Elsevier

Pedosphere

Volume 28, Issue 1, February 2018, Pages 103-113
Pedosphere

Soil Respiration of Biologically-Crusted Soils in Response to Simulated Precipitation Pulses in the Tengger Desert, Northern China

https://doi.org/10.1016/S1002-0160(17)60307-2Get rights and content

Abstract

Soil respiration (SR) is a major process of carbon loss from dryland soils, and it is closely linked to precipitation which often occurs as a discrete episodic event. However, knowledge on the dynamic patterns of SR of biologically-crusted soils in response to precipitation pulses remains limited. In this study, we investigated CO2 emissions from a moss-crusted soil (MCS) and a cyanobacteria-lichen-crusted soil (CLCS) after 2, 4, 8, 16, and 32 mm precipitation during the dry season in the Tengger Desert, northern China. Results showed that 2 h after precipitation, the SR rates of both MCS and CLCS increased up to 18-fold compared with those before rewetting, and then gradually declined to background levels; the decrease was faster at lower precipitation amount and slower at higher precipitation amount. The peak and average SR rates over the first 2 h in MCS increased with increasing precipitation amount, but did not vary in CLCS. Total CO2 emission during the experiment (72 h) ranged from 1.35 to 5.67 g C m−2 in MCS, and from 1.11 to 3.19 g C m−2 in CLCS. Peak and average SR rates, as well as total carbon loss, were greater in MCS than in CLCS. Soil respiration rates of both MCS and CLCS were logarithmically correlated with gravimetric soil water content. Comparisons of SR among different precipitation events, together with the analysis of long-term precipitation data, suggest that small-size precipitation events have the potential for large short-term carbon losses, and that biological soil crusts might significantly contribute to soil CO2 emission in the water-limited desert ecosystem.

References (52)

  • A D Thomas et al.

    Carbon dioxide fluxes from biologically-crusted Kalahari Sands after simulated wetting

    J Arid Environ

    (2010)
  • A D Thomas et al.

    Soil respiration at five sites along the Kalahari Transect: Effects of temperature, precipitation pulses and biological soil crust cover

    Geoderma

    (2011)
  • A D Thomas et al.

    Carbon dioxide fluxes from cyanobacteria crusted soils in the Kalahari

    Appl Soil Ecol

    (2008)
  • X P Wang et al.

    Effects of rainfall characteristics on infiltration and redistribution patterns in revegetation-stabilized desert ecosystems

    J Hydrol

    (2008)
  • A T Austin et al.

    Water pulses and biogeochemical cycles in arid and semiarid ecosystems

    Oecologia

    (2004)
  • J Belnap et al.

    Biological Soil Crusts: Structure, Function, and Management

    (2003)
  • H F Birch

    The effect of soil drying on humus decomposition and nitrogen availability

    Plant Soil

    (1958)
  • D R Bowling et al.

    Rain pulse response of soil CO2 exchange by biological soil crusts and grasslands of the semiarid Colorado Plateau, United States

    J Geophysi Res

    (2011)
  • J M Cable et al.

    Precipitation pulse size effects on Sonoran Desert soil microbial crusts

    Oecologia

    (2004)
  • J M Cable et al.

    Soil texture drives responses of soil respiration to precipitation pulses in the Sonoran Desert: implications for climate change

    Ecosystems

    (2008)
  • A P Castillo-Monroy et al.

    Biological soil crust microsites are the main contributor to soil respiration in a semiarid ecosystem

    Ecosystems

    (2011)
  • S P Chen et al.

    Responses of soil respiration to simulated precipitation pulses in semiarid steppe under different grazing regimes

    J Plant Ecol

    (2008)
  • R T Conant et al.

    Environmental factors controlling soil respiration in three semiarid ecosystems

    Soil Sci Soc Am J

    (2000)
  • P M Cox et al.

    Acceleration of global warming due to carbon-cycle feedbacks in a coupled climate model

    Nature

    (2000)
  • B P Degens et al.

    Repeated wet-dry cycles do not accelerate the mineralization of organic C involved in the macro-aggregation of a sandy loam soil

    Plant Soil

    (1995)
  • P A Fay et al.

    Changes in grassland ecosystem function due to extreme rainfall events: implication for responses to climate change

    Glob Change Biol

    (2008)
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