基于ArcGIS的彭水县烟区土壤有效态微量元素丰缺评价  

ArcGIS-BASED ABUNDANCE EVALUATION OF AVAILABLE MICROELEMENTS IN TOBACCO SOIL IN PENGSHUI COUNTY

作　　者：秦建成[1] 罗云云[2] 魏朝富[1] 高明[1] 

机构地区：[1]西南大学资源环境学院,重庆400716 [2]西南林学院环境科学与工程系,昆明650224

出　　处：《土壤学报》2006年第6期892-897,共6页Acta Pedologica Sinica

基　　金：国家重点基础研究发展规划项目(01CB108905);重庆市科委项目(03-7948)资助

摘　　要：研究基于AreGIS技术，应用地统计学方法对彭水县烟区土壤微量元素丰缺状况进行了评价。结果表明：研究区域土壤微量元素中，有效铜、有效铁及有效锰的样本呈正态分布，其他微量元素为偏态分布，其变异系数在29．47％（有效钼）～51．76％（有效铁）之间变化；土壤有效铜、有效硼、有效铁和有效锰的样本数据最佳拟合模型为球状模型，有效钼和有效锌为指数模型；土壤微量元素的随机变异均小于结构性变异，有效铜、有效硼、有效钼及有效锌的空间自相关性相对较弱，有效铁及有效锰则具有较强的空间自相关性；有效铜、有效锰、有效硼含量偏低，有效钼、有效铁及有效锌含量丰富。A study on distribution of soil available nutrients on the field scale is important for improving agricultural management, and for assessing effects of agriculture on environmental quality and degrees of the influence of some random factors, such as human disturbance of soil properties. However, soil nutrients are highly heterogeneous whether on a large scale or a small scale, and their heterogeneity results from many processes acting and interacting across a continuum of spatial and temporal scales. Due to nutrient loss along with serious soil erosion in hilly area of Three Gorges Reservior Area, some researchers have studied mechanism of soil nutrient loss and how to control soil nutrient loss, and others have explored variability of soil nutrients described with classical statistical methods. However, there is little information available on spatial variability and scales of soil nutrients in this area. Hence, spatial patterns of soil available microelements in tobacco soil were studied in Pengshui, using geo-statistics of ArcGIS. Results show available Cu, available Fe and available Mn took on normal distribution while the others were subjected to Asymmetric distribution ; the coefficients of variation of soil available microelements ranged from available Mo of 29.47 % to available Fe of 51.76% ; global model and exponential model were applied to simulating them respectively; the random variance indexes of soil available microelements were all lower than their structural variance indexes and the available Fe and available Mn were characterized by relatively strong spatial correlation, while the others by weak one; available Cu, available Mn and available B tended to be lower, but available Mo, available Fe and available Zn were higher in content.

关 键 词：地统计学 空间异质性 分布格局 彭水县 

分 类 号：S158.3[农业科学—土壤学]