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[1]Shi Xueqi,Cheng Jinhua,Guan Ning,et al.Influence of Root System on Preferential Flow in a Typical Forest Stand in Karst Region[J].Research of Soil and Water Conservation,2024,31(05):73-83.[doi:10.13869/j.cnki.rswc.2024.05.037]

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Influence of Root System on Preferential Flow in a Typical Forest Stand in Karst Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 05 Page number: 73-83 Column: Public date: 2024-08-10

Title:: Influence of Root System on Preferential Flow in a Typical Forest Stand in Karst Region

Author(s):: Shi Xueqi, Cheng Jinhua, Guan Ning, Hou Fang, Shen Ziya; (School of Soil and Water Conservation, Beijing Forest University, Beijing 100083, China)

Keywords:: soil and water conservation and desertification combating; root systems; woodlands; priority streams; karst

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2024.05.037

Abstract:: [Objective]The aims of this study are to reveal the characteristics of preferential flow and the influence of root system on it in southwest karst region, to clarify the influence of root system on the degree of preferential flow of different vegetation types, and to provide a basis for local vegetation restoration and water conservation. [Methods]Three typical forest types in Yunnan karst region were selected as the research objects. Field dye tracing and statistical analysis were combined to obtain the vertical and horizontal profile morphological characteristics of preferential flow and the dye area ratio. Combined with four root system parameters including root length density, root surface area density, root volume density, and root biomass density, the degree of preferential flow caused by root systems in different forest types was calculated using one-way analysis of variance, in order to determine the influence of root systems on preferential flow. [Results](1)The overall characteristics of the root systems in the three typical forest types were natural secondary forest>natural mixed forest>artificial pure forest.(2)The maximum dye depth in different forest types was 20—30 cm, showing a decreasing trend with increasing depth. Both the vertical and horizontal profiles reflected the lateral seepage of soil moisture.(3)The matrix flow appeared in the surface layer of soil, and the remaining dye profiles showed a downward flow pattern resembling fingers or funnels as the soil layer deepened, indicating obvious root paths. The preferential flow in the mixed forest mainly occurred through vertical infiltration, while the horizontal flow development degree was higher in pure forests. Among them, the pure natural forest had the highest preferential flow ratio and the smallest length index, indicating that a complex root structure could effectively enhance the depth of water movement in the soil.(4)The results of one-way analysis of variance between the root system parameters of the three typical forest types and the corresponding dye area all showed R²>0.8 at the level of p<0.05, indicating that the root system parameters were closely related to the development of preferential flow and had a promoting effect. [Conclusion]Root characteristics of the three typical forest stands are closely related to the development of the preferential flow and all of them promote the development of the preferential flow, but the correlation between the root indexes and the development of the preferential flow vary among different forest types. Root system indicators of natural secondary forests show negative correlations; root length density and root surface area density of planted pure forests show positive correlations, and root volume density and root biomass density show correlations; root system indicators of natural mixed forests show positive correlations.

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Last Update: 2024-08-10