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| 1 | Dynamics of phosphorus in sediments of a naturally acidic lake显示文摘The mechanisms which controls the fixation and/or release of P in sediment of an extremely acidic lake(pH = 2.0 to 3.0) and its response to the influence of eutrophic urban waste water were investigated.The results,in the chemical composition,in the mineralogy of the sediment and in the material as obtained from sediment traps,show that the lake sediments are mainly volcanic material reflecting volcanic features of the basin.The sedimentation rate calculated for the lake(2.5×10^(-2) mg m^(-2) day^(-1)) was higher than that observed in other similar glacial lakes in both Andean Patagonia and also elsewhere in the world.The Total Phosphorus concentration in sediments was higher than figures reported by other authors for mining acid lakes,and the main fraction of P was found associated with organic matter.There was no control by Fe or Al on P,because both are in solution at pH < 3.0.It was concluded that changes in the natural input of nutrients(derivatives of Copahue volcano fluid,the discharge of sewage,or basin run-off) are responsible for a high concentration of SRP and N-NH_4^+ in the lake.Laboratory experiments showed that sediments have no ability to retain phosphorus and a continuous release of P from the sediments into the water column was observed.The assays where the pH was artificially increased showed that the P still remains in solution until at least pH 7.0.It was concluded that changes in the natural input of nutrients due to:1) the volcanic fluids,2) the increase in sewage charges,or 3) surface runoff upstream,maintain a high trophic state with high concentrations of dissolved P and N-NH_4^+,although the threshold of neutral pH in the lake is exceeded.This study will enable a better understanding about of the mechanism of release/fixation of phosphorus in acidic sediments in order to assist in making decisions regarding the conservation and management of this natural environment. | Temporetti PEDRO Snodgrass KIMBERLEY Pedrozo FERNANDO | 2013 | International Journal of Sediment Research2013，28，1： | 6 |
| 2 | Current technique oftabularized incised plate hypospadias repair显示文摘 | Warren T Snodgrass Michael T | 2002 | Urology2002，60，1： | 1 |
| 3 | Plasma lipopolysaccharide binding protein and bactericidal/permeability-increaslng factor in GRF and HD patients显示文摘 | Perin BJG Sundaram S Snodgrass B | 1996 | J An Soc Nephrol1996，7，： | 1 |
| 4 | Theory and Experimentation and Retrieval Processes in Short-term Memory Recognition and of Faces显示文摘 | SNODGRASSES J G | 1970 | EXP PSY1970，，35： | 1 |
| 5 | Eco- nomics of Disaster Risk, Social Vulnerability, and Mental Health Resilience显示文摘 | Zahran S Peek L Snodgrass J G Weiler S Hempel L | 2011 | Risk Analysis2011，31，7： | 1 |
| 6 | Current technique of tubulasrized iacised plate hypospadias repair显示文摘 | Snodgrass WT Nguyen MT | 2002 | Urology2002，60，： | 1 |
| 7 | Tubularized incised plate urethroplasty for distal hypospadias显示文摘 | Snodgrass W | 1994 | J Urol1994，151，3： | 1 |
| 8 | Does tabularized incised plate hypospadias repair create neourethral strictures ?显示文摘 | Snodgrass W | 1999 | J Urology1999，162，： | 1 |
| 9 | Efficacy of Fipronil and Provado against tarnished plant bug in cotton显示文摘 | SCOTT W P SNODGRASS G L | 1996 | ESA Arthropod Management Test1996，，： | 1 |
| 10 | thagmatics of Measuring Recognition Memory Application to Dementia and Amnesia显示文摘 | SNODGRASS J G | 1998 | J EXP PAY General1998，，117： | 1 |
| 11 | Cytochrome P450 CYP6X1 cDNAs and mRNA expression levels in three strains of the tarnished plant bug Lygus lineolaris (Heteroptera: Miridae) having different susceptibilities to pyrethroid insecticide 显示文摘 | Zhu YC Snodgrass GL | 2003 | Insect Molecular Biology2003，12，1： | 1 |
| 12 | Experimental cryptosporidiosis in laboratory mice 显示文摘 | Sherwood D Angus KW Snodgrass DR | 1982 | Infect Immun1982，38，2： | 1 |
| 13 | Tubularized, incised plate urethroplasty fordistal hypospadias 显示文摘 | Snodgrass W | 1994 | J Urol1994，151，2： | 1 |
| 14 | tudularized incised plate urethrop lasty for distap hypospadias显示文摘 | Snodgrass W | 1994 | JVrol1994，151，： | 1 |
| 15 | Hypospadias dilemmas:a round table显示文摘 | Snodgrass W Macedo A Hoebeke P | 2011 | J Pediatr Urol2011，7，2： | 1 |
| 16 | Tubularized incised plate urethroplasty for distal hypospadias显示文摘 | Snodgrass W | 1994 | J Urol1994，151，： | 1 |
| 17 | Temporal and real-time databases:a survey显示文摘 | Ozsoyoglu G Snodgrass R | | 0，，04： | 1 |
| 18 | Tubularized incised plate hypospadias repair for proximal hypospadias 显示文摘 | Snodgrass W Koyle M Manzoni G | 1998 | J Urol1998，159，： | 1 |
| 19 | A new algorithm for primary hypospadias repair based on tip nrethroplasty显示文摘 | Sozubir S Snodgrass W | 2003 | J Pediatr Surg2003，38，8： | 1 |
| 20 | Tubularized incised plate hypospadias repair;results of a multicenter experience显示文摘 | Snodgrass W Koyle M Manzoni G | 1996 | J Urol1996，156，2： | 1 |
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