Skip to main content
construction release_alert
Scholars@Duke will be undergoing maintenance April 11-15. Some features may be unavailable during this time.
cancel
Journal cover image

Long-term soil potassium availability from a Kanhapludult to an aggrading loblolly pine ecosystem

Publication ,  Journal Article
Markewitz, D; Richter, DD
Published in: Forest Ecology and Management
May 1, 2000

A long-term (1962 to 1990) forest biogeochemistry study in the southeastern Piedmont of the USA provided estimates of soil K release in response to forest regrowth. We investigated the sources of soil K that buffered the exchangeable K pools during forest growth and we estimated soil K release rates through greenhouse and acid extraction studies for comparison to our field estimate. In these acid Kanhapludults, derived from granitic-gneiss, the disparity between measured depletions of soil exchangeable K and estimated forest removals indicated a buffering of exchangeable K on the order of 0.31 kmol(c) ha-1 per year. Nonexchangeable K extracted by boiling with 1 M HNO3 exceeded exchangeable K by up to 40-fold. Non-exchangeable K was not depleted during the three decades of stand growth, however, thus was not the long-term source of exchangeable K buffering. Total K in these soils ranged from 0.4 to 3.8% by weight. Mineralogical data indicated a presence of hydroxy-interlayered vermiculite throughout the upper 4 m of soil for <2 μm clay fraction and a presence of micaceous minerals in the 2 to 45 μm silt fraction. XRD analysis of micaceous flakes extracted from 4 to 8 m in the soil indicated a presence of muscovite mica. Estimated K releases in the greenhouse and extraction studies were generally consistent with long-term results. The accumulation of K during two rotations of pine seedling growth in the greenhouse exceeded the measured depletions in exchangeable and non-exchangeable K over all soil depths tested by 0.007 to 0.026 cmol(c) kg-1. Potassium removal by sequential extraction/incubations with 1 mM HCl and 1 mM oxalic acid continued through 24 extractions and K recovered in extract solutions exceeded the sum of depletions in exchangeable and non-exchangeable K pools by 0.001 to 0.028 cmol(c) kg-1. These excess removals in plant uptake or solution recovery indicate a release of mineral K. Thirty-day extractions with H+-resins in both 1 mM HCl and 1 mM oxalic acid were well fit by the Elovich equation but were not well correlated with plant K uptake in the greenhouse study. The release rate coefficients ranged from 0.012 to 0.025(cmol(c) kg-1) h-1. Extrapolations to annual releases of K in the greenhouse and sequential extraction studies were a similar order of magnitude as long-term releases estimated at the long-term Calhoun plots. Surface soil (0 to 15 cm) releases ranged from 0.15 to 0.65 kmol(c) ha-1 per year while deeper soils ranged up to 1.54 kmol(c) ha-1 per year. Results indicate that soils similar to those at Calhoun that contain a similar micaceous and HIV component will be able to supply K at rates adequate to keep pace with demands of forest regrowth even under intensive forest management. (C) 2000 Elsevier Science B.V.

Duke Scholars

Published In

Forest Ecology and Management

DOI

ISSN

0378-1127

Publication Date

May 1, 2000

Volume

130

Issue

1-3

Start / End Page

109 / 129

Related Subject Headings

  • Forestry
  • 4102 Ecological applications
  • 3103 Ecology
  • 07 Agricultural and Veterinary Sciences
  • 06 Biological Sciences
  • 05 Environmental Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Markewitz, D., & Richter, D. D. (2000). Long-term soil potassium availability from a Kanhapludult to an aggrading loblolly pine ecosystem. Forest Ecology and Management, 130(1–3), 109–129. https://doi.org/10.1016/S0378-1127(99)00175-9
Markewitz, D., and D. D. Richter. “Long-term soil potassium availability from a Kanhapludult to an aggrading loblolly pine ecosystem.” Forest Ecology and Management 130, no. 1–3 (May 1, 2000): 109–29. https://doi.org/10.1016/S0378-1127(99)00175-9.
Markewitz D, Richter DD. Long-term soil potassium availability from a Kanhapludult to an aggrading loblolly pine ecosystem. Forest Ecology and Management. 2000 May 1;130(1–3):109–29.
Markewitz, D., and D. D. Richter. “Long-term soil potassium availability from a Kanhapludult to an aggrading loblolly pine ecosystem.” Forest Ecology and Management, vol. 130, no. 1–3, May 2000, pp. 109–29. Scopus, doi:10.1016/S0378-1127(99)00175-9.
Markewitz D, Richter DD. Long-term soil potassium availability from a Kanhapludult to an aggrading loblolly pine ecosystem. Forest Ecology and Management. 2000 May 1;130(1–3):109–129.
Journal cover image

Published In

Forest Ecology and Management

DOI

ISSN

0378-1127

Publication Date

May 1, 2000

Volume

130

Issue

1-3

Start / End Page

109 / 129

Related Subject Headings

  • Forestry
  • 4102 Ecological applications
  • 3103 Ecology
  • 07 Agricultural and Veterinary Sciences
  • 06 Biological Sciences
  • 05 Environmental Sciences