江流域

Abstract:

Land-use change has been a key component for global environmental change. The conversion matrix is a fundamental tool in the analysis of land-use change. In order to obtain as much information as possible from the conversion matrix, two new patterns of land-use change, which were named as displacement and substitution, were proposed. Accordingly, the total change that characterized in an individual category is then divided into net change, displacement, and substitution. The calculation formulas for the displacement and substitution were also derived. The land-use change among eight land categories of Jinjiang watershed that locate in southeast China, was taken as an example to illustrate the proposed methods. The results show that great changes have taken place in the area from 1985 to 2006. The garden area, built-up land and unused land increased remarkably, while the dry land and grassland decreased, with the waters kept almost unchanged. The swaps between the above six land categories were relatively few, and the main format of change is in the pattern of displacement. Most of the changes in irrigated land and forestland happened in their spatial location swaps. However, for irrigated land, it was mainly displaced by the forestland or dry land; and for forestland, it was mainly substituted with garden area and grassland. The results also indicate that the new patterns—displacement and substitution, are helpful for the analysis of land-use change.

Key words: land-use pattern, displacement, substitution, conversion matrix, Jinjiang watershed