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dc.contributor.authorDoherty, Stacey J.-
dc.contributor.authorLeGrand, Sandra L.-
dc.contributor.authorFoley, Karen L.-
dc.contributor.authorRosten, Shelby A.-
dc.contributor.authorJones, Robert M.-
dc.contributor.authorFisher, Andmorgan R.-
dc.contributor.authorSikaroodi, Masoumeh.-
dc.contributor.authorGillevet, Pat.-
dc.contributor.authorBarbato, Robyn A.-
dc.identifier.govdocERDC TR-18-11-
dc.descriptionTechnical Report-
dc.description.abstractMineral dust affects many of Earth’s processes (e.g., radiative forcing, nutrient distribution, and hydrology) and poses a risk to Army maneuverability and situational awareness. Understanding soil processes and how these relate to potential dust emission is of increasing concern as adverse effects of dust become more prevalent. Biological soil crusts (BSCs), commonly found at the soil surface in arid and semiarid regions of the world, protect soils from wind and water erosion. While there is a rich understanding of the behaviors of photosynthetic organisms within BSCs, they are only part of the community. Understanding the other component, the nonphotosynthetic microorganisms and their response to environmental stimuli (i.e., temperature and moisture), will improve dust forecasting models and cur-rent soil-stabilization methods. We conducted a laboratory incubation study to investigate the effects of simulated precipitation events and cooling on the nonphotosynthetic microbial community that made up approximately 40% of the bacterial community in our samples. Our results show how temperature and moisture influence the diversity and resilience of the microbial community and its structure.en_US
dc.description.sponsorshipUnited States. Office of the Assistant Secretary of the Army for Acquisition, Logistics, and Technology.en_US
dc.description.tableofcontentsAbstract ii Figures and Tables iv Preface v Acronyms and Abbreviations vi 1 Introduction 1 1.1 Background 1 1.2 Objective 2 1.3 Approach 3 2 Material and Methods 4 2.1 Sample collection 4 2.2 Incubation study 6 2.2.1 SEM imaging 8 2.2.2 Soil properties 8 2.2.3 Strength analysis 9 2.2.4 Respiration analysis 9 2.2.5 Molecular analysis and sequencing 9 3 Results 12 3.1 SEM imaging 12 3.2 Soil properties 13 3.3 Strength analysis 14 3.4 Respiration analysis 15 3.5 Microbial community composition 17 3.6 Regression models 21 4 Discussion 23 5 Conclusion 28 6 Future Work 29 References 30 Report Documentation Page-
dc.format.extent44 pages / 5.89 Mb-
dc.publisherCold Regions Research and Engineering Laboratory (U.S.)en_US
dc.publisherGeospatial Research Laboratory (U.S.)en_US
dc.publisherEngineer Research and Development Center (U.S.)en_US
dc.relation.ispartofseriesTechnical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC TR-18-11-
dc.rightsApproved for Public Release; Distribution is Unlimited-
dc.sourceThis Digital Resource was created in Microsoft Word and Adobe Acrobat-
dc.subjectMineral dustsen_US
dc.subjectSoil chemistryen_US
dc.subjectSoil crustingen_US
dc.subjectSoil mechanicsen_US
dc.subjectSoil stabilizationen_US
dc.titleHeterotrophic microbial communities in biological soil crusts : responses to temperature and precipitationen_US
Appears in Collections:Technical Report

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