Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (253 KB)

Title: Actual Evapotranspiration (AET) and tree species richness in the eastern U.S.A.

Author: Fan, Weihong; Waring, Richard H.;

Date: 2009

Source: In: McWilliams, Will; Moisen, Gretchen; Czaplewski, Ray, comps. Forest Inventory and Analysis (FIA) Symposium 2008; October 21-23, 2008; Park City, UT. Proc. RMRS-P-56CD. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 13 p.

Publication Series: Proceedings (P)

   Note: This article is part of a larger document. View the larger document

Description: Although many studies confirm that competition and disturbance play important roles in determining tree diversity locally, climatic constraints become increasingly important at broader geographic scales. We evaluate the extent that annual actual evapotranspiration (AET) might account for observed variation in tree diversity across the entire eastern U.S. and within 24 Level III ecoregions designated by the Environmental Protection Agency. To estimate tree diversity, we extracted data from a total of 87,137 Forest Inventory and Analysis (FIA) survey plots. For each 1000 km2 cell with ≥15 plots, logarithmic functions were derived to predict the number of species encountered per hectare (equivalent to 17 fixed-radius plots). Across the region, tree diversity exhibited a humped-shaped pattern with AET (r2=0.49, P < 0.0001). Stratifying ecoregions by AET, which increases from north to south, winter temperature emerged as a significant variable where AET averaged <800 mm.yr-1, whereas summer temperature accounted for much of the variation where AET was between 800 to 950 mm.yr-1. In ecoregions with AET>1100 mm.yr-1, significant variation in tree diversity was associated with seasonal differences in precipitation. We conclude that across the eastern U.S., AET provides a reasonable prediction of regional variation in tree diversity, especially where AET is < 800 mm.yr-1.

Keywords: AET, AET stratification, tree species richness, tree diversity, level III ecoregions, FIA database, environmental variables of species diversity, the eastern US

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • You may send email to rmrspubrequest@fs.fed.us to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)

XML: View XML

Citation:


Fan, Weihong; Waring, Richard H. 2009. Actual Evapotranspiration (AET) and tree species richness in the eastern U.S.A. In: McWilliams, Will; Moisen, Gretchen; Czaplewski, Ray, comps. Forest Inventory and Analysis (FIA) Symposium 2008; October 21-23, 2008; Park City, UT. Proc. RMRS-P-56CD. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 13 p.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.