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Nitrogen Availability as a Control Mechanism of Secondary Succession Within a Semiarid Shrubland Ecosystem

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Title	Nitrogen Availability as a Control Mechanism of Secondary Succession Within a Semiarid Shrubland Ecosystem
Description	Study conducted by Edward F. Redente and Terry McLendon that consisted three experiments on four plots in the Piceance Basin of northwest Colorado. The study highlights the effect nitrogen availability has on the secondary succession of plant communities in semi-arid shrubland.
Abstract	Three experiments were conducted within a semiarid shrubland to test the role of nitrogen (N) availability as a control mechanism in secondary succession. Secondary succession patterns were documented for seven years and effects of increased and decreased N availability levels, fumigation, and competition by early-seral species were tested. Differential responses by seral species were determined and related to succession patterns. Nitrogen availability was found to be a primary mechanism controlling the rate of succession. Relative growth rate was an important factor determining which species initially dominated and N availability became the primary control factor by the third year. As N availability increased, the rate of succession decreased. Conversely, as N availability was decreased, the rate of succession increased. The abundance of annuals was increased and abundance of perennials decreased by increased N availability. Tissue N concentration was related to lifeform and seral position, and these relationships were important in the transition from early- to mid-seral stages. Decomposer subsystem dynamics were correlated with seral community dynamics. The effect of fumigation was minimized by initially planting with late-seral species. A conceptual model of secondary succession is presented based on N availability, relative growth rate, lifeform, and decomposition dynamics.
Subject	Soils -- Nitrogen content Shrubland ecology
Creator	Redente, Edward F. McLendon, Terry
Publisher	Made available by: Utah State University, Merrill-Cazier Library
Language	en
Rights	This is a government document and may be used without restriction.
Date Digital	2007-11-07
Material Type	Reports Government documents Electronic books
Type	Text
Format	Text/pdf
Conversion Specifications	Pdf file uploaded from USU Government Documents Collection.
Identifier	DE93000384.pdf
Search Date	1992-09-25

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