Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"C4 grasses"”.
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High throughput phenotyping and quantitative genetics of leaf functional traits in C4 grasses
The challenge of meeting the global demand for food and fuel is exacerbated by the need to increase plant productivity to maintain aboveground biomass and crop yield in suboptimal and resource limited environments. Improving crop productivity without increased resource use requires greater in whole …
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Evolution and ecology of C4 grasses: insights from carbon isotope analysis of grass pollen grains
C4 grasses account for >25% of global primary productivity and dominate tropical, subtropical, and warm-temperate grassland ecosystems. Because of limitations of conventional morphological and geochemical proxies, identification of C4 grasses in the fossil record is difficult. Thus, testing …
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Determining the potential drivers of invasive C4 grasses at De Hoop Nature Reserve, South Africa
… In grassland the vegetation is exclusively C4 while the shrub and tree component is generally C3. Shrublands, in contrast, are predominantly C3, for both woody and herbaceous species, though there can be a small C4 sedge and grass component. The C4 grassy biomes dominate the warm season …
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Influence of climate and the expansion of C4 grasses on sequence-scale cyclicity and landscape development during the late Miocene to Pleistocene of West Texas.
The Neogene records a period of global climate change and terrestrial ecosystem evolution; however, little is known about whether these changes influenced sedimentary and soil forming processes. The late Miocene to Pleistocene Fort Hancock and Camp Rice Formations from two adjacent isolated basins, …
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Exploiting the Productivity of C4 Photosynthesis in Cool Temperate Climates: Mechanisms and Thresholds of Cold Tolerance in Miscanthus, Saccharum, and Spartina pectinata
Perennial grasses that use the C4 photosynthetic pathway are the best choice for terrestrial bioenergy and can help mitigate climate change. Much of the marginal land available for bioenergy occurs in cool temperate climates at high latitudes. To be productive in cool temperate climates, C4 …
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Vegetation Ecology and Fire Effects on Community Structure, Composition, and Diversity in a Barrens Remnant and a Flatwoods in Southern Illinois
… species compared to the former dominance of C4 species. Decline in C4 grasses occurred at both the fire-treatment and control areas. At MVF, numerous flatwoods sedges not recorded in baseline samples emerged from the seed bank; however, several typical flatwoods grass and forb species remain …
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A System Dynamics Model of Soil Carbon Stock and Flows in Grasslands Under Climate and Grazing Scenarios.
… thesis used four plant functional groups (C3 and C4 grasses, forbs, and legumes) as the base groups for the model. C4 grasses were not found in in the field study but served to test whether the model detected changes in sequestration when grassland composition is changed. The results demonstrated …
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Role of iron in the accumulation of glomalin, an arbuscular mycorrhizal fungal glycoprotein
… Concentration increases when C3 and C4 grasses are stressed from low nutrients and/or light but levels are at least 10-fold less than glomalin. Two chelated iron sources, FeEDDHA and FeEDTA, at three concentrations resulted in glomalin accumulation at least 75% lower than normal …
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Fossil C 4 plant signals in Southeast Atlantic Ocean continental margin sediments indicate climate-dependent vegetation changes on the adjacent continent
… climate dependent changes in the predominance of C4 or C3 land plants. Leaf waxes of 35 C4 grasses and three C3 grasses were analysed. These investigations revealed that C4 grass waxes have significantly higher compound-specific delta13C values, high contents of n-C31 and n-C33 alkanes and the …
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Future potential net primary production trends of contiguous United States rangelands
… a rise in NPP in the Great Plains mostly from c4 grasses driven primarily by an increase in temperature. Furthermore, it projects little to no change in The Great Basin driven by a combination of a slight increase in precipitation and maximum temperature.
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Future potential net primary production trends of contiguous United States rangelands
… a rise in NPP in the Great Plains mostly from c4 grasses driven primarily by an increase in temperature. Furthermore, it projects little to no change in The Great Basin driven by a combination of a slight increase in precipitation and maximum temperature.
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Marker development and genetic diversity in saccharum and miscanthus
… belong to the Andropogoneae, a tribe of C4 grasses that are known for their high efficiency of photosynthesis and biomass production. Understanding of the genomes of these two crops is important for finding ways to improve them for agriculture. Both sugarcane and Miscanthus have large …
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Comparing simple and complex native forage mixtures for grazing cattle in southwestern Saskatchewan
… production and nutritional qualities of C3 and C4 grass and legume species. Study two examined the in situ CP, NDF and DM disappearance of six selected species harvested in the fall. EDNDF and ADDM values did not differ (P>0.05) among C3 grasses. The C4 grasses had higher (P
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Ecophysiological responses of Themeda triandra Forsk. and other Southern African Câ‚„ grass species to increases in atmospheric COâ‚‚ concentrations
… dioxide (C02) concentrations on southern African C4 grass species, with respect to carbon assimilation and allocation, growth, and morphological development. Altered CO2-responsiveness with simultaneous exposure to other environmental influences was also assessed in order to estimate the impacts …
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The effect of timing of growing season drought on flowering of Andropogon gerardii
… is dictated by the phenology of the dominant C4 grasses, in particular Andropogon gerardii which can contribute >80% to ANPP in this ecosystem. It is predicted that precipitation periods with the greatest impact on the highly variable flowering rates of A. gerardii are likely to be …
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Disturbance, Functional Diversity and Ecosystem Processes: Does Species Identity Matter?
… physiology and effects on ecosystem processes (C4 grasses, C3 grasses, legumes, forbs, woody plants). My study showed that two distinct disturbances associated with military training, vehicle maneuvers, and fire; affect functional group abundance, within functional group richness, and total …
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Dietary ecology and niche separation among three closely related species (Parapapio jonesi, Pp. whitei and Pp. broomi) of South African Plio-Pleistocene Cercopithecoidea from Makapansgat Limeworks site
… Theropithecus darti indicated a predominantly C4 diet. Two overlapping dietary ecologies, loosely correlated to taxonomic groupings, were found within the genus Parapapio; specimens attributed to Pp. broomi tended to have C3-dominated diets with a larger rootstock component than Pp. whitei and …
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Impacts of meteorology-driven seed dispersal on plant migration : implications for future vegetation structure under changing climates
… is in the composition of tropical trees and C4 grasses in the Amazon and in Africa.
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Phenotypic and genetic variation in the architectural responses of a C4 grass to drought stress
Improvement of next generation C4 grass feedstocks is a promising avenue towards meeting the challenge of sustainably ensuring global food and fuel security in the face of climate change. C4 grasses are inherently resource use efficient, have a variety of food, fuel, and other industrial product …
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Biogeography and phylogenetics of grassland auchenorrhyncha
… formation of large contiguous grasslands, but as grasses were present for tens of millions of years prior to climatic conditions favoring grassland formation, these dates are reasonable. Each group was inferred to have invaded the New World, and in many lineages this invasion occurred …
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