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Soil CO sub(2) concentration in biological soil crusts and its driving factors in a revegetated area of the Tengger Desert, Northern China
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Soil CO sub(2) concentration in biological soil crusts and its driving factors in a revegetated area of the Tengger Desert, Northern China
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Journal Article
Soil CO sub(2) concentration in biological soil crusts and its driving factors in a revegetated area of the Tengger Desert, Northern China
2014
Overview
Biological soil crusts (BSCs) are an important cover in arid desert landscapes, and have a profound effect on the CO sub(2) exchange in the desert system. Although a large number of studies have focused on the CO sub(2) flux at the soil-air interface, relatively few studies have examined the soil CO sub(2) concentration in individual layers of the soil profile. In this study, the spatiotemporal dynamics of CO sub(2) concentration throughout the soil profile under two typical BSCs (algae crusts and moss crusts) and its driving factors were examined in a revegetated sandy area of the Tengger Desert from Mar 2010 to Oct 2012. Our results showed that the mean values of the vertical soil CO sub(2) concentrations under algal crusts and moss crusts were 600-1,200 mu mol/mol at the 0-40 cm soil profiles and increased linearly with soil depth. Daily CO sub(2) concentrations showed a single-peak curve and often had a 1-2 h time delay after the maximum soil temperature. During the rainy season, the mean soil CO sub(2) concentration profile was 1,200-2,000 mu mol/mol, which was 2-5 times higher as compared to the dry season (400-800 mu mol/mol). Annually, soil moisture content was the key limiting factor of the soil CO sub(2) concentration, but at the daily time scale, soil temperature was the main limiting factor. Combined with infiltration depth of crusted soils, we predicted that precipitation of 10-15 mm was the most effective driving factor in arid desert regions.
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