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Trees

, Volume 33, Issue 1, pp 139–151 | Cite as

Physiological response of mid-canopy sweetgum trees to overstory loblolly pine mortality

  • Nicole J. Hornslein
  • Courtney Siegert
  • Heidi J. RenningerEmail author
Original Article

Abstract

Key message

Increasing water use patterns were more spatially restricted than increased nitrogen in leaves and litterfall in mid-canopy sweetgum trees of varying proximity to overstory pines undergoing mortality.

Abstract

Ecosystem changes following selective mortality of individual trees can be difficult to predict and depend on the response of surviving trees in the ecosystem. In the southeastern United States, southern pine beetle (Dendroctonus frontalis Zimmermann) selectively attacks and kills southern pines, particularly loblolly pine (Pinus taeda L.) which is prevalent throughout the region. Loss of loblolly pine should alter water and nutrient cycling unless co-occurring species are able to compensate for this lost functioning. The goals of this study were to determine changes in water and nutrient uptake of sweetgum trees (Liquidambar styraciflua L.) adjacent to loblolly pines experiencing mortality from girdling. We found that sweetgums near girdled pines initially used significantly less water, then similar amounts of water, then more water than sweetgums near control pines as pines experienced mortality. Relationships between daily sapflow and the natural log of vapor pressure deficit also differed significantly across years in sweetgums near girdled pines but not sweetgums near control pines. For sweetgum trees in both locations, both leaf and litterfall nitrogen content were significantly higher in the pine mortality year compared with the previous pine girdling year. Together, these results suggest that changes in water use are more spatially restricted to the region near dying pines whereas sweetgums, regardless of location, benefited from the extra available nitrogen in the ecosystem.

Keywords

Disturbance Sapflow Pinus taeda Nutrient cycling Succession 

Notes

Acknowledgements

The authors thank J. Beard, T. Ciaramitaro, Z. Kassahun, K. Limpert, J. Riggins, S. Roberts, R. Rousseau, J. Tang for fieldwork assistance and use of equipment. This publication is a contribution of the Forest and Wildlife Research Center, Mississippi State University.

Funding

This work was funded by the National Institute of Food and Agriculture, U.S. Department of Agriculture, McIntire-Stennis projects (MISZ-399080 to HJR, MISZ-069390 to CMS).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Forestry, Box 9681Mississippi State UniversityMississippi StateUSA

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