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Plant and Soil

, Volume 351, Issue 1–2, pp 249–261 | Cite as

Temporal and spatial variation in how vegetation alters the soil moisture response to climate manipulation

  • Pierre Liancourt
  • Anarmaa Sharkhuu
  • Lkhagva Ariuntsetseg
  • Bazartseren Boldgiv
  • Brent R. Helliker
  • Alain F. Plante
  • Peter S. Petraitis
  • Brenda B. Casper
Regular Article

Abstract

Aims

Soil water balance, key for ecosystem processes, is determined by multiple factors, including precipitation, temperature, slope and vegetation. How these interact with climate change and the relevant time scale of the interactions are poorly understood. We investigated the interplay among climate change, local abiotic conditions (slope) and biotic factors (vegetation or not) on soil water balance in a steppe grassland on the south exposure of a northern Mongolia valley.

Methods

We manipulated climate using passive warming open top chambers (OTCs), similar to those used in other systems. Areas of bare ground were created inside the OTCs to explicitly evaluate the effect of vegetation on soil moisture and its dynamics. The experiment was set up at two topographic locations, a steep upper slope and a gentle lower slope. Volumetric soil moisture content was measured throughout each growing season in a small area where vegetation had been removed and where it was left intact both inside OTCs and in control plots. To account for OTCs intercepting some precipitation, we also examined treatment effects on soil drying rates.

Results

Vegetation and climate manipulation reduced soil moisture more strongly in the wetter of the two years and just after rains. Similarly, treatment effects were more pronounced on the wetter lower slope. Averaged across the growing season, climate manipulation did not affect soil water differentially in vegetated and unvegetated areas, but seasonal variation in the strengths of treatment effects and interactions between climate and vegetation reflected plant developmental phenology. Soil drying rate was faster on the drier upper slope or with vegetation and faster overall in the drier year. In the dry year 2010, soil drying was slower in OTCs, likely because of wind interception.

Conclusions

Monthly or seasonal averages of soil moisture would have provided poor information about the interplay among factors affecting soil water balance in this system. Our study illustrates the utility of experimentally examining the interaction between biotic and abiotic factors and considering relevant time scales when investigating the complex effects of climate change on ecosystem processes.

Keywords

OTC Removal experiment Slope Steppe grassland Time scale Vegetation Volumetric soil moisture content 

Notes

Acknowledgements

We acknowledge Philippe Choler for discussion and valuable comments on the early version of the manuscript, A. Mac-Rear Crerar and D. Song for comments and help in the field, R. Weeks and B. Nomin-Erdene for help for data collection. We are thankful to S. Undrakhbold and all the camp staff, the American and Mongolian undergrads who spent their summer in Dalbay. This research was done as part of the PIRE-Mongolia project and was supported by the U.S. National Science Foundation under Grant No. 0729786.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Pierre Liancourt
    • 1
  • Anarmaa Sharkhuu
    • 2
  • Lkhagva Ariuntsetseg
    • 3
    • 4
  • Bazartseren Boldgiv
    • 4
  • Brent R. Helliker
    • 1
  • Alain F. Plante
    • 2
  • Peter S. Petraitis
    • 1
  • Brenda B. Casper
    • 1
  1. 1.Department of BiologyUniversity of PennsylvaniaPhiladelphiaUSA
  2. 2.Department of Earth and Environmental ScienceUniversity of PennsylvaniaPhiladelphiaUSA
  3. 3.Department of BotanyUniversity of WyomingLaramieUSA
  4. 4.Department of EcologyNational University of MongoliaUlaanbaatarMongolia

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