شناسه هاي افزوده :
نگارستان، حسين ، همكارطرح , نجف پور، شعبان ، همكارطرح , افرايي، محمد علي ، همكارطرح , روحي، ابوالقاسم ، همكارطرح , واحدي، فريبا ، همكارطرح , نصراله تبار، عبداله ، همكارطرح , علومي، يوسف ، همكارطرح , يونسي پور، حوريه ، همكارطرح , مخلوق، آسيه ، همكارطرح , خداپرست، نوربخش ، همكارطرح , يعقوب زاده، زهرا ، همكارطرح , رامين، محمود ، همكارطرح
چكيده انگليسي :
Abstract
This study was conducted to spatio-temporal fluctuation and distribution of phosphorous and nitrogen species, total organic carbone and some environmental parameters at suface sediments in the southern of Caspian Sea. In current study, 48 samples were collected from four stations (Bandar Anzali, Tonekabon, Bandar Nowshahr and Bandar Amirabad) and three dephths (5, 10 and 20 meter) during four seasons in 2013-2014. Results of this study showed that annual mean of Adsorbed-P, Fe-P, Al-P, Bioava.-P, Ca-P, TIP, Rese.-P and TP were obtained 6.68±0.63, 60.90±2.44, 24.94±2.39, 94.52±3.62, 1868±36, 1963±37, 87.51±9.52 and 2050±38 µg/g.dw, respectively. Result also showed that inorganic phophotous was maximum during different seasons, however, percent mean of residue-P which containe organic compounds and non-degrediable compounds, was less that 5 percent. Percent of Ca-P was higher than 90, whereas Bioava.-P was less that 10 percent. The order of different forms of phosphorous were registered Ca-P>Org-P>Fe-P>Al-P>Adsorbed-P.Annual mean of NH4/N, NO3/N, TIN, TON and TN were observed 2.56±0.27, 0.89±0.12, 3.52±0.26, 6.06±0.27 and 9.57±0.32µg/g.dw respectively. Annual percent of TON was two folds than TIN and NH4/N was also three times than NO3/N. In addition, mean of Fe, Al, Ca, Eh and TOC% were obtained 25.39±0.65, 18.76±0.68, 60.15±1.50 mg/g.dw and -67.02±0.68, 1.11±0.09, respectively. Maximum mean of carbon (1152±171), nitrogen (0.87±0.05) and phoporous (74±23) µM/g were observed in fall, winter and summer, recpectively. Also, maximum ratios of TOC:TP (16.8±2.3) and TOC:TN (2378±363) were obtained in fall season.
As a conclusion, mian role of Adsorbed-P, Fe-P and Al-P adsorbed and desorbed were temperature, Eh and pH, respectively. Results of this study showed that TOC:TN was very high which represented to excitance of organic matter with almost non-degrediable. Whereas, TOC:TP was low which showed that organic phophoros was not related to proteins and phospholipids therefore sources of org-P were belong to other compounds.
كليدواژه :
فسفر , ايران , فسفر , ازت , كربن , پارامترهاي محيطي , رسوبات سطحي , درياي خزر
