Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

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

(202) 205-8333

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

Publication Information

View PDF (1.1 MB)

Title: Determinants of total and available phosphorus in forested Alfisols and Ultisols of the Ozark Highlands, USA

Author: Singh, Gurbir; Goyne, Keith W.; Kabrick, John M.;

Date: 2015

Source: Geoderma Regional. 5: 117-126.

Publication Series: Scientific Journal (JRNL)

Description: Phosphorus is an important nutrient limiting forest growth in many parts of world, and soil P forms and concentrations may be associated with a host of soil and environmental attributes in a complex soil landscape. The objective of this study was to identify key environmental and soil properties influencing total and available soil P concentrations in a mixed oak (Quercus L.)-hickory (Carya Nutt.) forest ecosystem. Soil samples and soil characterization data were obtained from fifty pedons sampled at the Missouri Ozark Forest Ecosystem Project (MOFEP) located in south-central Missouri, USA. Additional soil chemical analyses were conducted to measure total P, available P (Mehlich-3 P and Bray-1 P), and citrate bicarbonate dithionite (CBD) extractable Fe, Al, and Mn content. Classification and regression tree (CART) analysis was applied to explain relationships between P concentrations and environmental and soil properties. Total P concentration in the soils studied ranged from 15.6 to 410 mg kg-1 and the range of available P concentration was 0.29 to 30.6 mg kg-1. The CART analysis identified variables, primarily soil attributes, explaining 48, 71, and 65% of the variability associated with total P, Mehlich-3 P, and Bray-1 P concentrations, respectively. Extractable Mn was the most important explanatory variable in all CART models (explaining 28-33% of soil P variation). The CART analysis provided a concise framework for coupling soil and environmental variables to understand and identify locations within a complex soil landscape that may be susceptible for nutrient depletion. Furthermore, findings of this research highlight a need to more thoroughly evaluate relationships between Mn and P forms and concentrations in soil.

Keywords: Alfisols, Available phosphorus, Classification and regression tree analysis, Forest soils, Soil nutrients, Total phosphorus, Ultisols

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.
  • This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
  • Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, if you notice any errors which make this publication unusable.



Singh, Gurbir; Goyne, Keith W.; Kabrick, John M. 2015. Determinants of total and available phosphorus in forested Alfisols and Ultisols of the Ozark Highlands, USA. Geoderma Regional. 5: 117-126.


 [ 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.