Effects of phytogenic mound on overland flow pathway, hydraulic characteristics and soil water redistribution at a patch scale in the Loess Plateau of China

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2024-10-01 DOI:10.1016/j.catena.2024.108430

Rui Wang , Zhibao Dong , Zhengchao Zhou , Ning Wang , Huan Zhao

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引用次数: 0

Abstract

Phytogenic mounds are usually formed under plants that intercept wind and runoff-borne sediment in semiarid environments. These mounds may affect the water source-sink relationship between vegetation patches and interspace patches. However, the impact of phytogenic mound on this relationship and the associated hydrological processes between patches are not well understood. This study aims to assess the effects of phytogenic mound on overland flow pathways, flow hydraulics and soil water redistribution at the patch scale. Upslope inflow experiments were conducted on three different patchy slopes (Caragana korshinskii (CK), Hippophae rhamnoides (HR), and Artemisia gmelinil (AG)) in the Loess Plateau. Results indicated that, compared to soil physicochemical properties, the shape and size of the mounds played a more crucial role in the hydrological processes within the patches. Redundancy analysis and hierarchical partitioning analysis revealed that the most significant factors are mound height (11.16 %) and downslope angle of mound (13.77 %). Most mound parameters exhibited a significant negative correlation with water flowpath width. The effects of mound parameters on runoff hydraulics were highly complex and largely dependent on the flow pathways. The relationships between mound parameters and soil water variables were negative at the upper, middle and lower parts of the mound, but positive at the left part. Differences in soil water between before and after runoff experiments and soil water storage (SWS) at the upper and left parts of the mound were greater than at the middle and lower parts. Average SWS of AG (16.24 ± 3.48 mm) with smaller mound size was found to be greater than that of HR (14.27 ± 3.99 mm) and CK (13.25 ± 2.24 mm). With increasing mound size, the spatial differences in SWS among the four parts increased. Consequently, the water source-sink relationship between the interspace patch surrounding the mound and the vegetation patch on the mound weakened as the mound size increased.

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中国黄土高原植生丘对成片尺度径流路径、水力特征和土壤水分再分布的影响

植生丘通常是在半干旱环境中拦截风和径流携带的沉积物的植物下形成的。这些土丘可能会影响植被斑块和间隙斑块之间的水源-汇关系。然而，植生丘对这种关系以及斑块间相关水文过程的影响还不十分清楚。本研究旨在评估植生土堆在斑块尺度上对陆地流路径、流动水力学和土壤水重新分布的影响。在黄土高原三个不同的斑块斜坡（Caragana korshinskii（CK）、Hippophae rhamnoides（HR）和Artemisia gmelinil（AG））上进行了上坡流入实验。结果表明，与土壤理化性质相比，土丘的形状和大小对斑块内的水文过程起着更为关键的作用。冗余分析和层次划分分析表明，最重要的因素是土丘高度（11.16%）和土丘下坡角（13.77%）。大多数土丘参数与水流路径宽度呈明显的负相关。土丘参数对径流水力学的影响非常复杂，主要取决于水流路径。土丘参数与土壤水变量之间的关系在土丘的上部、中部和下部为负相关，而在左部为正相关。径流实验前后的土壤水分差异以及土丘上部和左部的土壤储水量（SWS）均大于中部和下部。发现土丘面积较小的 AG 的平均 SWS（16.24 ± 3.48 毫米）大于 HR（14.27 ± 3.99 毫米）和 CK（13.25 ± 2.24 毫米）。随着土丘大小的增加，四个部分的 SWS 空间差异也在增加。因此，随着土丘面积的增大，土丘周围的空间斑块与土丘上植被斑块之间的水源-汇关系减弱。

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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.