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采用地统计学和回归分析方法,研究川北烟区土壤全氮(TN)和碱解氮(AN)的空间变异特征,并探讨了不同因素对其空间变异的影响程度,为改善土壤氮素环境提供依据。结果表明:川北烟区土壤TN与AN值分别在0.19~2.57 g kg-1和11.00~203.00 mg kg~(-1)之间,平均值为1.31 mg kg~(-1)和95.22 mg kg-1,均处于中等水平。土壤TN和AN块金系数分别为0.655和0.682,均属于中等空间自相关,变异主要受随机因素与结构因素共同影响。空间上来看,研究区域土壤TN和AN含量分布具有较好的相关性,相似度达到0.871。土类、亚类对TN、AN的独立解释能力分别是23.5%、22.1%和25.1%、22.4%;土壤质地可以独立解释11%和10.5%的TN与AN空间变异;土体结构对TN及AN空间变异的独立解释能力只有4.2%和1.9%;前茬作物对土壤TN及AN空间变异的独立解释能力最高,是引起川北烟区土壤氮素空间变异最主要的因素。
Geostatistics and regression analysis were used to study the spatial variability of soil total nitrogen (TN) and alkaline hydrolysis nitrogen (AN) in North Sichuan tobacco-growing areas. The effects of different factors on their spatial variability were discussed. In order to improve soil nitrogen environment Provide evidence. The results showed that the soil TN and AN values in the tobacco growing areas of North Sichuan were between 0.19 and 2.57 g kg-1 and 11.00 to 203.00 mg kg -1, with the average values of 1.31 mg kg -1 and 95.22 mg kg -1, respectively. 1, are in the middle level. The nugget of TN and AN in soil were 0.655 and 0.682, respectively, belonging to the medium-spatial autocorrelation. The variation was mainly affected by random factors and structural factors. Spatially, the distribution of soil TN and AN in the study area has a good correlation with a similarity of 0.871. The independent interpretation ability of soil and subclasses to TN and AN were 23.5%, 22.1% and 25.1% and 22.4% respectively. The soil texture could independently explain the spatial variation of TN and AN at 11% and 10.5% The independent interpretations of AN spatial variability were only 4.2% and 1.9%, respectively. The ability of stubble crops to independently interpret the spatial variability of soil TN and AN was the highest, which was the most important factor causing the spatial variability of soil nitrogen in North China.