Seasonal nutrient cycling in integrated rice-shrimp ponds

MARINE POLLUTION BULLETIN

卷:149

Article

Luu Duc Dien^1,2,3  Nguyen Van Sang³  Faggotter, Stephen John^1,2  Chen, Chengrong^1,2  Huang, Jianyin⁴  Teasdale, Peter R.⁴  Sammut, Jesmond⁵  Burford, Michele Astrid^1,2 

[1] Griffith Univ, Australian Rivers Inst, 170 Kessels Rd, Nathan, Qld 4111, Australia

[2] Griffith Univ, Sch Environm & Sci, 170 Kessels Rd, Nathan, Qld 4111, Australia

[3] Res Inst Aquaculture 2, 116 Nguyen Dinh Chieu St,Dist 1, Ho Chi Minh City, Vietnam

[4] Univ South Australia, Sch Nat & Built Environm, Nat & Built Environm Res Ctr, Adelaide, SA 5095, Australia

[5] Univ New South Wales, Ctr Ecosyst Sci, Sch Biol Earth & Environm Sci, Sydney, NSW 2052, Australia

关键词: Carbon;    Chlorophyll a;    Denitrification;    Nutrient fluxes;    Sediment;   

DOI  :  10.1016/j.marpolbul.2019.110647

来源: Elsevier

【 摘 要 】

Integrated rice-shrimp ponds (IRSPs) have periods of low oxygen and high nutrient loads which may have a critical effect on both shrimp survival and water quality in adjacent waterways. To understand drivers of poor water quality, this study examined sediment nutrient pathways at two IRSPs. The study showed that the IRSPs had low denitrification efficiency. However, denitrification rates were significantly positively correlated with chlorophyll a concentrations, suggesting carbon availability was a key driver of denitrification. Dissolved nutrient concentrations in the water column were relatively high despite low sediment nutrient effluxes. Given the low sediment nutrient effluxes, and low nitrogen (N) removal by denitrification, the high nutrient loads were likely derived from incoming water. Therefore, the IRSPs were net nutrient removal mechanisms, rather than contributing to eutrophication in adjacent waterways. There also appears to be scope to enhance denitrification for increased N removal, via carbon addition, and hence improve water quality.

【 授权许可】

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