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Showing 1 to 20 of 28 for “"root respiration"”.
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Studies of Onion Root Respiration
No abstract prepared.
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Belowground Carbon Budget and Nutrient Uptake of Temperate Forest Species in Response to Elevated Carbon Dioxide and Temperature
… ecosystems is lost from belowground through root respiration. Maintenance respiration of attached fine roots was measured on mature loblolly pine and sweetgum (Liquidambar styraciflua ) growing in atmospheric CO2 elevated by 200 mu1 1 -1 above ambient. Fine root maintenance respiration on a …
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Root-zone temperature effects on the nutrient uptake of horticultural crops
… horticulture crops often are subject to root-zone temperatures (RZT) that exceed 30C, but little is known about the effects of supraoptimal RZT on nutrient absorption. In my first study, I determined the amount of phosphorus (P), zinc (Zn), and manganese (Mn) in tomato (Lycopersicon …
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Effects of Air vs. Air+Soil Heating During a Simulated Heat Wave on White Oak (Quercus alba) and Black Oak (Quercus velutina)
… manipulated the temperature of both shoots and roots separately for both white and black oak seedlings by insulating the soil during heat-stress to the shoot (35 <i>vs.</i> 40°C for 4 days, white oak; 35°C for 8 days, black oak). Interestingly, at moderate heat-stress temperature (35°C), net …
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The effect of bush clearing on soil respiration in north-central Namibia: Cheetah conservation fund and Erichsfelde
… in vegetation or land use that affects soil respiration are a major concern for global climate change. Bush clearing in north-central Namibia has been used as a solution to problems of bush encroachment. However, the effect of bush clearing on soil processes, such as the carbon cycle and soil …
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The Short-term Effects of Fertilization on Total Soil CO2 Efflux, Heterotrophic, and Autotrophic Respiration of Loblolly Pine (Pinus taeda L.)
… soil CO2 efflux (EC), heterotrophic (RH), and root respiration (RR) in response to fertilization with diammonium phosphate (DAP). Respiratory components were measured prior to fertilization, weekly following fertilization, and bi-weekly after respiratory components stabilized using a dynamic …
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Time of application and rate of depletion of sprinkler irrigation water for selected crops
… production and indicated a lack of oxygen for root respiration. 3. The rate of depletion of soil moisture was greater for alfalfa than for corn, wheat or burley tobacco; therefore the peak use frequency was less for alfalfa than for the other crops. 4. Burley tobacco appeared to be more …
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Environmental And Stand Variables Influencing Soil CO2 Efflux Across The Managed Range Of Loblolly Pine
… a component of that total efflux, heterotrophic respiration index (Rh), from data collected across the managed range of loblolly pine in the Southeastern U.S. We also performed tests of significance on controlled subsets of these data for the effects of fertilization and of thinning. Finally, we …
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Environmental and developmental regulation of carbon cycling in a warm-temperate forest
… on ecosystem C loss via autotrophic respiration (Ra), I measured rates of fine root respiration at the Duke Free Air CO2 Enrichment (FACE) experiment, the longest running ecosystem level CO2 experiment in a forest. Fine roots were investigated because their respiration was known to …
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Exploring the role of auxin in phenotypic plasticity in Arabidopsis thaliana root development
… the initiation and emergence of lateral roots. In this study we used several approaches to reduce auxin transport moving either from the shoot toward the root apex or from the root tip toward the base and examined the effect of these treatments on lateral root initiation and emergence. …
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The combined effects of salinity and sulfide on the growth and physiology of the freshwater marsh plant Pancium hemitomon J.A. Schultes
… growth stimulation in adventitious root production was inhibited at elevated salinities. After 39 weeks, elevated salinity at all concentrations was so stressful that the long-term effects of sulfide became inconsequential. Root respiration under anaerobic conditions was higher under …
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Dormancy and sprout control in root and tuber crops
… enhanced sprout length and number in sweetpotato roots and sprout growth was decreased by 20 ml/L piccolo (GA synthesis inhibitor). Continuous application of 10 ppm ethylene or greater prevented sprouting in sweetpotato roots over 4 weeks storage at 25° C. Sprout growth was also inhibited by 1000 …
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Genetics by Nutrient Availability Interactions on Short-term Carbon Pools and Fluxes in Young Pinus taeda Plantations
… of contributing factors (heterotrophic or root respiration) also changing (Chapter 5). Overall, logging residue incorporation increased total system C gain per ha more than did fertilization alone, but there were differences between genotypes planted (Chapter 6). Data from the field …
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Quantification and Physiology of Carbon Dynamics in Intensively Managed Loblolly Pine (Pinus taeda L.)
… (1) investigating environmental, soil C, root, and stand influences on soil CO2 efflux on the South Carolina coastal plain and (2) quantifying soil CO2 efflux over a rotation in loblolly pine stands located on the South Carolina coastal plain and the Virginia piedmont. In relation to the …
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Organic-Input Impacts on Soil Carbon Flux, Storage, and Budget in Conservation Agricultural Soils, Central Washington, USA
… entered the soil nor impacted the microbial and root respiration rates. Additionally, compared to prior measurements, there was significant C loss in the previously composted vegetable garden, suggesting that increases in soil C from compost amendments are not permanent. Using the higher …
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Greenhouse gas fluxes and root productivity in a switchgrass and loblolly pine intercropping system for bioenergy production
… and switchgrass. RS is primarily the result of root respiration (RA) and microbial decomposition of organic matter (RH) releasing CO₂ as a by-product and is an important and large part of the global carbon (C) cycle. Accurate estimates of the two components of total soil respiration (RS) are …
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Soil Carbon Dioxide Efflux Across Four Age Classes of Plantation Loblolly Pine (Pinus taeda L.) on the Virginia Piedmont
… dioxide efflux resulting from microbial and root respiration is a major component of the forest carbon cycle. We undertook this investigation to better understand the nature of soil carbon dioxide efflux of plantation loblolly pine, an important ecological and economical resource in the …
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Ozone effects on red oak root dynamics
… foliage damaged by ozone would decrease fine-root production and turnover. The red oak trees and seedlings were fumigated for three years with three levels of ozone (subambient, ambient, and 2X ambient) in open-top chambers. After two seasons of exposure, 2X ozone (0.082 ppm 7hr-mean conc.) …
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