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Plant Ecology

, Volume 215, Issue 3, pp 367–378 | Cite as

Plant litter effects on soil nutrient availability and vegetation dynamics: changes that occur when annual grasses invade shrub-steppe communities

  • Sheel BansalEmail author
  • Roger L. Sheley
  • Bob Blank
  • Edward A. Vasquez
Article

Abstract

Changes in the quantity and quality of plant litter occur in many ecosystems as they are invaded by exotic species, which impact soil nutrient cycling and plant community composition. Such changes in sagebrush-steppe communities are occurring with invasion of annual grasses (AG) into a perennial grass (PG) dominated system. We conducted a 5-year litter manipulation study located in the northern Great Basin, USA. Springtime litter was partially or completely removed in three communities with differing levels of invasion (invaded, mixed, and native) to determine how litter removal and litter biomass affected plant-available soil N and plant community composition. Litter biomass (prior to the removal treatment) was negatively correlated with plant-available N in the invaded community, but was positively correlated in the native community. Plant-available N had greater intra- and inter-annual fluctuations in the invaded compared to the mixed or native communities, but was not generally affected by removal treatments. Litter removal had negative effects on AG cover during a warm/dry year and negative effects on PG cover during a cool/wet year in the mixed community. Overall, the effectiveness of springtime litter manipulations on plant-available N were limited and weather dependent, and only removal treatments >75 % had effects on the plant community. Our study demonstrates how communities invaded by AGs have significantly increased temporal variability in nutrient cycling, which may decrease ecosystem stability. Further, we found that the ecological impacts from litter manipulation on sagebrush communities were dependent on the extent of AG invasion, the timing of removal, and seasonal precipitation.

Keywords

Bromus tectorum Climate Plant-available nitrogen Perennial bunchgrass Pseudoroegneriaspicata Structural equation modeling 

Notes

Acknowledgments

We thank B. Mackey for statistical advice and numerous field technicians, particularly B. Bingham, for assistance in the field. This research was funded through the USDA-Agricultural Research Service Areawide Project for Ecologically-based Invasive Plant Management of Annual Grasses in the Great Basin Ecosystem.

Supplementary material

11258_2014_307_MOESM1_ESM.pdf (261 kb)
Supplementary material 1 (PDF 260 kb)

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Copyright information

© Springer Science+Business Media Dordrecht (outside the USA) 2014

Authors and Affiliations

  • Sheel Bansal
    • 1
    • 4
    Email author
  • Roger L. Sheley
    • 1
  • Bob Blank
    • 2
  • Edward A. Vasquez
    • 3
  1. 1.USDA-Agricultural Research ServiceEastern Oregon Agricultural Research CenterBurnsUSA
  2. 2.USDA-Agricultural Research ServiceGreat Basin Rangeland Research UnitRenoUSA
  3. 3.Department of Forestry and Wildland ResourcesHumboldt State UniversityArcataUSA
  4. 4.USDA-Forest Service, Pacific Northwest Research StationOlympia Forestry Sciences LaboratoryOlympiaUSA

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