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为充分了解与掌握秦巴山区耕层土壤微量元素现状、空间分布规律及其影响因素,为区域土壤微量元素的科学管理及土壤微肥应用提供理论依据和实践指导,以镇巴县为例,基于2010年陕西省耕地地力调查与质量评价项目数据,采用地统计学和GIS相结合的方法,研究秦巴山区耕层土壤有效态Fe、有效态Mn、有效态Cu和有效态Zn的空间特征及其影响因素。结果表明:1)镇巴县耕层土壤有效态Fe、Mn和Cu均属中等变异强度,变异系数介于81.38%~97.57%之间,有效态Zn属强变异强度,变异系数为117.09%;2)空间特征上,根据块金系数值,4种微量元素均表现为中等强度的空间相关性,县域质量分数的空间分布呈南部高、西部低格局,空间变异性是由自然因素(土壤理化性质、地形地貌和常年降水量等)和人为因素(作物熟制和村距等)共同作用而引起的;3)镇巴县耕层土壤整体有效态Cu和Fe质量分数丰富,Zn质量分数适宜,19.14%Mn缺乏(<5 mg/kg),需结合不同的耕作制度、土壤类型及其质量分数丰缺水平进行分区培肥与管理。
In order to fully understand and grasp the present situation and spatial distribution of trace elements in tillage soil and their influencing factors in Qinba Mountains, provide theoretical basis and practical guidance for the scientific management of soil trace elements and the application of soil trace fertilizers in the region. Taking Zhenba County as an example, Based on the data of land productivity survey and quality evaluation of cultivated land in Shaanxi Province in 2010, the spatial characteristics of available soil Fe, available Mn, available Cu and available Zn in topsoil of Qinba Mountain were studied by using the combination of geostatistics and GIS. And its influencing factors. The results showed that: 1) The available soil fertility of Fe, Mn and Cu in Zhenba county were moderately variable with the coefficients of variation ranging from 81.38% to 97.57%. The effective Zn was strongly mutated and the coefficient of variation was 117.09%. 2) According to the gold nugget value, all the four trace elements showed moderate intensity spatial correlation. The spatial distribution of the county mass fraction showed the southern high and the western low pattern. The spatial variability was caused by the natural factors Nature, topography and annual precipitation) and human factors (crop ripening and village distance, etc.) caused by the interaction; 3) Zhenba County tillage soil overall effective Cu and Fe mass fraction rich, Zn mass fraction appropriate , 19.14% Mn deficiency (<5 mg / kg), and the combination of different tillage systems, soil types,