论文部分内容阅读
根据德阳市旌阳区1803个土壤采样点数据,采用地统计学和回归分析方法,对其土壤全氮和碱解氮的空间变异特征进行分析,探讨不同因素对其空间变异的影响。结果表明,研究区土壤全氮和碱解氮含量范围分别为0.52-4.38 g/kg和15.00-326.74 mg/kg,均处于较丰富的水平。土壤全氮和碱解氮的块金值与基台值之化分别为0.264和0.505,具有中等空间相关性,受结构因素与随机因素共同影响。空间分布上均表现为西部平原区明显高于东部丘陵区。土壤母质可独立解释25.7%和12.2%的全氮和碱解氮空间变异。地形因素的解释能力分别为16.7%-29.7%和7.6%-16.2%,其中坡度因子的解释能力最大。土类、亚类和土属对全氮和碱解氮空间变异的独立解释能力分别为23.4%、28.0%、36.6%和12.5%、13.8%、18.6%。种植制度对全氮空间变异的解释能力为33.8%,小于土属的影响程度;对碱解氮的解释能力为22.4%,大于各种结构因素的独立解释能力。研究结果表明研究区土壤全氮空间变异主要受母质、地形等结构因素的综合影响,而人为活动因素是碱解氮空间变异的主控因素。
According to the data of 1803 soil sampling sites in Jingyang District of Deyang City, the spatial variability of soil total nitrogen and available nitrogen was analyzed by geostatistics and regression analysis, and the effects of different factors on their spatial variability were discussed. The results showed that the contents of total nitrogen and available nitrogen in the study area were 0.52-4.38 g / kg and 15.00-326.74 mg / kg, respectively, all at a relatively high level. The values of nuclide value and base station value of soil total nitrogen and available nitrogen are 0.264 and 0.505, respectively. They have moderate spatial correlation and are affected by structural factors and random factors. The spatial distribution showed that the western plain area was obviously higher than the eastern hilly area. Soil parent materials independently explained 25.7% and 12.2% of the total N and available N spatial variability. The explanatory power of the topographic factors is respectively 16.7% -29.7% and 7.6% -16.2%, of which the slope factor has the largest explanatory power. The independent interpretation ability of soil, subclass and soil is 23.4%, 28.0%, 36.6% and 12.5%, 13.8% and 18.6% respectively. The planting system explained the spatial variability of total nitrogen 33.8%, which is less than the degree of influence of soil genus. The ability of interpreting nitrogen is 22.4%, which is larger than the independent interpretation of various structural factors. The results showed that the spatial variability of soil total nitrogen in the study area was mainly affected by the structural factors such as parent material and topography. The anthropogenic factors were the main controlling factors for the spatial variability of soil available nitrogen.