Response of Soil Moisture in Shallow Depth to Stochastic Rainfall and Biological Crust in Revegetated Sand Dunes in the Tengger Desert, China

doi:10.7522/j.issn.1000-694X.2017.00027

Journal of Desert Research ›› 2018, Vol. 38 ›› Issue (3): 600-609.DOI: 10.7522/j.issn.1000-694X.2017.00027

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Response of Soil Moisture in Shallow Depth to Stochastic Rainfall and Biological Crust in Revegetated Sand Dunes in the Tengger Desert, China

Shi Wei^1,2, Wang Xinping¹, Zhang Yafeng¹

1. Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Chna;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2017-01-07 Revised:2017-03-31 Online:2018-05-20 Published:2018-11-06

Abstract

Abstract: An experiment to measure water balance associated with infiltration events was conducted on the revegetated sand dunes in the Tengger Desert, north-western China. We choose three land cover types (Moss dominated soil crust, Algae dominated soil crust and dune sand) to study the effects of land cover change on infiltration, soil water redistribution and evaporation under different conditions of rainfall events on 8^th July and 30^th September, 2015, respectively. The results showed that surface soil moisture changed remarkably at the early stage of rainfall occurrence with a sharp increase within three hours, whereas, soil moisture exhibited a slight fluctuation at the later stage of rainfall resulted from the decrease of soil water potential gradient. In general, the presence of moss and algae dominated soil crusts impede the rainfall infiltration, limiting the depth to which rainwater can infiltrate and/or redistribute. Furthermore, biological crust could increase evaporation. We may conclude that the land cover with different biological soil crust had significant effects on soil hydrological processes, inducing more shallow distributed soil water in the revegetated sand dunes.

Key words: cover type, rainfall events, wetting front, cumulative infiltration

CLC Number:

S152.7

Shi Wei, Wang Xinping, Zhang Yafeng. Response of Soil Moisture in Shallow Depth to Stochastic Rainfall and Biological Crust in Revegetated Sand Dunes in the Tengger Desert, China[J]. Journal of Desert Research, 2018, 38(3): 600-609.

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Response of Soil Moisture in Shallow Depth to Stochastic Rainfall and Biological Crust in Revegetated Sand Dunes in the Tengger Desert, China

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