建瓯市竹林分布与土壤有机质空间变异研究

A Study of Bamboo Distribution and Soil Organic Matter Spatial Variation of Jian’ou City

以建瓯市为研究区域,基于遥感影像提取建瓯市竹林分布信息并形成研究底图,在此基础上以乡(镇)为单位,进行竹林土壤采样,通过半方差分析和空间插值来揭示研究区竹林土壤有机质的空间变异特征。最佳指数法的计算结果表明,356波段为竹林提取的最佳组合方式。在此基础上采用最大似然法得到的竹林解译的Kappa系数为89.4%,精度较高。竹林土壤有机质的均值为39.5 g/kg,在西南部和东北部较高,中部较低。土壤有机质受到结构性和随机因素的共同影响,即自然条件和人为因素的综合影响,因此竹林的管理和规划要更注重人为因素的影响。

The bamboo distribution information of Jian’ou city was extracted from remote images,and taken as the base map in our study.Soil sampling was conducted in the bamboo area.The spatial variations of soil organic matter(SOM)of bamboo forest were discussed using the method of semi-variance analysis and spatial interpolation.The results of optimum index factor(OIF)index revealed that the band 356 was the optimum model to extract the bamboo distribution information.Then the method of maximum likelihood estimate was applied for interpretation and the Kappa coefficient was 89.4%.With an average value of 39.5 g/kg,the content of SOM was higher in the southwest and northeast,and lower in the central region.The spatial distribution of SOM was influenced by the structural and random factors together.Accordingly,the human factors should be noted in the management and planning of bamboo forest.