漂白土壤区田间尺度有机碳空间变异研究

Field Scale Spatial Variation of Soil Organic Carbon in Bleached Soil Region

[目的]研究名山县城东乡漂白土壤区有机碳田间尺度下受地形因子影响的空间变异规律及其影响因素，从而为土地利用规划、农业生产管理提供科学依据。[方法]运用GIS技术和地统计学的基本原理和方法对名山县城东乡漂白土壤区的44个表层土壤（0～20cm）样点有机碳含量数据进行分析。[结果]研究区域土壤有机碳含量为（24．22±5．55）g／kg，具有较强变异性，变异系数为22．91％，其中最大值为37．77g／kg，最小值为8．47g／kg，平均值为24．22g／kg。[结论]有机碳空间分布与高程呈显著负相关关系，与坡度呈显著负相关关系，与坡向呈正相关关系，但是相关性不是很明显。

[ Objective ] The field scaled spatial variation patterns and its determinants affected by terrain factor of organic carbon in bleached soil area of East village Mingshan county were investigate so as to provide a scientific basis for land use planning, agricultural production and management. [ Method] Organic carbon content data of 44 top （0 ±20 cm） bleached soil samples of East village Mingshan county were ana- lyzed by employing basic geostatistical method and GIS technique. [ Result] Organic carbon content of soil which had strong variability, quoti- ety of variability occupies 22.91% , was （24.22 ± 5.55 ） g/kg in the study region, in which organic carbon has the maximum of 37.77 g/kg, the minimum of 8.47 g/kg,and the average of 24.22 g/kg. [Conclusion]The spatial distribution with organic carbon showed significant uega- five correlation with elevation, so it was the same correlation with slope, which had weak positive correlation with aspect.