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首页> 外文期刊>Estuarine Coastal and Shelf Science >Ambient iron concentration regulates the sulfate reducing activity in the mangrove swamps of Diwar, Goa, India
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Ambient iron concentration regulates the sulfate reducing activity in the mangrove swamps of Diwar, Goa, India

机译：环境铁浓度调节印度果阿迪瓦红树林沼泽中硫酸盐的还原活性

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In order to test the hypothesis that the ambient iron concentrations could regulate sulfate reducing activity (SRA) in mangrove areas, 10 cm cores were examined from test and reference sites. The test site at Diwar mangrove ecosystem is highly influenced by iron released by the movement of barges carrying iron ore during the non-monsoon seasons and the reference site at Tuvem is relatively pristine. The average iron concentrations were 17.9% (±8.06) at Diwar and 6.3% (±1.5) at Tuvem. Sulfate reducing rates (SRR) ranged from 50.21 to 698.66 nM cm~(-3) d~(-1) at Tuvem, and from 23.32 to 294.49 nM cm~(-3)d~(-1) in Diwar. Pearson's correlation coefficients between SRR and environmental parameters showed that at Tuvem, the SRR was controlled by SO_(4~-2) (r = 0.498, p < 0.001, n = 60) more than organic carbon (r = 0.316 p < 0.05, n = 60). At Diwar, the SRR was governed by the iron concentrations at an r-value of -0.761 (p < 0.001, n = 60), suggesting that ca.58% of the variation in SRR was influenced negatively by variations in ambient iron concentrations. This influence was more than the positive influence of TOC (r = 0.615, p < 0.001, n = 60). Laboratory experiments to check the influence of iron on SRR also supported our field observations. At an experimental manipulation of 50 ppm Fe~(3+) there was an increase in SRR but at 100 ppm an inhibitory effect was observed. At 1000 ppm Fe~(3+) there was a decrease in the SRR up to 93% of the control. Thus, our study showed that ambient iron concentrations influence SRR negatively at Diwar and counters the positive influence of organic carbon. Consequently, the influence could cascade to other biogeochemical processes in these mangrove swamps, especially the mineralization of organic matter to carbon dioxide by sulfate respiration.
机译：为了验证环境铁浓度可以调节红树林区域硫酸盐还原活性（SRA）的假设，从测试和参考位置检查了10 cm的岩心。在非季风季节，Diwar红树林生态系统的测试地点受到携带铁矿石的驳船运动释放的铁的影响很大，而Tuvem的参考地点则相对原始。 Diwar的平均铁浓度为17.9％（±8.06），Tuvem的平均铁浓度为6.3％（±1.5）。硫酸盐还原率（SRR）在Tuvem范围为50.21至698.66 nM cm〜（-3）d〜（-1），在Diwar中为23.32至294.49 nM cm〜（-3）d〜（-1）。皮尔逊SRR与环境参数之间的相关系数表明，在图韦姆，SRR受SO_（4〜-2）（r = 0.498，p <0.001，n = 60）的控制大于有机碳（r = 0.316 p <0.05， n = 60）。在Diwar，SRR受铁浓度控制，r值为-0.761（p <0.001，n = 60），这表明大约58％的SRR变化受到环境铁浓度变化的负面影响。这种影响大于TOC的积极影响（r = 0.615，p <0.001，n = 60）。检验铁对SRR影响的实验室实验也支持了我们的现场观察。在50 ppm Fe〜（3+）的实验操作下，SRR有所增加，但在100 ppm时，观察到了抑制作用。在1000 ppm Fe〜（3+）时，SRR降低至对照组的93％。因此，我们的研究表明，环境铁浓度在Diwar处对SRR产生负面影响，并抵消了有机碳的正面影响。因此，这些影响可能会叠加到这些红树林沼泽中的其他生物地球化学过程，特别是通过硫酸盐呼吸作用将有机物矿化为二氧化碳。

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