Biocrust effects on soil infiltrability in the Mu Us Desert: soil hydraulic properties analysis and modeling

Title:

Biocrust effects on soil infiltrability in the Mu Us Desert: soil hydraulic properties analysis and modeling

Creator:

Guan, Hongjie and Liu, Xinyu

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:01067277-97c0-4e18-932f-761c635c65eb
uuid:01067277-97c0-4e18-932f-761c635c65eb
doi:10.2478/johh-2021-0026

Subject:

cyanobacteria, lichen, moss, infiltration, inverse approach, and hydraulic parameter

Type:

model:article and TEXT

Format:

počítač and online zdroj

Description:

The presence of biocrusts changes water infiltration in the Mu Us Desert. Knowledge of the hydraulic properties of biocrusts and parameterization of soil hydraulic properties are important to improve simulation of infiltration and soil water dynamics in vegetation-soil-water models. In this study, four treatments, including bare land with sporadic cyanobacterial biocrusts (BL), lichen-dominated biocrusts (LB), early-successional moss biocrusts (EMB), and latesuccessional moss biocrusts (LMB), were established to evaluate the effects of biocrust development on soil water infiltration in the Mu Us Desert, northwest of China. Moreover, a combined Wooding inverse approach was used for the estimation of soil hydraulic parameters. The results showed that infiltration rate followed the pattern BL > LB > EMB > LMB. Moreover, the LB, EMB, and LMB treatments had significantly lower infiltration rates than the BL treatment. The saturated soil moisture (θs) and shape parameter (αVG) for the EMB and LMB treatments were higher than that for the BL and LB treatments, although the difference among four treatments was insignificant. Water retention increased with biocrust development at high-pressure heads, whereas the opposite was observed at low-pressure heads. The development of biocrusts influences van Genuchten parameters, subsequently affects the water retention curve, and thereby alters available water in the biocrust layer. The findings regarding the parameterization of soil hydraulic properties have important implications for the simulation of eco-hydrological processes in dryland ecosystems.

Language:

Slovak

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

378-386

Source:

Journal of hydrology and hydromechanics | 2021 Volume:69 | Number:4

Harvested from:

CDK

Metadata only:

false