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| CO2 Efflux from Two Typies Biologically Crusted Soil in Response to Simulated Precipitation Pulses in the Tengger Desert |
| Zhao Rong1,2, Li Xiaojun1, Zhao Yang1, Yang Haotian1, Li Gang1 |
1. Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract In arid and semiarid region, soil water availability, which is closely related to precipitation, is the major driver of soil respiration. In this study, different simulated precipitations (5, 10, 20 mm) were applied to two biologically crusted soils to investigate soil CO2 efflux in response to precipitation pulse in these regions. The results showed that three levels of rainfall significantly stimulated CO2 efflux from both biologically crusted soils. However, the response patterns varied between crust types. After rainfall, the respiration rates of moss and algal overlying soils reached their maximum within 0.5 h and 2 h, respectively. The peak values were 43-58 and 21-25 times greater than the background levels. After it reached the peak, soil CO2 efflux gradually decreased and returned to background level. The peak and average respiration rates of moss crusted soils significantly increased with the amount of water added, while these parameters did not vary with experimental pulse in algae crusted soil. Total carbon release of both biologically crusted soils increased with precipitation size. Following the same amount of water addition, peak and average respiration rates as well as total carbon emissions of moss overlying soils were significantly greater than the algae ones. Our results suggest that biological soil crusts and precipitation can co-regulate soil CO2 efflux.
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Received: 20 December 2013
Published: 20 March 2015
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2015, Vol. 35 
