Biological soil crusts influence carbon release responses following rainfall in a temperate desert, northern China
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- 作者：Yang Zhao ; Xinrong Li ; Zhishang Zhang ; Yigang Hu ; Yongle Chen
- 关键词：Arid regions ; Biological soil crusts ; Extreme rainfall event ; Rainfall pattern ; Tengger Desert
- 刊名：Ecological Research
- 出版年：2014
- 出版时间：September 2014
- 年：2014
- 卷：29
- 期：5
- 页码：889-896
- 全文大小：469 KB
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52. Zhao Y, Li XR, Zhang ZS, Jia RL, Hu YG, Zhang P (2013) The effects of extreme rainfall events on carbon loss from biological soil crusts covered soil in fixed sand dunes in the Tengger Desert, northern China. Sci Cold Arid Reg 5:191-96 - 作者单位：Yang Zhao (1)
Xinrong Li (1)
Zhishang Zhang (1)
Yigang Hu (1)
Yongle Chen (1)
1. Shapotou Desert Research and Experimental Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, 320 Donggang West Road, Lanzhou, 730000, China - ISSN：1440-1703
文摘
How soil cover types and rainfall patterns influence carbon (C) release in temperate desert ecosystems has largely been unexplored. We removed intact crusts down to 10?cm from the Shapotou region, China, and measured them in PVC mesocosms, immediately after rainfall. C release rates were measured in soils with four cover types (moss-crusted soil, algae-crusted soil, mixed (composed of moss, algae, and lichen)-crusted soil, and mobile dune sand). We investigated seven different rainfall magnitudes (0-, 1-, 2-, 5-0, 10-5, 15-0, and >20?mm) under natural conditions. C release from all four BSCs increased with increasing rainfall amount. With a rainfall increase from 0 to 45?mm, carbon release amounts increased from 0.13?±?0.09 to 15.2?±?1.35?gC?m? in moss-crusted soil, 0.08?±?0.06 to 6.43?±?1.23?gC?m? in algae-crusted soil, 0.11?±?0.08 to 8.01?±?0.51?gC?m? in mixed-crusted soil, and 0.06?±?0.04 to 8.47?±?0.51?gC?m? in mobile dune sand, respectively. Immediately following heavy rainfall events (44.9?mm), moss-crusted soils showed significantly higher carbon release rates than algae- and mixed-crusted soils and mobile dune sands, which were 0.95?±?0.02, 0.30?±?0.03, 0.13?±?0.04, and 0.51?±?0.02?μmol?CO2?m??s?, respectively. Changes in rainfall patterns, especially large rain pulses (>10?mm) affect the contributions of different soil cover types to carbon release amounts; moss-crusted soils sustain higher respiration rates than other biological crusts after short-term extreme rainfall events.