辽西北不同沙化程度草地土壤优先流特征
Preferential flow characteristics of grasslands with different degrees of desertification in northwestern Liaoning province
摘要
Abstract
[Objective]Northwestern Liaoning province,as a typical ecologically vulnerable area on the southern edge of the Horqin Sandy Land,faces constraints on regional ecological reconstruction due to land desertification leading to soil erosion and inefficient water resource utilization.Soil preferential flow is a key process in regulating water and nutrient movement in this area,and its characteristics have essential guiding value for vegetation restoration and water resource management.[Methods]This study focused on the grasslands in northwestern Liaoning province with no desertification(ND),light desertification(LD),moderate desertification(MD),and heavy desertification(HD),and used dye tracing experiments to reveal the distribution and morphological variation patterns of preferential flow under the desertification gradient,and to clarify the mechanism of the impact of desertification on preferential flow.[Results]1)The horizontal distribution of soil preferential flow in desertified grasslands was predominantly bimodal,and the preferential flow pattern presented asymmetry.2)As the soil depth increased,the stained area ratio of preferential flow decreased.The matrix flow depth ranged from 10.22 cm to 27.78 cm,the maximum staining depth ranged from 54.78 cm to 56.11 cm,and the stained area ratio ranged from 46.80%to 63.87%.3)The variation of preferential flow stained patterns(paths)showed significant stratification.The variation coefficient of the stained area ratio in the 0-50 cm soil layer was relatively small,but it increased sharply below 50 cm,showing an activity gradient of"relatively stable-moderately active-active-rapidly changing"in the vertical direction,and the degree of desertification significantly reduced the activity of preferential flow.4)The stained area ratio was highly positively correlated with root indicators(P<0.01),with a correlation coefficient ranging from 0.31 to 0.65,where the root diameter had the most significant impact on preferential flow.[Conclusions]The desertification of grasslands will reduce the activity of preferential flow in the soil,and the root system is the main factor affecting the preferential flow in the desertified grasslands of northwestern Liaoning province.关键词
土地沙化/优先流/植被退化/沙化程度/辽西北风沙地Key words
land desertification/preferential flow/vegetation degradation/desertification degree/wind sandy land of northwestern Liaoning province分类
农业科技引用本文复制引用
高英旭,冯梦隆,任雷杰,吕刚..辽西北不同沙化程度草地土壤优先流特征[J].中国水土保持科学,2026,24(3):195-205,11.基金项目
辽宁省重点研发项目"辽东山区重度退化天然次生林生态修复与碳汇功能提升技术研究"(2024JH2/102500096) （2024JH2/102500096）
辽宁省应用基础研究计划项目"基于立地和林分结构调控的林下参提质增效技术研究与示范"(2023JH2/101300161) （2023JH2/101300161）
辽宁省教育厅基本科研项目"辽西北防沙带花生地风蚀防控关键技术研究"(LJ212410147029) Basic Scientific Research Project of Liaoning Provincial Key Research and Development Project"Research on Ecological Restoration and Carbon Sink Function Enhancement Technology for Severely Degraded Natural Secondary Forests in the Eastern Liaoning Mountains"(2024JH2/102500096).Liaoning Provincial Applied Basic Research Program Project"Research and Demonstration of Quality Improvement and Efficiency Enhancement Technology for Under-forest Ginseng Based on Site and Stand Structure Regulation"(2023JH2/101300161).Liaoning Provincial Department of Education"Research on Key Technologies for Wind Erosion Prevention and Control in Peanut Fields in the Sand Prevention Belt of Northwestern Liaoning"(LJ212410147029) （LJ212410147029）
