黄河源区高寒草甸鼠兔丘裸坡侵蚀水动力的微地形影响机制

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-05-26 DOI:10.1016/j.catena.2025.109158

Shengchun Tong , Guorong Li , Xilai Li , Jinfang Li , Yong Li , Dalin Yue , Jianyun Zhao , Haili Zhu , Yabin Liu , Wenting Chen , Xiasong Hu

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引用次数: 0

摘要

高原鼠兔的筑丘行为是导致西部黄河源区草甸退化和土壤侵蚀的重要因素之一，但微地形对鼠兔丘裸坡侵蚀水动力特性的影响机制尚不清楚。本研究通过模拟6个强度（均为60 min）的降雨事件，分析了鼠兔丘裸坡在亚降雨条件下的微地形和侵蚀水动力特征，并利用冗余分析（RDA）和结构方程模型（SEM）揭示了坡面微地形变化对侵蚀水动力的影响机制。结果表明：流域最大平均侵蚀深度为4.159 cm，最大侵蚀面积占径流地块总面积的93.40%；强烈的侵蚀主要发生在鼠丘的上半部分，沉积主要发生在鼠丘的下半部分。地表流速、流态参数和侵蚀功率参数均随降雨强度的增大而增大(P <；0.05)，阻力参数随降雨强度的增大呈下降趋势(P <；0.05);坡面流均为层流(Re <；500)，但在较高的降雨强度下由慢流过渡到快流。RDA结果表明，地表切割程度是影响地表径流量、产沙量和水动力参数的关键因素，雷诺数是表征径流量和产沙量的最佳水动力参数。SEM分析表明，微地形直接影响水蚀（路径系数为0.856）或通过水动力特性间接影响水蚀（路径系数= 0.742）。研究表明，坡面微地形对坡面水分侵蚀具有重要影响，并与坡面水动力特性密切相关，形成了一个高度复杂的动力交换过程。

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Influencing mechanism of microtopography on erosion hydrodynamics on bare slopes of pika mounds in alpine meadows in the Yellow River source area, Western China

The mound-building behavior of plateau pika is one of the important factors leading to meadow degradation and soil erosion in the Yellow River source area of Western China, but little is known about the influencing mechanism of microtopography on erosion hydrodynamic characteristics of bare slopes of pika mounds. In this study, we analyzed microtopography and erosion hydrodynamic characteristics on bare slopes of pika mounds under subrainfall conditions through simulation of rainfall events at six intensities (all lasting 60 min), and revealed the influencing mechanism of slope microtopographic changes on erosion hydrodynamics by using redundancy analysis (RDA) and structural equation modeling (SEM). The results showed that the maximum average erosion depth was 4.159 cm, and the maximum erosion areas accounted for 93.40 % of the total area of runoff plots; intense erosion took place mainly in the upper half of the pika mounds, while deposition was mainly limited to the lower half of the pika mounds. Surface flow velocity, flow regime parameters, and erosion power parameters all showed an increasing trend with rainfall intensity (P < 0.05), while the resistance parameters showed a decreasing trend with rainfall intensity (P < 0.05); all slope flows were laminar (Re < 500), but transitioned from slow flows to rapid flows at a higher rainfall intensity. The RDA results showed that surface cutting degree was the key factor influencing surface runoff volume and sediment yield and hydrodynamic parameters, and that the Reynolds number could be the best hydrodynamic parameter to characterize runoff volume and sediment yield. SEM analysis showed that microtopography influenced water erosion either directly (with a path coefficient of 0.856) or indirectly through hydrodynamic characteristics (path coefficient = 0.742). This research showed that microtopography of the bare slopes had a significant effect on water erosion, and was linked to hydrodynamic characteristics to build up a highly complex dynamic exchange process.

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.