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选取安徽省郑蒲港新区作为研究区域,运用地理信息系统与地统计学相结合的方法,选取土壤有机质、p H、全氮、碱解氮、有效磷、速效钾作为研究对象,选择不同的插值模型,并分析了各土壤要素的空间变异特征。结果表明,受到土地平整和施肥等人为因素影响,地形因子(高程、坡度)对土壤养分的影响程度较小,研究区河流隔开采样数据出现空间不连续,采用区域分块插值的核平滑方法插值模型最为稳定,更加符合研究区实际情况,不会出现为满足假设条件而出现系数为负的插值方程。研究区5种土壤元素均呈现南北低中间高的趋势,土壤速效钾和有效磷的变异系数较高,碱解氮和有机质变异性较弱,p H变异性最弱。占研究区90%以上的土壤4种养分元素均土壤有机质含量均处在中上水平以上,只有占研究区面积的19.66%和72.30%的碱解氮,分别处在中上、中下水平,研究区面积的61.6%和35.67%的p H分别处于酸和弱酸级水平。
Taking Zhengpu Port New Area of Anhui Province as the research area, using the combination of geographic information system and geostatistics, the soil organic matter, p H, total nitrogen, available nitrogen, available phosphorus and available potassium were selected as the research object, Interpolation model, and analyzes the spatial variation characteristics of soil elements. The results showed that topographical factors (elevation and slope) affected the soil nutrient to a lesser extent due to human factors such as land leveling and fertilization. Spatial discontinuities in river-separated sampling data in the study area were observed using kernel-smoothing method of regional block interpolation The interpolation model is the most stable, and more in line with the actual situation in the study area, there will not appear to meet the assumptions and the coefficient of negative interpolation equation. The five soil elements in the study area showed a trend of high in the middle and low in the north and south. The coefficients of variation of soil available K and available P were relatively high, and the variability of alkaline hydrolysis N and organic matter was weak. The p H variability was the weakest. The contents of soil organic matter in all the four nutrient elements accounting for more than 90% of the study area were above the middle and upper levels, accounting for 19.66% and 72.30% of the total area of the study area, respectively, at middle to upper middle and lower middle levels , 61.6% of the study area and 35.67% of p H were at acid and weak acid level, respectively.