Skip to Main Content
Weathering and vegetation effects in early stages of soil formationAuthor(s): Jonathan D. Phillips; Alice V. Turkington; Daniel A. Marion
Source: Catena, Vol. 72: 21-28
Publication Series: Scientific Journal (JRNL)
PDF: Download Publication (901 KB)
DescriptionBedrock surfaces in the Ouachita Mountains, Arkansas, exposed by spillway construction and which had not previously been subjected to surface weathering environments, developed 15?20 cm thick soil covers in less than three decades. All open bedrock joints showed evidence of weathering and biological activity. Rock surfaces and fragments also showed evidence of significant weathering alteration. The results suggest a soil production function whereby weathering and increases in thickness are initially rapid. The rapid initial rate (5 to 10 mm year−1) is facilitated by a weathering-favorable regional climate, local topography favoring moisture and sediment accumulation, and aggressive vegetation colonization. The ages of the trees on the bedrock benches suggests that a short period (b10 years) of pedogenic site preparation is necessary before trees can become established. Initial chemical weathering within newly-exposed rock fractures in resistant sandstone strata and chemical weathering of weak shale layers, coupled with accumulation of organic and mineral debris in fractures and microtopographic depressions facilitates plant establishment, which accelerates local weathering rates.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- 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.
CitationPhillips, Jonathan D.; Turkington, Alice V.; Marion, Daniel A. 2008. Weathering and vegetation effects in early stages of soil formation. Catena, Vol. 72: 21-28
Keywordsweathering, vegetation, pedogenesis, regolith, Ouchita mountains, feedbacks
- Contributions of water supply from the weathered bedrock zone to forest soil quality
- Nonequilibrium regolith thickness in the Ouachita Mountains
- Biomechanical effects of trees on soil and regolith: beyond treethrow
XML: View XML