川中丘陵区土壤有机质和碱解氮空间变异特征研究

发布时间：2018-12-10 10:38

【摘要】：选取典型川中丘陵区域——大英县441个表层土壤样点数据,采用地统计学和GIS相结合的方法,对该区土壤有机质(OM)和碱解氮(AN)的空间变异特征及其影响因素进行分析。结果表明,研究区OM和AN的平均值分别为15.22 g/kg、76.75 mg/kg,总体偏低。空间分布上,土壤OM呈现出北高南低、中间最低的分布趋势;而AN无明显分布趋势,低值区集中分布在研究区的中部。从半方差分析结果来看,土壤OM和AN块金值与基台值的比值分别为83.55和51.32,说明OM的空间变异主要受耕作、施肥等随机性因素影响,而AN的空间变异则受随机性因素和气候、土壤类型及地形等结构性因素的影响。影响因素分析表明,地形、土壤类型及种植制度是影响研究区土壤OM和AN含量空间变异性的重要因素,而成土母质对OM和AN含量的影响不显著。在土地利用与施肥过程中,应充分考虑各影响因素对研究区土壤OM和AN空间变异性的影响。
[Abstract]:The spatial variation characteristics and influencing factors of soil organic matter (OM) and alkali-hydrolyzed nitrogen (AN) in Daying County, a typical hilly region of central Sichuan, were analyzed by using geostatistics and GIS. The results showed that the average values of OM and AN were 15.22 g / kg 路kg ~ (-1) and 76.75 mg/kg, respectively. In spatial distribution, soil OM showed a distribution trend of north high, south low and middle lowest, while AN had no obvious distribution trend, and the low value area was concentrated in the middle of the study area. The results of semi-variance analysis showed that the ratios of OM and AN were 83.55 and 51.32, respectively, which indicated that the spatial variation of OM was mainly affected by random factors such as tillage and fertilization. The spatial variation of AN was influenced by random factors, climate, soil type and topography. The analysis of influencing factors showed that topography, soil type and planting system were the important factors influencing the spatial variability of OM and AN content in the study area, but the soil-forming parent material had no significant effect on OM and AN content. In the process of land use and fertilization, the effects of various factors on the spatial variability of soil OM and AN in the study area should be fully considered.
【作者单位】：四川农业大学资源学院;
【基金】：“十二五”国家科技支撑计划项目(2012BAD14B18) 四川省科技支撑计划项目(2013NZ0028)资助
【分类号】：S153.6

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