Download or read book Dissolved Organic Carbon DOC Production from Cultivated Organic Soils on Twitchell Island Sacramento San Joaquin Delta California written by Kenneth K. Tanji and published by . This book was released on 1999 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissolved Organic Carbon DOC and Trihalomethane THM Production of Cultivated Peat Soil from the Sacramento San Joaquin Delta California written by Alex Tat-Shing Chow and published by . This book was released on 2000 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book dissolved organic carbon concentrations and compositions and trihalomethane formation potentials in waters from agricultural peat soils sacramento san joaquin delta california implications for drinking water quality written by and published by DIANE Publishing. This book was released on with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissolved Organic Carbon Concentrations and Compositions and Trihalomethane Formation Potentials in Waters from Agricultural Peat Soils Sacramento San Joaquin Delta California written by Roger Fujii and published by . This book was released on 1998 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water Resources Center Report written by and published by . This book was released on 1998 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissolved Organic Carbon Concentrations and Compositions and Trihalomethane Formation Potentials in Waters from Agricultural Peat Soils Sacramento San Joaquin Delta California written by Roger Fujii and published by . This book was released on 1998 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report Water Resources Center University of California written by and published by . This book was released on 2000 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Report written by California Water Resources Center and published by . This book was released on 1998 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissolved Organic Carbon Release from Mineral Soils and Sediments in an Irrigated Agricultural System written by Sandrine J. Matiasek and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water interactions with soil and vegetation are greatly altered in agricultural watersheds compared to natural landscapes, which impacts sources and fates of organic carbon (OC). While mineral soil horizons in natural ecosystems primarily act as filters for dissolved organic carbon (DOC) leached from organic surface horizons, tilled soils largely lack an organic horizon and their mineral horizons therefore act as a source for both DOC and sediment to surface waters. Irrigated watersheds highlight this difference, as DOC and total suspended sediment (TSS) concentrations simultaneously increase during the low-discharge irrigation season, suggesting that sediment-associated OC may constitute a significant source of DOC. While DOC solubilized from sediments and soils has been found to be compositionally similar to stream DOC, the contributions of mineral-bound OC solubilization to agricultural streams remain poorly quantified. To address this, we conducted abiotic solubilization experiments using sediments (suspended and bed) and soils from an irrigated agricultural watershed in northern California, USA. Sediments (R2 > 0.99) and soils (0.74

Download or read book Production Et Devenir Des Mati res Organiques Dissoutes Dans Les Hydrosyst mes Faiblement Anthropis s written by Anthony Gauthier and published by . This book was released on 2009 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dissolved organic matter (DOM) is an essential parameter of quality and aquatic ecosystem functioning. The production of DOM in soils and its fate as it moves through the catchment were studied during experiments conducted at different scales, from the soil microcosm to the catchment, using natural abundance tracing of stable carbon isotopes (13C). At the catchment scale, we highlighted the role of wetlands in the formation of dissolved organic carbon (DOC). During discharge events we nevertheless observed the mobilisation of several sources of DOC to feed rivers. During laboratory experiments, we demonstrated that forest type influences the fate of water extractable organic carbon content in soil. The substitution of native forests by Douglas plantations reduces carbon inputs into the soil and mineralisation rates of soil organic carbon, which also depend on temperature. However, the water extractable organic carbon content of forest soils, which is influenced by the forest type, depends neither on carbon mineralisation rate nor temperature. We have therefore concluded that in the surface horizons of forest soils, the DOC mainly originates, not from the decomposition of soil organic matter but rather, from the vegetation via litter leachate.

Download or read book Hydrologic Treatments Affect Gaseous Carbon Loss from Organic Soils Twitchell Island California October 1995 December 1997 written by Robin L. Miller and published by . This book was released on 2000 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biologically Relevant Characteristics of Dissolved Organic Carbon DOC from Soil written by Susan Bowen and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Of the organic matter in soils typically

Download or read book The Role of Dissolved Organic Carbon in the Terrestrial Carbon Cycle written by Jonathan Sanderman and published by . This book was released on 2007 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sources and Fates of Dissolved Organic Carbon in Rural and Urban Watersheds in Brazos County Texas written by Danielle Cioce and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Bryan/College Station (B/CS) region has been reported to have elevated concentrations of dissolved organic carbon (DOC) in surface water. Increased DOC concentrations are worrisome as DOC has been shown to be an energy source for the recovery and regrowth of E. coli and many watersheds are impaired by high bacteria levels. To examine the sources and fates of DOC in rural and urban regions to better understand DOC movement though the environment, seven watersheds were studied. To investigate source, streams were analyzed using diffuse reflectance near infrared spectroscopy (DR-NIR) and carbon isotopes. Fate of DOC was determined through monthly streams samples, gathered between March 2011 and February 2012, which were incubated for biodegradable DOC (BDOC). Soil in the region was sampled based on land use categories. Soil was analyzed for DOC and BDOC as well as DOC adsorption, the other major fate of DOC. Above ground vegetation was sampled in conjunction with soil and analyzed for BDOC. Data indicated that fecal matter from cliff swallows provided considerable organic material to streams in the B/CS region as shown through DR-NIR. Carbon isotope values in streams ranged from -23.5 +/- 0.7% to -26.8 +/- 0.5%. Stream spectra may be able to predict carbon isotope values in streams (Adj. R2 = 0.88). Mean annual stream DOC concentrations ranged from 11 +/- 3 mg/L to 31 +/- 12 mg/L, which represents a significant decrease in DOC between 2007 and 2011. Concurrent increases in pH and conductivity were also recorded. The decrease in DOC and the increases in pH and conductivity may be due to impacts of high sodium irrigation tap water. Biodegradable DOC was low in streams, which is likely due to DOC being present in streams in refractory forms that are resistant to microbial breakdown. Soil chemistry, including soil adsorption, was greatly influenced by sodium. The elevated adsorption coefficients and release values seen in highly developed and urban open areas can be attributed to frequent exposure to high sodium irrigation water. The results indicate that sodium is a major driver of DOC in the system. Sound management decisions concerning irrigation water chemistry and urban development might eventually emerge to protect water quality as a result of this research.

Download or read book Dissolved Organic Carbon and Disinfection By product Precursors in Waters of the Chickahominy River Basin Virginia and Implications for Public Supply written by Gary K. Speiran and published by . This book was released on 2000 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sources and Cycling of Dissolved Organic Carbon Across a Landscape of Arctic Delta Lakes written by Suzanne E. Tank and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dissolved organic carbon (DOC) is a key regulator of aquatic ecosystems, and the primary substrate for aquatic bacteria. However, variations in function between different DOC sources are rarely studied. Arctic Mackenzie Delta lakes exhibit striking differences in DOC composition, with DOC sources ranging from C produced as a byproduct of aquatic plant (macrophyte) photosynthesis, to C derived from permafrost melting (thermokarst), and C delivered to lakes via river-water. This study assessed how variations in DOC source regulate the composition of the within-lake pool, drive bacterial metabolism and the contribution of bacterial biomass to higher trophic levels, and affect CO2 flux from Delta lakes. DOC-specific tracers showed macrophyte-derived DOC to comprise less than 15% of the DOC pool in macrophyte-rich lakes, despite macrophyte C levels 7-12-fold greater than total DOC. However, bacterial 13C indicated that bacteria preferentially incorporate DOC generated by macrophytes, while surveys and incubation experiments showed that bacterial metabolism is rapid on macrophytic DOC, with high rates of bacterial biomass production relative to respiratory loss as CO2. Accordingly, 13C, 15N, and fatty acid biomarkers demonstrated that zooplankton from macrophyte-rich lakes receive a greater proportion of their biomass from bacterial organic matter than zooplankton from other lake types. At the same time, however, experiments indicated that the high pH resulting from rapid photosynthesis in macrophyte-rich lakes can decrease the rate of bacterial metabolism over the short-term, and increase CO2 respiration at the expense of bacterial biomass production. In contrast, DOC-specific tracers indicated that thermokarst-derived DOC accumulates in lakes. Incubation experiments and In situ surveys revealed thermokarst DOC to be a relatively poor bacterial substrate, which resulted in proportionately more CO2 respiration, relative to bacterial biomass production, than observed for other Delta DOC sources. Moreover, multi-year surveys demonstrated that thermokarst lakes exhibit high levels of CO2 emission, despite clear undersaturation in other lakes, presumably because permafrost-derived DOC was largely respired by bacteria. Understanding the divergent roles played by the contrasting sources of DOC to Delta lakes both adds insight to the functioning of other lake regions, globally, and helps clarify the effect of climate-induced changes in DOC on northern lakes.

Download or read book Characterization of Dissolved Organic Carbon written by Shawn P. McElmurry and published by . This book was released on 2008 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: