Space-time dependent variances of ammonia and phosphorus flux on sediment-water interface in Lake Taihu

• Published in: Huanjing kexue Vol. 27; no. 8; p. 1537
• Main Authors: Zhang, Lu, Fan, Cheng-Xin, Wang, Jian-Jun, Zheng, Chao-Hai
• Format: Journal Article
• Language: Chinese
• Published: China 01.08.2006
• Subjects: Ammonia - chemistry; Environmental Monitoring - methods; Environmental Monitoring - statistics & numerical data; Eukaryota - metabolism; Fresh Water - analysis; Fresh Water - chemistry; Geologic Sediments - chemistry; Phosphorus - chemistry; Poaceae - metabolism; Water Pollutants, Chemical - analysis
• ISSN: 0250-3301

Monthly research of ammonia and phosphorus fluxes in water-sediment interface in East Lake Taihu (ELT, macrophyte dominated) and Meiliang Bay (MB, algae dominated) was processed with intact sediment cores' incubation and pore water diffusive model. The ammonia and phosphorus fluxes calculated with intact sediment cores' incubation (F(i)) showed discrepancy in different lake zones with different ecotype. The yearly average fluxes of ammonia and dissolved phosphorus in ELT were (44.9 +/- 21.9) mg x (m2 x d)(-1) (Mean +/- SD) and (2.06 +/- 1.71) mg x (m2 x d)(-1); and (16.2 +/- 12.0) mg x (m2 x d)(-1) and (0.53 +/- 0.52) mg x (m2 x d)(-1) in MB. The molecular diffusive fluxes (F(m)) of the two lake zones showed the same pattern, but the absolute value difference may as high as an order of magnitudes. So this molecular diffusive model cannot be used to evaluate the nutrients fluxes in sediment-water interface in Lake Taihu, a lake vulnerable with wind and wave affection and benthic bio-disturbation. Compared with