植物根孔构型与土壤优先流过程研究进展

doi:10.16843/j.sswc.2023.02.014

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Abstract [Background] Root channels formed by the alive roots and rotten roots play an important role in increasing preferential flow and altering hydrological processes such as soil infiltration. The root channel architecture characteristics are very complex and difficult to describe accurately and quantitatively. The influence mechanisms of root channels on preferential flow infiltration process are theoretically beneficial to water resources management, groundwater pollution, landslides and mudslides prevention.[Methods] In view of this research hotspot, numerous literature retrieval were carried out with "root channels" "architecture characteristics" "preferential flow" "matrix infiltration" "soil infiltration" and "soil moisture" as keywords in the Web of Science and China National Knowledge Infrastructure (CNKI) databases. These keywords appeared very frequently in relevant fields. Representative literatures were selected for analysis and integration in the previous studies by the end of 2020. The influencing factors, quantitative measurement methods of plant root channel architecture were in detailed described, and the influences of root channel architecture on soil preferential flow infiltration process were discussed.[Results] 1) The biological and abiotic factors, such as plant species, planting time, soil properties, and management measures significantly influence root channel architecture and the mechanism of each influencing factor are still unclear. In the past, due to technical methods and other limitations, soil macropores from different sources were often studied together during the study of preferential flow, without separately considering the characteristics of plant root channels and their importance. 2) In recent years, it has become a trend to use CT scanning imaging technology to obtain three-dimensional parameters of root channel architecture, which can characterize the network structure of large pores from different sources (biopores and non-biopores) as a whole. 3) Preferential flow and soil matrix infiltration are the two forms of soil water infiltration. During soil infiltration process, preferential flow must be accompanied by soil matrix infiltration. Previous quantitative research methods of preferential flow cannot quantitatively partition the temporal preferential flow and matrix infiltration, resulting in very little quantitative research of preferential flow infiltration process. However, the macropore connectivity blocking method provide a practical solution for quantitatively partition the temporal preferential flow and soil matrix infiltration. 4) Plant root system may improve soil infiltration properties by forming root channels through its own decay and decomposition. The values of root channel numbers, area, volume, and diameter are significantly and positively correlated with the soil infiltration rates and preferential flow flux.[Conclusions] Therefore, in the future, the three-dimensional quantitative index system for root channel architecture should be established to reveal development mechanism and architecture characteristics of plant root channel. More efforts should be focused on the influence mechanisms of root channel architecture on soil preferential flow infiltration process. It will be an important research direction to deeply reveal the mechanism of soil preferential flow movement and its contribution to water infiltration.

Key words： plant root channel architecture characteristics soil preferential flow matrix infiltration soil infiltration soil moisture

Received: 30 September 2021

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	Articles by authors
	DUAN Jian
	WANG Lingyun
	WANG Ling
	YANG Jie
	WANG Jian
	TANG Chongjun
	ZHENG Haijin

Cite this article:

DUAN Jian,WANG Lingyun,WANG Ling, et al. A review of researches on plant root channel architecture and soil preferential flow process[J]. SSWC, 2023, 21(2): 117-123.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2023.02.014 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2023/V21/I2/117

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