黄土残塬沟壑区不同土地利用土壤优先流发育及其对有机碳垂向分布的影响OACHSSCD
Development of preferential flow in soil and its effects on vertical distribution of organic carbon under different land uses in the gully region of the Loess Plateau
土壤优先流是黄土残塬沟壑区影响水分迁移与碳分布的重要过程,但其在不同土地利用方式下的发育特征及对土壤有机碳垂向分布的作用机制尚不明确.以黄土高原残塬沟壑区蔡家川小流域为研究区域,利用染色示踪实验与图像处理技术相结合的方法,选取林地(刺槐、侧柏和侧柏+刺槐混交林)、草地(以羊茅草为主)、农田(高粱)三种土地利用类型,探究不同土地利用类型下土壤优先流发育及其对有机碳分布的影响.结果表明:(1)各样地中,染色面积比大小依次为侧柏+刺槐混交林(62.63％)、刺槐(56.08％)、侧柏(49.12％)、草地(42.00％)、农田(26.65％);草地和农田的染色路径分布较浅(主要分布于5-15 cm 土层),而林地的染色路径分布较深(主要分布于15-25 cm 土层);总体来看,林地优先流发育程度优于草地和农田,主要与植被根系分布及其影响的土壤结构密切相关;(2)优先流区可溶性有机碳(DOC)含量均显著高于基质流区,优先流路径对土壤DOC、有机碳(SOC)的平均贡献率分别为70.56％、2.16％.(3)土壤DOC与SOC均与染色面积比呈显著正相关,且与土壤砂粒含量、土壤孔隙度存在显著关系.研究表明,不同土地利用方式通过改变优先流发育特征,显著影响土壤水分迁移与有机碳在剖面中的分布格局,为理解黄土区水-碳耦合过程提供了理论支撑.
Soil preferential flow plays a crucial role in regulating water movement and carbon distribution in the gully region of the Loess Plateau.However,its development characteristics under different land use types and its mechanism of influence on the vertical distribution of soil organic carbon remain unclear.This study was conducted in the Caijiachuan watershed,located in the gully region of the Loess Plateau.By combining dye-tracing experiments with image processing techniques,three land use types-forestland(Robinia pseudoacacia L.,Platycladus orientalis,and mixed forest of Robinia pseudoacacia and Platycladus orientalis),grassland(dominated by Festuca ovina),and farmland(Sorghum bicolor)—were selected to investigate the development of soil preferential flow and its impact on organic carbon distribution under different land use types.The results showed that:(1)Among the sample sites,the dyed area ratio followed the order:mixed forest(62.63％)＞Robinia pseudoacacia(56.08％)＞Platycladus orientalis(49.12％)＞grassland(42.00％)＞farmland(26.65％).The dye paths in grassland and farmland were shallower(mainly distributed in the 5-15 cm soil layer),while those in forestland were deeper(mainly distributed in the 15-25 cm soil layer).Overall,the development of preferential flow was more pronounced in forestland compared to grassland and farmland,which is closely related to the distribution of vegetation roots and the soil structure.(2)Dissolved organic carbon(DOC)content in the preferential flow region was significantly higher than in the matrix flow region.On average,preferential flow paths contributed 70.56％and 2.16％to soil DOC and soil organic carbon(SOC),respectively.(3)Both soil DOC and SOC showed significant positive correlations with the dyed area ratio and were also significantly related to soil sand content and soil porosity.The study indicates that different land use types significantly influence soil water movement and the distribution patterns of organic carbon in the soil profile by altering the development characteristics of preferential flow,providing theoretical support for understanding the water-carbon coupling process in the Loess Plateau region.
谢佳威;梅雪梅;葛立博;张建军;马梅花;王高远;张超
郑州大学生态与环境学院河南省减污降碳协同工程技术研究中心,郑州 450001郑州大学生态与环境学院河南省减污降碳协同工程技术研究中心,郑州 450001郑州大学水利与交通工程学院,郑州 450001北京林业大学水土保持学院,山西吉县森林生态系统国家野外科学观测研究站,北京 100083郑州大学生态与环境学院河南省减污降碳协同工程技术研究中心,郑州 450001郑州大学生态与环境学院河南省减污降碳协同工程技术研究中心,郑州 450001郑州大学生态与环境学院河南省减污降碳协同工程技术研究中心,郑州 450001
土壤优先流植被恢复有机碳黄土高原
preferential flowvegetation restorationorganic carbonthe Loess Plateau
《生态学报》 2026 (11)
5995-6010,16
国家自然科学基金青年基金项目(32201627)中国博士后科学基金面上资助(2024M752948)河南省博士后科研资助项目(22120005)
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