论文部分内容阅读
以鲁中南山区马蹄峪小流域土壤为对象,综合考虑土地利用和采样点的代表性及可操作性,采集表层(0～20 cm)土壤样品97个,利用回归克里格方法和“3S”技术,分析小流域土壤有机质和全氮的空间分布特征。结果表明:1)马蹄峪小流域表层土壤有机质和全氮质量分数平均值分别为20.45和1.18 g/kg,变异系数分别为27.68%和27.97%,土壤有机质和全氮与环境因子中的高程、坡度、坡向及归一化植被指数相关性较高,而高程及坡向余弦值是回归预测模型所选因子中最优的,从对预测准确性分析来看,回归克里格插值预测结果精度优于普通克里格插值预测结果;2)半方差函数模型中,土壤有机质和全氮质量分数回归值的空间自相关性很强,基台效应值分别为7.3%和17.50%,而土壤有机质和全氮质量分数残差值的空间自相关性为中等,基台效应值分别为33.93%和25.58%;3)土壤有机质和全氮质量分数在空间分布图中均呈现从东南向西北方向逐渐降低的趋势,土壤有机质质量分数在不同土地利用方式下表现为麻栎林地>黑松林地>蔬菜地>玉米地>板栗林地>荒草地的格局,而全氮质量分数则表现出麻栎林地>蔬菜地>黑松林地>玉米地>板栗林地>荒草地的格局,土壤有机质和全氮质量分数在不同高程下整体呈现高程越高,土壤有机质和全氮质量分数越大的趋势,土壤有机质和全氮质量分数在不同坡向下由高到低则均呈现阴坡>半阳坡>阳坡的格局。
Taking the soil of Mudouyu small watershed in Luzhongnan mountainous area as an example, 97 soil samples (0 ~ 20 cm) were collected considering the representativeness and operability of land use and sampling points. The regression Kriging method and 3S "Technology to analyze the spatial distribution of soil organic matter and total nitrogen in small watershed. The results showed as follows: 1) The average contents of soil organic matter and total nitrogen in the soil surface were 20.45 and 1.18 g / kg respectively in Matiyu valley, the coefficient of variation was 27.68% and 27.97% respectively. The elevation of soil organic matter, total nitrogen and environmental factors, Slope, slope and normalized vegetation index correlation is high, while the elevation and slope cosine is the regression model of the selected factor optimal, from the prediction accuracy analysis, the regression kriging interpolation prediction results The accuracy is better than that of ordinary Kriging interpolation; 2) In the semi-variance function model, the spatial autocorrelation of soil organic matter and total nitrogen is very strong, and the base effects are 7.3% and 17.50% The spatial autocorrelation of the residual values of organic matter and total nitrogen was moderate, and the base station effects were 33.93% and 25.58% respectively. 3) The spatial distribution of soil organic matter and total nitrogen showed a trend from southeast to northwest The soil organic matter mass fraction showed the pattern of Quercus acutissima woodland> black pine woodland> vegetable land> corn land> chestnut woodland> waste grassland under different land use patterns, while the total nitrogen mass fraction showed Quercus forest The results showed that the soil organic matter and total nitrogen content showed the higher elevations under different elevations, the greater the soil organic matter and total nitrogen content, the higher the soil Organic matter and total nitrogen mass fraction in different slopes from high to low showed a shady slope> half slope> sunny slope pattern.