生态学报2026，Vol.46Issue(11)：5995-6010,16.DOI:10.20103/j.stxb.202502130293
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
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
摘要
Abstract
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.关键词
土壤优先流/植被恢复/有机碳/黄土高原Key words
preferential flow/vegetation restoration/organic carbon/the Loess Plateau引用本文复制引用
谢佳威,梅雪梅,葛立博,张建军,马梅花,王高远,张超..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[J].生态学报,2026,46(11):5995-6010,16.基金项目
国家自然科学基金青年基金项目(32201627) （32201627）
中国博士后科学基金面上资助(2024M752948) （2024M752948）
河南省博士后科研资助项目(22120005) （22120005）
