Do Hummocks Provide a Physiological Advantage to Even the Most Flood Tolerant of Tidal Freshwater Trees?
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- 作者：Jamie A. Duberstein (1)
Ken W. Krauss (2)
William H. Conner (1)
William C. Bridges Jr. (3)
Victor B. Shelburne (4) - 关键词：Taxodium distichum ; Baldcypress ; Flooding ; Hummock maintenance ; Microtopography ; Sapflow ; Tidal freshwater swamp
- 刊名：Wetlands
- 出版年：2013
- 出版时间：June 2013
- 年：2013
- 卷：33
- 期：3
- 页码：399-408
- 全文大小：566KB
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Ken W. Krauss (2)
William H. Conner (1)
William C. Bridges Jr. (3)
Victor B. Shelburne (4)
1. Baruch Institute of Coastal Ecology and Forest Science, Clemson University, P.O. Box 596, Georgetown, 29442, USA
2. U.S. Geological Survey, National Wetlands Research Center, Lafayette, USA
3. Mathematical Sciences, Clemson University, Clemson, USA
4. College of Agriculture, Forestry, and Life Sciences, Clemson University, Clemson, USA - ISSN：1943-6246
文摘
Hummock and hollow microtopography is pervasive in tidal freshwater swamps. Many tree species grow atop hummocks significantly more than in hollows, leading to the hypothesis that hummocks provide preferred locations for maximizing physiological proficiency of inhabiting trees that experience repeated flooding. We used thermal dissipation probes to measure the ecophysiological proficiency of a very flood-tolerant tree, Taxodium distichum, as manifested through in-situ changes in sapflow (a proxy for transpiration) in 11 trees on hummocks and 11 trees in hollows. Overall, sapflow increased significantly by 3.3?g H2O m??s? (11?%) in trees on both hummocks and hollows during flooding, contrary to our expectations. We found no significant differences in sapflow rates between T. distichum trees positioned on hummocks versus hollows in relation to discrete flood events. Coincidentally, hummock elevations were equivalent to the flood depths that promoted greatest physiological proficiency in T. distichum, suggesting a physiological role for the maintenance of hummock height in tidal swamps. While we reject our original hypotheses that flooding and positioning in hollows will reduce sapflow in T. distichum, this research reveals a potentially important feedback between hummock height, flood depth, and maximum tree physiological response.