Open Access OJSS Glomalin and Soil Aggregation under Six Management Systems in the Northern Great Plains, USA

Authors

Kristine A. Nichols, USDA-ARS Northern Great Plains Research LaboratoryFollow
James Millar, USDA-ARS Northern Great Plains Research Laboratory

Date of this Version

2013

Citation

Open Journal of Soil Science, 2013, 3, 374-378; http://dx.doi.org/10.4236/ojss.2013.38043

Comments

U.S. Government Work

Abstract

The soil environment is linked to aboveground management including plant species composition, grazing intensity, lev-els of soil disturbance, residue management, and the length of time of a living plant is growing. Soil samples were col-lected under rangeland [native grass, rotational grazing (NGRG); tame grass, heavy grazing (TGRG); and tame grass, rotational grazing (TGHG)] and cropland [conventional till (CT); CT plus manure (CTM); and long term no till (NT)] systems. The rangeland systems were hypothesized to have higher glomalin content [measured as Bradford-reactive soil protein (BRSP)] and water stable aggregation (WSA) than the cropland systems. In addition, within both rangeland and cropland systems, BRSP and WSA were expected to decline with increased disturbance due to grazing or tillage and going from native to introduced plant species. Differences were detected for BRSP with NGRG and CTM having the highest values in range and cropland systems, respectively. However, the CTM system had higher BRSP values than one or both of the tame grass systems while the CT and NT systems had similar values. Correlation analysis showed strong relationships between all of the BRSP values and WSA.