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 13 of 13 for “"net N mineralization"”.
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Plant species effects on soil organic matter turnover and nutrient release in forests and grasslands
… nitrogen pools, and ecosystem processes such as net N mineralization. My objective was to examine two possible effects of species on soil C and N dynamics; changes in organic matter quality and changes in soil aggregation. For several forest ecosystems, litter lignin:N ratio correlated negatively …
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Carbon and nitrogen mineralization in temperate forest soils at low temperatures
In the past, carbon (C) and nitrogen (N) mineralization in temperate forest soils was often considered negligible at low temperatures during the dormant season, which is questioned by recent findings. Climate models predict warmer winters but little is known about the temperature sensitivity of C …
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Estimating the Contributions of Soil and Cover Crop Nitrogen Mineralization for Corn
… was performed to compare carbon (C) and N mineralization from four different CCs {Cereal Rye (CR), Hairy vetch (HV), Crimson clover (Cc) and Rapeseed (R)} on a sandy loam soil. Destructive sampling was performed at 6 different sampling dates – 3, 7, 14, 28, 56 and 112 days. ANOVA test …
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Stover, tillage, and nitrogen management in continuous corn for grain, ethanol, and soil carbon
… stover remaining on the soil surface decreased net N mineralization. However, various soil C pools were negatively affected by stover removal, particularly in surface measurements (0 to 15 cm). In contrast, retaining corn stover increased soil C in the same depths. These results indicate that …
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Assessing the variability of soil nitrogen mineralization
… season, the spatial and temporal pattern of N mineralization was assessed on two central Kansas corn fields. Net N mineralization was measured in the field using a buried bag and a resin core method. A 60 m sampling grid was established on the field and the N mineralization was measured at each …
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Linking Carbon, Nitrogen, And Calcium Cycling In Northeastern U.S. Forests
… reductions in both soil basal respiration and net N mineralization, indicating that liming has altered C and N cycling within this ecosystem. I also investigated how soil exchangeable Ca concentrations influence dissolved organic C and N retention. Soils higher in exchangeable Ca tended to …
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The Contribution of Spawning Pacific-salmon to Nitrogen Fertility and Vegetation Nutrition during Riparian Primary Succession on an Expansive Floodplain of a Large River
… 30 years and soils were N-rich henceforth. Net N-mineralization on young alluvial bars only provided a small fraction of the colonizing forest's N requirement, whereas soils in older forests provided abundant N. Negative correlation between foliar C:N and soil N during the first 20 years of …
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The Contribution of Spawning Pacific-salmon to Nitrogen Fertility and Vegetation Nutrition during Riparian Primary Succession on an Expansive Floodplain of a Large River
… 30 years and soils were N-rich henceforth. Net N-mineralization on young alluvial bars only provided a small fraction of the colonizing forest's N requirement, whereas soils in older forests provided abundant N. Negative correlation between foliar C:N and soil N during the first 20 years of …
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Microbial diversity and activity in temperate forest and grassland ecosystems
… showed that the effect of tree species on net N mineralization was likely to be mediated through their effect on soil microbial biomass, reflecting their influence on organic matter content and carbon availability. Influence of tree species on nitrification (potential and relative) might be …
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Timber Harvesting and Site Preparation Effects on Soil Quality for Loblolly Pine Growing on the Lower Coastal Plain of South Carolina
… soil pH, ECEC, base saturation, available P, or net N mineralization with disturbance. The base saturation exceeded 80 % on all sites, with Ca saturation controlling soil pH. The high base saturation buffered any redox-induced changes in soil chemistry that would have resulted from disturbance. …
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Biochar Effects on Soil Microbial Biomass and Activity
… biochar chemical properties. The 13C nuclear magnetic resonance (NMR) spectra of biochars showed that conversion of labile C consitutents of biomass feedstocks to aromatic C structures increased with increasing pyrolysis temperature. Cation exchange capacity (CEC), basic cations, ammonium (NH4+) …
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Nutrient fluxes and soil microbial processes
… cations), soil microbial activities (net N mineralization, potential nitrification, basal respiration) and microbial biomass (microbial biomass C and N) were measured under broadleaves and spruce. Soil chemistry of this highly acid soil was improved, 11 years after conversion, through …
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The effect of spent mushroom compost on soil conditions and plant growth
… soil, and to describe this release using kinetic models; to compare leaching losses from SMC with those from inorganic fertilizer; and to develop practical guidelines for SMC use. The SMC investigated contained 1.8% N (of which 94% was organic), 0.8% P, 1.6% K, 1.3% S (of which 17% was …