2008年海陵岛土地利用类型适宜性评价

Fitness evaluation of the land use forms in HailingIsland in 2008

以人类对土地开发利用的布局和选址经验为基础,以海陵岛2003年的土地利用类型为样本,选取对海陵岛土地利用布局影响最大的土壤类型、高程、坡度、坡向、离岸距离和交通条件6种因素作为评价因素,采用栅格数据空间叠加分析的方法,根据土地利用类型与评价因素等级组合的频繁度,确定不同土地利用类型在各评价因素下的适宜度,求出各评价因素的适宜度权重,运用加权求和法获得海陵岛2008年土地利用在全部评价因素下的综合适宜度,并对综合适宜度进行分等定级。评价结果表明,海陵岛2008年土地利用类型非常适宜的占总面积的41%,中等适宜的占28%,主要土地利用类型均为有林地,分布在马尾山等山脉,主要受高程和土壤类型影响;一般适宜的占20%,主要土地利用类型为养殖水面,分布在离岸较近的海湾,主要受离岸距离和交通条件影响;临界适宜的占11%,不适宜的约占1%,主要土地利用类型均为旱地,分布在北极村等村庄周边,主要受土壤类型和高程影响。

Island refers to the naturally formed land areas above the sea surface during high tide and surrounded by seawater.The island land resources include island land and intertidal zone.China is a large country with a large number of islands,but the management of the islands is left behind.With the development of exploitation of the islands,land resources protection and management of the islands becomes more and more important.Land fitness evaluation is the basis and core of overall land use planning.The purpose of the fitness evaluation of the use of island land resources is to support island protection and management,and achieve sustainable use of island land resources.In this paper,Hailing Island was taken as the study area,and 2003SPOT-5and 2008aviation images as the data source.Based on the knowledge of land use layout and site selection experiences,the land use forms of Hailing Island in 2003were used as samples,soil type,elevation,grade and aspect of slope,distance to the shore and traffic condition which have the greatest impact on land use were selected as the evaluation factors,and the raster data spatial overlay analysis method was used to determine the fitness of different land use forms according to the combining frequency of the land use form and the evaluation factors,and work out the suitable weight of every evaluation factor,then the integrated fitness of the land use in 2008of Hailing Island for all the evaluation factors was obtained with weighted summation method and graded.The results show that the very appropriate land use form of the Hailing Island in 2008accounts for 41%of the total area,and medium fitness for 28%.The main forms of the land-use are forest lands,distributed at hills such as the Mawei Mountain,which are mainly influenced by the elevation and soil type.The general fitness accounts for 20%,which are mainly aquiculture waters,distributed in the gulf not far away from the shore,and mainly influenced by the distance from the shore and traffic condition.Critical fitness accounts for 11%,and unfitness for about 1%,of which the major land use form are dry land,distributed near the villages like Beiji,and mainly influenced by the soil type and elevation.