Nitrogen Dynamics in the Sagebrush Steppe
Author | : Roger Long |
Publisher | : |
Total Pages | : 59 |
Release | : 2016 |
Genre | : |
ISBN | : |
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Author | : Roger Long |
Publisher | : |
Total Pages | : 59 |
Release | : 2016 |
Genre | : |
ISBN | : |
Author | : Amy N. Morris |
Publisher | : |
Total Pages | : 196 |
Release | : 2001 |
Genre | : Nitrification |
ISBN | : |
Author | : Erin Goergen |
Publisher | : |
Total Pages | : 11 |
Release | : 2003 |
Genre | : |
ISBN | : |
Author | : Ann L. Hild |
Publisher | : |
Total Pages | : 240 |
Release | : 2004 |
Genre | : Germination |
ISBN | : |
Author | : Jayne Belnap |
Publisher | : Springer Science & Business Media |
Total Pages | : 496 |
Release | : 2013-12-01 |
Genre | : Science |
ISBN | : 3642564755 |
In arid lands, where vegetation is sparse or absent, the open ground is not bare but generally covered by a community of small, highly specialized organisms. Cyanobacteria, algae, microfungi, lichens, and bryophytes aggregate soil particles to form a coherent skin - the biological soil crust. It stabilizes and protects the soil surface from erosion by wind and water, influences water runoff and infiltration, and contributes nitrogen and carbon to desert soils. Soil surface disturbance, such as heavy livestock grazing, human trampling or off-road vehicles, breaks up the fragile soil crust, thus compromising its stability, structure, and productivity. This book is the first synthesis of the biology of soil crusts and their importance as an ecosystem component. Composition and functioning of different soil-crust types are discussed, and case studies are used to show the impact of crusts on landscape hydrology, soil stability, nutrient cycles, and land management.
Author | : Nicole M. DeCrappeo |
Publisher | : |
Total Pages | : 276 |
Release | : 2011 |
Genre | : Cheatgrass brome |
ISBN | : |
Sagebrush steppe ecosystems in the Great Basin have become increasingly threatened by the proliferation of cheatgrass (Bromus tectorum L.), an invasive annual grass. Diverse sagebrush and perennial bunchgrass landscapes can be converted to homogenous cheatgrass grasslands mainly through the effects of fire. Although the consequences of this conversion are well understood in the context of plant community dynamics, information on changes to soil communities has not been well documented. I characterized soil surface, microbial, and nematode community dynamics in sagebrush steppe and cheatgrass-invaded areas across the northern Great Basin. I also examined how restoration treatments, such as seeding with a low impact rangeland drill and applying herbicide or sugar to plots, affected soil communities. Soil community functional diversity and structure were alike at sites where soil pH and percent bare ground were similar. Rangeland drill seeding and associated human trampling decreased biological soil crust cover at sites with high proportions of cyanobacteria. Herbicide treatments had little effect on soil communities, but addition of sugar to plots increased carbohydrate utilization and fungal biomass of cheatgrass- invaded soils. In studying paired intact and cheatgrass-invaded sagebrush plots, I found that microbial functional diversity and community composition were different in sagebrush, bunchgrass, cheatgrass, and interspace soils. Fungal biomass and species richness were highest under sagebrush and decreased under cheatgrass. To examine how soil community shifts might affect ecosystem processes, I investigated the contribution of fungi to inorganic nitrogen (N) mineralization in sagebrush and cheatgrass rhizospheres. Results from a 15N pool dilution experiment modified with the fungal protein synthesis inhibitor cycloheximide showed that gross and net N cycling rates did not differ between control sagebrush and cheatgrass soils and that fungi were important for gross NH4+ production and consumption in both soil types. However, net nitrification increased in sagebrush soils after 24 h, suggesting that when organic matter decomposition by fungi ceased bacteria became carbon limited and could no longer assimilate NH4+. These studies demonstrate that cheatgrass invasion into sagebrush steppe ecosystems can bring about significant changes to soil communities and that these changes may have repercussions for ecosystem functioning in the northern Great Basin.
Author | : Heather Ann Bechtold |
Publisher | : |
Total Pages | : 126 |
Release | : 2005 |
Genre | : Big sagebrush |
ISBN | : |
Concentrations of total N and C were 39% higher below shrub canopies. Seven years after shrubs were removed, soil N and C concentrations remained higher in areas where shrubs previously were than in open interspace areas. Because nitrogen is a limiting resource for plant growth, persistence of resource islands may facilitate shrub re-establishment patterns after disturbances that removed shrubs.
Author | : Bruce P. Van Haveren |
Publisher | : |
Total Pages | : 2 |
Release | : 2000 |
Genre | : Ground cover plants |
ISBN | : |
Author | : Elizabeth C. Colket |
Publisher | : |
Total Pages | : 288 |
Release | : 2003 |
Genre | : Big sagebrush |
ISBN | : |
Author | : Thomas A. Monaco |
Publisher | : CABI |
Total Pages | : 204 |
Release | : 2012-01-01 |
Genre | : Invasive plants |
ISBN | : 9781845938895 |
Bringing together ecology and management of invasive plants within natural and agricultural ecosystems, this book bridges the knowledge gap between the processes operating within ecosystems and the practices used to prevent, contain, control and eradicate invasive plant species. The book targets key processes that can be managed, the impact of invasive plants on these ecosystem processes and illustrates how adopting ecologically based principles can influence the ecosystem and lead to effective land management. It is suitable for researchers, practitioners and students of ecology, invasive spe.