+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Effect of dissolved organic carbon substrates on denitrification in subsurface soils

, : Effect of dissolved organic carbon substrates on denitrification in subsurface soils. Abstracts of the General Meeting of the American Society for Microbiology 102: 339

Nitrate removal from groundwater beneath riparian vegetation has been attributed to denitrification, but the carbon sources driving microbial metabolism in subsurface soils have not been investigated. Dissolved organic carbon (DOC) leaching from the root zone to deeper sediments is a likely source of C to support microbial metabolism. We compared the ability of natural dissolved organic carbon (DOC) and other defined substrates to promote denitrification in four saturated subsurface sediments (9.35 to 10 m depth). Soils amended with 50 mg of 15NO3-N per g soil were incubated for 89 days under anaerobic conditions. DOC extracted from shallow subsoil (1 to 2 m depth) and defined C substrates were added 39 days after nitrate addition at 30 mg C/g soil. DOC addition caused 12 to 30% reduction in nitrate concentration with 90% loss of the DOC. DOC half-lives ranged from 6 to 14 days. Nitrate concentrations remained constant in subsoils without added carbon substrates and DOC concentrations in untreated subsoils ranged between 1 and 20 mg C/g soil. Incorporation of 15N into microbial biomass or other organic forms was minimal. Denitrification was carbon limited; benzoate added at 300 mg C/g soil caused complete removal of nitrate in three sediments, but did not support any denitrification in the other sediment. The results show that DOC from soil can effectively support denitrification in subsoils below the root zone.


Other references

Shitaye, E.J.; Beran, V.; Svobodová, J.; Morávková, M.; Babák, V.; Pavlík, I., 2009: Comparison of the conventional culture, the manual fluorescent MGIT system and the automated fluorescent MGIT 960 culture system for the detection of Mycobacterium avium ssp. avium in tissues of naturally infected hens. Different methods for the detection of Mycobacterium avium ssp. avium (MAA) in naturally infected hens were compared. They included the conventional culture method (solid Herrold's and Stonebrink media and liquid Sula medium) and newly develo...

Elrod, J.W.; Laroux, F.S.; Bharwani, S.; Jordan, P.; Tubbs, J.; Hoffman, J.; Grisham, M.B.; Sasaki, M.; Alexander, J.S., 2002: STAT-6 knockout mice exhibit exacerbated injury in DSS-colitis. Gastroenterology 122(4 Suppl 1): A-268, April

Zhang, B.; Zhu, D.; Zhang, Y., 2011: Crystal-to-crystal transformation from a chain compound to a layered coordination polymer. Chemistry, An Asian Journal 6(6): 1367-1371

Seeman K.; Widrow L.; Yesavage J., 1984: Fantasized companions and suicidal depressions 2 case reports. American Journal of Psychotherapy 38(4): 541-557

Tolmacheva Tatiana, 2007: Middle and Upper Ordovician conodonts from drill cores of the Kaliningrad region. Rapporter och Meddelanden - Sveriges Geologiska Undersokning 128: 109

Tur Kaspa, I.; Maor, Y.; Weissenberg, R.; Madgar, I.; Aderka, D.; Dor, J.; Mashiach, S.; Wallach, D., 1996: High levels of soluble p55-TNF receptors in seminal and prostatic fluids of normal and infertile men. Purpose: To study the role of tumor necrosis factor (TNF) in the male reproductive system by examining the occurrence, source, and possible functional significance of soluble TNF receptors in seminal fluids of normal and infertile men. Materials a...

Shoamanesh, A.; Charidimou, A.; Sharma, M.; Hart, R.G., 2017: Should Patients With Ischemic Stroke or Transient Ischemic Attack With Atrial Fibrillation and Microbleeds be Anticoagulated?. Stroke

Weber, A.; Leibel, W.S., 2000: Multiple independent origin of mouthbrooding in South American Geophagine cichlids. Journal of the Pennsylvania Academy of Science 73(Suppl ): 183, March

Schönenberger, S.; Bösel, J., 2016: Reply from Schönenberger et al. to the letter from Kofke and Sharma regarding "Sedation vs. Intubation for Endovascular Stroke TreAtment (SIESTA) - a randomized monocentric trial". International Journal of Stroke 11(7): Np73-Np73

Anonymous, 2013: Assessment of genetic diversity in Horse gram Dolichos uniflorus. Twenty three horse gram accessions were studied during spring seasons of 2008a 09 and 2010a 1The results indicated significant differences among the 23 accessions for all characters studied, indicating the presence of sufficient genetic variation....