地形和土地利用决定的土壤水分和土壤有机碳(Soil Organic Carbon,SOC)的空间分布格局为研究水碳关系提供了重要的线索,但土壤水分的强变异性和SOC的相对稳定性对土壤水碳关系的研究提出了挑战。研究基于陆地水量平衡角度,选择雨季后土壤水分恢复期在晋西黄土丘陵小流域尺度进行了重复采样,按照3种地貌类型(沟底、沟坡、峁坡)和3种土地利用方式(农地、林地、草地)共布置37个样点,采集0～100 cm土壤样品测定土壤水分和SOC,探讨土壤水分与SOC分布特征及其相互关系。结果表明:同一土地利用方式下,土壤水分和SOC总体上沟底>沟坡>峁坡;同一地貌类型下,土壤水分农地>草地>林地,SOC农地<草地<林地。SOC与土壤水分呈现正相关关系,二者符合指数增长(y=y0+log a×ax,y为SOC,x为土壤水分)关系,因地貌部位和土地利用方式的不同决定系数在7%～37%之间变化。这一结果为基于土壤水分变化预测SOC积累和分布提供了参考。 Spatial distribution patterns of soil moisture and soil organic carbon (SOC) determined by topography and land use provide important clues for studying the relationship between water and carbon. However, the strong variability of soil moisture and the relative stability of SOC have negative impacts on soil water The research on carbon relations poses challenges. Based on the balance of land water balance, the soil moisture recovery after rainy season was selected and repeated sampling was carried out on the scale of small watershed in the Loess Plateau in western Shanxi. According to the three types of landforms (ditch bottom, ditch slope and slope slope) and three land use types 37 plots were collected and the soil samples were collected from 0 ~ 100 cm soil to determine the soil moisture and SOC. The distribution of soil moisture and SOC and their correlations were also discussed. The results showed that under the same land use pattern, soil moisture and SOC were mainly on the base of ditch> gully> slope; under the same landform type, soil moisture farmland> grassland> forest land, SOC farmland