المؤلفون: Milchunas, Daniel G., author, Lauenroth, William K., author, Knapp, Alan K., author, Klein, Julia A., author, Conant, Richard T., author, Burke, Ingrid C., author, Brown, Cynthia S., author, Webb, Colleen T., author, Augustine, David J., author, Angert, Amy L., author, Kelly, Eugene F., author, Kaplan, Nicole E., author, Derner, Justin D., author, Antolin, Michael F., author, Moore, John C., author, Blumenthal, Dana M., author, Wallenstein, Matthew D., author, von Fischer, Joseph C., author, Stapp, Paul, author, Paustian, Keith H., author, Parton, William J., author, Morgan, Jack A., author, SGS-LTER, Colorado State University, publisher

مصطلحات موضوعية: long term ecological research, Central Plains Experimental Range, Pawnee National Grassland, grassland ecology, shortgrass steppe

الوصف: The SGS-LTER research site was established in 1980 by researchers at Colorado State University as part of a network of long-term research sites within the US LTER Network, supported by the National Science Foundation. Scientists within the Natural Resource Ecology Lab, Department of Forest and Rangeland Stewardship, Department of Soil and Crop Sciences, and Biology Department at CSU, California State Fullerton, USDA Agricultural Research Service, University of Northern Colorado, and the University of Wyoming, among others, have contributed to our understanding of the structure and functions of the shortgrass steppe and other diverse ecosystems across the network while maintaining a common mission and sharing expertise, data and infrastructure. ; Colorado State University. Natural Resource Ecology Laboratory; Colorado State University. Department of Forest and Rangeland Stewardship; Colorado State University. Department of Soil and Crop Sciences; Colorado State University. Department of Biology; California State University, Fullerton; United States. Agricultural Research Service; University of Northern Colorado. ; Poster presented at the LTER All Scientists Meeting held in Estes Park, CO on September 10-13, 2012.

وصف الملف: born digital; Presentation slides; posters; application/pdf

العلاقة: Presentations; http://hdl.handle.net/10217/85127Test

الإتاحة: http://hdl.handle.net/10217/85127Test

المؤلفون: Paul, Eldor A., author, Schultz, David J., author, Calderón, Francisco J., author, Soil Science Society of America, publisher

مصطلحات موضوعية: terrestrial ecosystems, plant nutrition, CO2, mycorrhizal association

الوصف: Radioactive tracers were used to study the C allocation to coarse and fine roots, aboveground plant tissues, mycorrhizal lipids, belowground respiration, and soil in a mycorrhizal association. Sorghum bicolor (L.) Moench was grown in soil with a nonmycorrhizal microbial inoculum with and without Glomus clarum, a mycorrhizal inoculant. Fifty-one-day-old mycorrhizal (M) and nonmycorrhizal (NM) plants were subjected to a 3-h exposure to 14CO2 and sequentially harvested after 52, 54, 57, 64, and 76 d. Mycorrhizal plants assimilated 21% more 14C than NM plants, even though they were slightly smaller in size. They also had a higher percentage and absolute allocation of 14C to root tissue, belowground respiration, and soil. Mycorrhizal roots had a higher content of total lipids and total fatty acids. The fungal fatty acid 16:1ω5, usually associated with arbuscular mycorrhizal fungi, comprised up to 29.5% of the total fatty acid content of M roots, while NM roots had only trace levels of this molecule. Thin-layer chromatography was used to separate the fatty acids extracted from the roots. The 14C of the various components was determined by radiography. The 14C mean residence time (MRT) of the mycorrhizal fatty acid 16:1ω5 was calculated at 7.1 d. The monoenoic, saturated, and total fatty acids had MRTs ranging from 11.1 to 14.3 d. The lipids of NM roots incorporated less 14C label. This underscores the difference in the lipid C cycle between the M and NM roots. Translocation of the 14C to soil was 6.3% of the photosynthesized C in the M plants relative to only 2.4% in the NM plants, giving an indication of its movement into the mycorrhizal hyphae as well as to the soil.

وصف الملف: born digital; articles; application/pdf

العلاقة: Faculty Publications; Calderón, Francisco J., David J. Schultz and Eldor A. Paul, Carbon Allocation, Belowground Transfers, and Lipid Turnover in a Plant–Microbial Association. Soil Science Society of America Journal 76, no. 5 (September 2012): 1614-1623. https://dx.doi.org/10.2136/sssaj2011.0440Test.; http://hdl.handle.net/10217/85540Test; https://dx.doi.org/10.2136/sssaj2011.0440Test

الإتاحة: https://doi.org/10.2136/sssaj2011.0440Test
http://hdl.handle.net/10217/85540Test

المؤلفون: Carsey, Kathy, author, Kittel, Gwen, author, Decker, Karin, author, Cooper, David J., author, Culver, Denise R., author, Colorado Natural Heritage Program, publisher

مصطلحات موضوعية: Wetland plants -- Colorado -- Identification, Riparian plants -- Colorado -- Identification, Plant communities -- Colorado

الوقت: Colorado

الوصف: March 2003. ; Includes bibliographical references and indexes. ; This guide covers 184 wetland and riparian associations occurring within the boundaries of Colorado. It includes a dichotomous key, and a two-page profile of each association which presents a photo, descriptive information, and a table of species cover values.

وصف الملف: born digital; field guides; application/pdf

العلاقة: Publications; http://hdl.handle.net/10217/47078Test

الإتاحة: http://hdl.handle.net/10217/47078Test

المؤلفون: Connor, David J., 1938-, author, Natural Resource Ecology Laboratory, Colorado State University, publisher

مصطلحات موضوعية: Grasslands -- United States

جغرافية الموضوع: United States

الوصف: Unpublished material prepared primarily for internal use in the US-IBP Grassland Biome Program. ; January 1973. ; On cover: Grassland Biome, Ecosystem analysis studies, U.S. International Biological Program.

وصف الملف: born digital; technical reports; application/pdf

العلاقة: International Biological Program (IBP) Technical Reports; Technical report (U.S. International Biological Program Grassland Biome), no 208; http://hdl.handle.net/10217/15858Test

الإتاحة: http://hdl.handle.net/10217/15858Test

المؤلفون: Klein, Kathleen C., editor, Williams, David J., editor, Colorado Water Resources Research Institute, Colorado State University, publisher

مصطلحات موضوعية: Water resources development -- South Platte River Valley (Colo. and Neb.) -- Congresses, Watershed management -- South Platte River Valley (Colo. and Neb.) -- Congresses, Resource allocation -- Congresses

الوقت: South Platte River Valley (Colo. and Neb.)

الوصف: Kathleen C. Klein, editor, David J. Williams, assistant editor. ; Partial proceedings of the 1993, [3rd], South Platte Forum. ; December 1993. ; Abstracts of papers presented. ; South Platte Forum (3rd: 1993: Fort Collins, Colo.).

وصف الملف: proceedings (reports); application/pdf

العلاقة: wwdl; Information Series; Information series (Colorado Water Resources Research Institute), no 76; is_76.pdf; CCRICWRI100063INSR; http://hdl.handle.net/10217/3151Test

الإتاحة: http://hdl.handle.net/10217/3151Test

المؤلفون: Graf, David, editor, Williams, David J., editor, Colorado Water Resources Research Institute, Colorado State University, publisher

مصطلحات موضوعية: Wildlife conservation -- South Platte River Valley (Colo. and Neb.) -- Congresses, Endangered species -- South Platte River Valley (Colo. and Neb.) -- Congresses, Habitat conservation -- South Platte River Valley (Colo. and Neb.) -- Congresses, Habitat (Ecology) -- South Platte River Valley (Colo. and Neb.) -- Congresses

الوقت: South Platte River Valley (Colo. and Neb.)

الوصف: David Graf, editor, David J. Williams, assistant editor. ; Abstracts of papers presented. ; South Platte Forum (6th: 1995: Greeley, Colo.).

وصف الملف: proceedings (reports); application/pdf

العلاقة: wwdl; Information Series; Information series (Colorado Water Resources Research Institute), no 81; is_81.pdf; CCRICWRI100067INSR; http://hdl.handle.net/10217/3155Test

الإتاحة: http://hdl.handle.net/10217/3155Test

المؤلفون: Klein, Kathleen C., editor, Williams, David J., editor, Colorado Water Resources Research Institute, Colorado State University, publisher

مصطلحات موضوعية: Water resources development -- South Platte River Valley (Colo. and Neb.) -- Congresses, Watershed management -- South Platte River Valley (Colo. and Neb.) -- Congresses, Integrated water development, Resource allocation -- Congresses

الوقت: South Platte River Valley (Colo. and Neb.)

الوصف: Kathleen C. Klein, editor, David J. Williams, assistant editor. ; Partial proceedings of the 1994, [4th], South Platte Forum. ; Abstracts of papers presented at the 4th South Platte Forum held on October 26-27, 1994 at the Ramkota Inn in Greeley, Colorado.

وصف الملف: abstracts (summaries); application/pdf

العلاقة: wwdl; Information Series; Information series (Colorado Water Resources Research Institute), no 77; is_77.pdf; CCRICWRI100064INSR; http://hdl.handle.net/10217/3152Test

الإتاحة: http://hdl.handle.net/10217/3152Test

المؤلفون: Schimelpfenig, David W., author, Cooper, David J., advisor, Sanderson, John S., committee member, Butters, Gregory, committee member

مصطلحات موضوعية: fen, soil properties, restoration, peat, hydrology

الوصف: 2012 Spring. ; Includes bibliographical references. ; Mountain sedge fens are unique ecosystems which require thousands of years to form, provide refuge for rare plant species, and are easily disturbed by human activity. Peatland soils are significant players in the global carbon cycle, storing 1/3 of the terrestrial carbon stock. Drained peat is a persistent source of atmospheric CO2, restoring the carbon storage function to disturbed peatlands is an increasingly important justification for peatland restoration. I measured water table dynamics and CO2 flux at three small fens (< 10 ha) in SW Colorado for one year before and one year after restoration. The fens were hydrologically restored with the installation of small check dams in ditches that had drained the sites for a century. Water tables in restored areas increased during the driest periods of the summer from -45 cm below the surface to -15 cm. We measured CO2 flux (net ecosystem exchange (NEE), ecosystem respiration (ER), and gross ecosystem photosynthesis (GEP)) bi-weekly during the two growing seasons using an infrared gas analyzer attached to a 60 x 60 x 60 cm closed chamber. Mean NEE over the two year study was lowest in the disturbed areas (-1.28 g CO2 m-2 hr-1). Mean NEE in the reference area was -1.74 g CO2 m-2 hr-1 and in the restored areas was -2.19. Mean ER was similar across treatments, ranging from 0.77 and 0.92 g CO2 m-2 hr-1. Soil samples were extracted from three fens restored during this study and 1 restored in 1990 to test the effects of long term drainage and restoration on the physical properties of peat soil including; bulk density, porosity, % organic matter (OM), residual water content, and saturated hydraulic conductivity. Disturbance has caused significant changes in the peat soil including; 25% reduction in soil OM, increased bulk density, decreased porosity, and reduced saturated hydraulic conductivity. These effects persist in peat soil 20 years after restoration. Calculated OM losses of 1.4 to 3.6 kg m-2 have resulted in ...

وصف الملف: born digital; masters theses; application/pdf

العلاقة: Schimelpfenig_colostate_0053N_10902.pdf; ETDF2012500099ECOL; http://hdl.handle.net/10217/66680Test

الإتاحة: http://hdl.handle.net/10217/66680Test

المؤلفون: Frock, David J., author, Lynham, Susan, advisor, McKelfresh, David, advisor, Smith, Ken, committee member, Warner, Mark, committee member

مصطلحات موضوعية: informal learning, organizational environments, student wellness, training and development, university administration

الوصف: 2014 Summer. ; To view the abstract, please see the full text of the document.

وصف الملف: born digital; doctoral dissertations; application/pdf

العلاقة: Frock_colostate_0053A_12475.pdf; http://hdl.handle.net/10217/83743Test

الإتاحة: http://hdl.handle.net/10217/83743Test

المؤلفون: Novlan, David J., author, Gray, William M., author, Department of Atmospheric Science, Colorado State University, publisher

مصطلحات موضوعية: Hurricanes, Tornadoes

الوصف: May 1973. ; Partially sponsored by NOAA N22-65-73(G). ; Partially sponsored by NSF GA-32589X1.

وصف الملف: reports; application/pdf

العلاقة: Catalog record number (MMS ID): 991023633709703361; QC852.C6 no.200; Atmospheric Science Papers (Blue Books); Atmospheric science paper, no. 200; http://hdl.handle.net/10217/270Test

الإتاحة: http://hdl.handle.net/10217/270Test