摘要
为了探索锡林河流域土壤有机碳的空间变异规律,基于半方差函数理论和普通克里格插值研究了0—10cm,20—30cm,40—50cm土壤有机碳变异特征及分布格局。结果表明,(1)0—10cm,20—30cm,40—50cm层土壤有机碳的最优拟合模型依次是高斯模型、高斯模型、指数模型。(2)随着土层深度的增加,土壤有机碳空间分布相关性增强,0—10cm层土壤有机碳存在中等空间分布相关性,20—30cm与40—50cm层土壤有机碳具有强烈的空间分布相关性,自相关距离分别为25.81km,20.26km,45.00km。(3)各向异性分析表明:各方向土壤有机碳变异程度随着土层深度增加而减弱,同层不同方向半方差变化明显,各向异性显著,不同层西南—东北45°方向以及东南—西北135°方向半方差变化最为明显,而各层45°方向变异程度却表现出相似性。(4)各层土壤有机碳分布具有一致性,流域南部边缘到东部以及东北部为土壤有机碳含量较高区域,北部、西北部以及上游的中南部是全流域土壤有机碳含量最低的区域,西部以及西南部土壤有机碳含量处于相对中等水平,流域地形与植被分布特征决定了土壤有机碳这种分布特点。
In order to explore the spatial variability of soil organic carbon in the Xilin River Basin,the variation characteristics and distribution pattern of 0—10 cm,20—30 cm,40—50 cm soil organic carbon were studied based on semivariance function theory and ordinary Kriging interpolation.The results showed that:(1)the best fitting models of soil organic carbon in 0—10 cm,20—30 cm and 40—50 cm layers were Gaussian model,Gaussian model and Exponential model;(2)with the increase of soil depth,the spatial distribution of soil organic carbon increased,the spatial distribution of soil organic carbon in 0—10 cm layer was moderate,and the spatial distribution of soil organic carbon in 20—30 cm and 40—50 cm layers had a strong spatial distribution correlation and autocorrelation distances were 25.81 km,20.26 km and 45.00 km,respectively;(3)anisotropy analysis showed that the variation degree of soil organic carbon in all directions was weakened with the increase of soil depth,and the half-variance of the same layer changed significantly in different directions,and the anisotropy was significant,the 45° direction from southwest to northeast and the southeast,the variance of the 45° direction showed the similarity;(4)the distribution of soil organic carbon in each layer was consistent;the soil organic carbon contents were higher in the southern part of the basin,in the north and north of the basin,and the middle and the south of the upper part of the basin.Soil organic carbon contents in the west and southwest was at the relatively moderate status,and topographic and vegetation distribution characteristics determine the distribution characteristics of soil organic carbon.
出处
《水土保持研究》
CSCD
北大核心
2017年第6期97-104,共8页
Research of Soil and Water Conservation
基金
国家自然科学基金"基于冰雪水转换过程与-植被-土壤水热互馈机制的牧草生物量模型构建"(51669018)
关键词
土壤有机碳
空间变异
地统计学
各向异性
soil organic carbon
spatial variability
geostatistics
anisotropy
