【摘要】 为研究大兴安岭地区土壤有机质(SOM)空间特征并进一步探究其影响因素,使用采样间距为15 m×15m的五点采样方法采集具有较强代表性的土壤样点数据共181个,获取各点属性数据及坐标值,再通过普通克里金插值方法初步分析SOM分布情况,并与遥感影像反演得出的SOM预测结果相结合。结果表明:大兴安岭地区的SOM含量变异系数为76.95%,属中等程度变异;与光谱反射率数据进行数学变换后得到的近红外波段5存在显著相关,相关系数最高可达-0.676;其次是红色波段4,相关系数为-0.508;SOM含量北高南低,其中大多数山区的含量较高。研究区的SOM空间变异是变海拔、坡度、坡向和土壤pH等因素综合影响的,其中海拔和土壤pH为主控因素。在累积与消耗SOM过程中,地形因子及人类活动可能会造成深远影响,研究结果可为大兴安岭地区的土壤资源可持续发展、农业结构调整及大尺度下预测分析SOM提供参考。更多还原

【Abstract】 In order to study the spatial characteristics of soil organic matter(SOM)in Daxing’an Mountains and further explore its influencing factors,181 representative soil samples were collected by using the five point sampling method with a sampling interval of 15 m×15 m.The attribute data and coordinate value of each point were obtained.Then,the distribution of SOM was preliminarily analyzed by ordinary Kriging methods and combined with the SOM prediction results from remote sensing image inversion.The results show that the variation coefficient of SOM content in Daxing’an Mountains is 76.95%,which belongs to medium degree variation; the near-infrared band 5 obtained by mathematical transformation of spectral reflectance data has significant correlation,with the highest correlation coefficient of-0.676; the next is red band 4,with the correlation coefficient of-0.508; the content of SOM is higher in the north and lower in the south,and the content in most mountain areas is higher.The spatial variation of SOM in the study area is affected by the factors of altitude,slope,slope direction and soil pH,among which altitude and soil pH are the main controlling factors.In the process of accumulation and consumption of SOM,topography factors and human activities may have a far-reaching impact.The research results can provide a reference for the sustainable development of soil resources,agricultural structure adjustment and large-scale prediction and analysis of SOM in Daxing’an Mountains.更多还原