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首页> 外文期刊>Estuarine Coastal and Shelf Science >Organic carbon and iron modulate nitrification rates in mangrove swamps of Goa, south west coast of India
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Organic carbon and iron modulate nitrification rates in mangrove swamps of Goa, south west coast of India

机译：有机碳和铁调节印度西南海岸果阿红树林沼泽中的硝化速率

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Nitrification, fuelled by ammonium is the pivotal oxidative pathway to nitrogen cycling. In spite of its ecological significance, the factors regulating nitrification rates in the benthic realm remain poorly understood. The present study therefore examines some of the factors like ammonium, nitrite, nitrate, organic carbon, iron and manganese on down-core variability in benthic nitrification rates in two different mangrove ecosystems, one under the influence of ferromanganese ore mining (experiment) and the other relatively undisturbed (control). We hypothesize that besides organic carbon, iron could also influence the rate of nitrification. The study also contrasts the distributive pattern of autotrophic and heterotrophic nitrifiers in the two regions. The concentration of iron at the control site ranged from 1.1% to 15.1% while at the experimental site it ranged from 2.9% to 46%. The levels of organic carbon at control and experimental sites ranged from 0.02% to 6.9% and 0.1% to 6.5%, respectively. The nitrification rates at the control and experimental sites are comparable and ranged from 3.2 ± 1.2 to 18.4 ± 1.9 ng at-Ng(sediment)~(-1) h~(-1) and 2.7 ±1.5 to 18.2 ± 0.6 ng at-N g(sediment)~(-1) h~(-1), respectively. While the abundance of heterotrophic nitrifiers at both the sites ranged from 10~(2-3) cells g~(-1) sediment, the autotrophic nitrifiers at the experimental site was higher by an order at ~10~3 cells g~(-1) sediment reflecting the relatively higher refractile nature of organic carbon at the experimental site (Straus and Lamberti, 2000). Though organic carbon and nitrification rates are similar in both the sites, the underlying mechanisms governing the processes could be different. Our studies suggest that at the control site, heterotrophic nitrifiers govern nitrification rates (r=0.28, p<0.05, n = 64) using organic carbon (r = 0.32, p<0.01, n = 64). At the experimental site, nitrification was governed more by autotrophic nitrifiers (r = 0.43, p < 0.001, n = 64) at the expense of iron (r = 0.47, p < 0.001, n = 64). Therefore at the experimental site with higher load of iron, autotrophic nitrification could be more important. It is therefore inferred that both the quality of organic carbon and quantity of iron govern nitrification rates in these mangrove swamps.
机译：由铵推动的硝化作用是氮循环的关键氧化途径。尽管具有底栖生物的生态意义，但对底栖生物领域中硝化速率的调节因子仍然知之甚少。因此，本研究调查了一些因素，如铵，亚硝酸盐，硝酸盐，有机碳，铁和锰，对两种不同的红树林生态系统底栖硝化速率的下行变异性产生影响，其中一个受到铁锰矿开采（实验）和环境的影响。其他相对不受干扰的（控制）。我们假设除有机碳外，铁还可能影响硝化速率。该研究还对比了这两个地区自养硝化菌和异养硝化菌的分布模式。对照部位的铁浓度为1.1％至15.1％，而实验部位的铁浓度为2.9％至46％。对照和实验点的有机碳含量分别为0.02％至6.9％和0.1％至6.5％。对照和实验点的硝化速率相当，范围在3.2±1.2至18.4±1.9 ng at-Ng（沉积物）〜（-1）h〜（-1）和2.7±1.5至18.2±0.6 ng at-Ng N g（沉积物）〜（-1）h〜（-1）。虽然两个位点的异养硝化菌的丰度范围为10〜（2-3）个细胞g〜（-1）沉积物，但实验位点的自养硝化菌却高出一个数量级，约为〜10〜3个细胞g〜（- 1）沉积物反映了实验点有机碳相对较高的可折射性（Straus和Lamberti，2000）。尽管两个地点的有机碳和硝化速率相似，但控制过程的潜在机制可能不同。我们的研究表明，在控制位点，异养硝化器使用有机碳（r = 0.32，p <0.01，n = 64）控制硝化率（r = 0.28，p <0.05，n = 64）。在实验现场，硝化作用更多地由自养硝化器（r = 0.43，p <0.001，n = 64）来控制，而铁的消耗量（r = 0.47，p <0.001，n = 64）。因此，在铁含量较高的实验现场，自养硝化作用可能更为重要。因此可以推断，在这些红树林沼泽中，有机碳的质量和铁的数量决定着硝化率。

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