Soil respiration patterns and controls in limestone cedar glades

Plant and Soil
National Park Service (Stones River National Battlefield), Tennessee State University
By:  and 

Links

Abstract

Aims

Drivers of soil respiration (Rs) in rock outcrop ecosystems remain poorly understood. We investigated these drivers in limestone cedar glades, known for their concentrations of endemic plant species and for seasonal hydrologic extremes (xeric and saturated conditions), and compared our findings to those in temperate grasslands and semi-arid ecosystems.

Methods

We measured Rs, soil temperature (Ts), volumetric soil water content (SWC), soil organic matter (SOM), soil depth, and vegetation cover monthly over 16 mo and analyzed effects of these variables on Rs.

Results

Seasonally, Rs primarily tracked Ts(r2=0.77; P < 0.01); however Rs was depressed during a summer drought. SOM was highly variable spatially, and incorporating SOM effects into the Rs model dramativally improved model performance. Both shallow soil and sparse vegetation cover were also associated with lower Rs.

Conclusions

Soil depth, SOM, and vegetation cover were important drivers of Rs in limestone cedar glades. Seasonal Rs patterns reflected those for mesic temperate grasslands more than for semi-arid ecosystems, in that Rs primarily tracked temperature for most of the year.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Soil respiration patterns and controls in limestone cedar glades
Series title Plant and Soil
DOI 10.1007/s11104-014-2348-6
Volume 389
Issue 1-2
Year Published 2015
Language English
Publisher Kluwer Academic Publishers
Publisher location Dordrecht
Contributing office(s) Tennessee Water Science Center
Description 13
First page 157
Last page 169
Online Only (Y/N) N
Additional Online Files (Y/N) N