榆林地区土壤养分时空变异研究
发布时间：2019-01-24 18:12
【摘要】：土壤养分具有空间异质性,掌握土壤的时空变异特征对我国保护耕地、合理管理土地、科学种田具有重要意义。榆林市是陕西省乃至全国最重要的资源型城市,随着近年来资源的开采,土地质量严重下降。因此本文基于对榆林地区的土壤养分时空变异进行研究,探索榆林地区的土壤养分的分布特点和变化趋势,为榆林农业生产和土壤保护提供依据。本文主要是基于IDRISI17.0与ArcGIS10.0互相结合的办法,在掌握了榆林地区80年代各种土壤养分等级图和2010年陕西省农业厅土地测肥站提供的土壤养分样点数据等资料的基础上,着重解析了土壤全氮、速效磷的时空变异特征。榆林地区土壤氮和速效磷的时空变异特征基本相似,在时间变异特征上表现出土壤养分等级有所提高,土壤质量改善,各个等级面积分布均发生了变化。在空间变异特征上表现为南六县比北六县土壤养分等级高,土壤质量好的特点,并且两个区域的土壤质量均有变好的趋势。榆林地区土壤养分表现出的土壤养分空间变异特征,主要是由于地表组成物质的差异以及人类活动的影响。
[Abstract]:Soil nutrient has spatial heterogeneity. It is very important to grasp the characteristics of soil spatial and temporal variation for protecting cultivated land, managing land reasonably and planting land scientifically in China. Yulin is one of the most important resource-based cities in Shaanxi Province and even the whole country. With the exploitation of resources in recent years, the land quality has declined seriously. Therefore, based on the study of temporal and spatial variability of soil nutrients in Yulin area, the distribution characteristics and changing trend of soil nutrients in Yulin area were explored, which provided the basis for agricultural production and soil protection in Yulin area. This paper is mainly based on the method of combining IDRISI17.0 and ArcGIS10.0, on the basis of mastering all kinds of soil nutrient grade maps in Yulin area in the 1980s and the soil nutrient sample data provided by the Land Fertilizer Station of Shaanxi Province Department of Agriculture in 2010, etc. The temporal and spatial variation characteristics of soil total nitrogen and available phosphorus were analyzed. The temporal and spatial variation characteristics of soil nitrogen and available phosphorus in Yulin area were similar. The temporal variation characteristics showed that the soil nutrient grade was improved and the soil quality was improved. The area distribution of each grade had been changed. The spatial variation was characterized by higher soil nutrient grade and better soil quality in the south six counties than in the north six counties, and the soil quality of the two regions had a tendency to improve. The spatial variability of soil nutrients in Yulin area is mainly due to the difference of surface composition and the influence of human activities.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S158
本文编号：2414697
[Abstract]:Soil nutrient has spatial heterogeneity. It is very important to grasp the characteristics of soil spatial and temporal variation for protecting cultivated land, managing land reasonably and planting land scientifically in China. Yulin is one of the most important resource-based cities in Shaanxi Province and even the whole country. With the exploitation of resources in recent years, the land quality has declined seriously. Therefore, based on the study of temporal and spatial variability of soil nutrients in Yulin area, the distribution characteristics and changing trend of soil nutrients in Yulin area were explored, which provided the basis for agricultural production and soil protection in Yulin area. This paper is mainly based on the method of combining IDRISI17.0 and ArcGIS10.0, on the basis of mastering all kinds of soil nutrient grade maps in Yulin area in the 1980s and the soil nutrient sample data provided by the Land Fertilizer Station of Shaanxi Province Department of Agriculture in 2010, etc. The temporal and spatial variation characteristics of soil total nitrogen and available phosphorus were analyzed. The temporal and spatial variation characteristics of soil nitrogen and available phosphorus in Yulin area were similar. The temporal variation characteristics showed that the soil nutrient grade was improved and the soil quality was improved. The area distribution of each grade had been changed. The spatial variation was characterized by higher soil nutrient grade and better soil quality in the south six counties than in the north six counties, and the soil quality of the two regions had a tendency to improve. The spatial variability of soil nutrients in Yulin area is mainly due to the difference of surface composition and the influence of human activities.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S158
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