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利用描述性统计分析和地统计分析,对博尔塔拉河流域0—20cm深度土壤有机碳的空间分布特征进行了研究。结果表明:博尔塔拉河流域土壤有机碳符合正态分布;半方差函数分析表明,博河上部和下部有机碳较好地符合高斯模型分布,中部有机碳符合线型模型分布。块金值与基台值的比值表明博河上部土壤有机碳含量的空间相关性很弱,说明随机性因素(如施肥、耕作措施、种植制度等各种人为活动)引起的空间变异起主要作用;中部和下部土壤有机碳含量表现为中等空间相关性,表明结构性(如气候、母质、地形、土壤类型、自然因素等)因素和随机因素共同起作用。Kriging插值表明:(1)博尔塔拉河流域土壤有机碳的空间分布特征主要以斑块状为主,基本与耕地分布相吻合;(2)全流域最大值出现在下游,可能与耕作模式以及河流从上游携带大量营养物质,通过灌溉在下游土壤沉淀累积有关;(3)博乐市周边土壤有机碳含量最低,这可能主要与博乐市周围为城市和工业用地有关。
Using the descriptive statistical analysis and geostatistical analysis, the spatial distribution characteristics of soil organic carbon at the depth of 0-20cm in Bortala River Basin were studied. The results showed that the soil organic carbon in the Bortala River basin was in accordance with the normal distribution. The analysis of the semivariance function showed that the upper and lower organic carbon in the Bo River met the Gaussian model distribution and the middle organic carbon fitted the linear model. The ratio of nugget value to abutment value indicates that the spatial correlation of soil organic carbon content in the upper part of Bo River is weak, indicating that spatial variability caused by random factors (such as fertilization, tillage measures and planting systems) . The soil organic carbon content in the middle and lower parts showed a moderate spatial correlation, indicating that structural (such as climate, parent material, topography, soil type, natural factors, etc.) and random factors work together. Kriging interpolation shows that: (1) The spatial distribution of soil organic carbon in the Bortala River Basin is dominated by plaque, which is basically consistent with the distribution of arable land; (2) The maximum of the whole basin appears in the downstream, which may be related to tillage mode (3) The soil organic carbon content around Bole is the lowest, which may be mainly related to the city and industrial land surrounding Bole.