【摘要】：土壤養(yǎng)分具有空間異質(zhì)性,掌握土壤的時(shí)空變異特征對(duì)我國(guó)保護(hù)耕地、合理管理土地、科學(xué)種田具有重要意義。榆林市是陜西省乃至全國(guó)最重要的資源型城市,隨著近年來(lái)資源的開(kāi)采,土地質(zhì)量嚴(yán)重下降。因此本文基于對(duì)榆林地區(qū)的土壤養(yǎng)分時(shí)空變異進(jìn)行研究,探索榆林地區(qū)的土壤養(yǎng)分的分布特點(diǎn)和變化趨勢(shì),為榆林農(nóng)業(yè)生產(chǎn)和土壤保護(hù)提供依據(jù)。本文主要是基于IDRISI17.0與ArcGIS10.0互相結(jié)合的辦法,在掌握了榆林地區(qū)80年代各種土壤養(yǎng)分等級(jí)圖和2010年陜西省農(nóng)業(yè)廳土地測(cè)肥站提供的土壤養(yǎng)分樣點(diǎn)數(shù)據(jù)等資料的基礎(chǔ)上,著重解析了土壤全氮、速效磷的時(shí)空變異特征。榆林地區(qū)土壤氮和速效磷的時(shí)空變異特征基本相似,在時(shí)間變異特征上表現(xiàn)出土壤養(yǎng)分等級(jí)有所提高,土壤質(zhì)量改善,各個(gè)等級(jí)面積分布均發(fā)生了變化。在空間變異特征上表現(xiàn)為南六縣比北六縣土壤養(yǎng)分等級(jí)高,土壤質(zhì)量好的特點(diǎn),并且兩個(gè)區(qū)域的土壤質(zhì)量均有變好的趨勢(shì)。榆林地區(qū)土壤養(yǎng)分表現(xiàn)出的土壤養(yǎng)分空間變異特征,主要是由于地表組成物質(zhì)的差異以及人類活動(dòng)的影響。
[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.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：S158

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本文編號(hào)：2414697