1 / 16

Elizabeth Traver University of Wyoming

Quantifying spatial patterns in time of transpiration in aspen, alder, and sugar maple dominated forests. Elizabeth Traver University of Wyoming. Why spatial transpiration?.

kelton
Download Presentation

Elizabeth Traver University of Wyoming

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Quantifying spatial patterns in time of transpiration in aspen, alder, and sugar maple dominated forests Elizabeth Traver University of Wyoming

  2. Why spatial transpiration? • There is solid evidence that VPD is a major driver of transpiration in time, but it does not explain the variable spatial patterns within species. • Stands of trees tend to be more heterogeneous than homogeneous, with significant boundary areas--what causes these spatial patterns? • Finding the--possibly edaphic—causes of these spatial patterns, we can use that knowledge to scale up to larger, heterogeneous landscapes.

  3. Hypotheses • VPD explains the temporal variability in spatial autocorrelation of transpiration. • At high VPD, edaphic conditions will explain the spatial autocorrelation of variability in transpiration total N impacts on root properties soil texture impacts on root cavitation

  4. Sites • Aspen—Alder: SE of the WLEF tower • 120 m by 120 m with 144 plots in a 3/7 cyclic design • Runs from wetlands in NW to dry upland in SE • Sugar Maple—Red Pine: NW of the WLEF tower • 120 m by 120 m with 144 plots in a 3/7 cyclic design • Mostly sugar maple crossed by swath of red pine

  5. Sugar Maple-Red Pine site Aspen-Alder site WLEF Tower

  6. 3/7 Cyclic sampling design.

  7. Methods • Measure sap flux spatially -- Granier: constant heat flux sensors • Measure or acquire environmental factors -- micrometeorology from WLEF tower: μ, Q, rh, temp • Measure soil characteristics within the 3/7 cyclic plots already established • Soil moisture curves • Soil texture • Total N • Intra-tree scaling -- Asap • Spatial sampling/analysis -- cyclic, ‘variograms, geostatistics, GIS

  8. Various measurements and instruments in action

  9. Ewers et al. 2006 Ag For Met

  10. Nugget, sill, and range of transpiration plotted against VPD. As transpiration variation increases with VPD, spatial autocorrelation decreases. (Data from the aspen-alder stand.)

  11. Future work Using what is already known about the temporal variability of transpiration, look at edaphic conditions to explain the spatial variability.

More Related