The shift from macrophytic to algal particulate organic matter favours dissimilatory nitrate reduction to ammonium over denitrification in a eutrophic lake
The shift from macrophytic to algal particulate organic matter favours dissimilatory nitrate reduction to ammonium over denitrification in a eutrophic lake
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在富营养化湖泊中，从大型植物到藻类颗粒有机物的转变有利于硝酸盐异化还原为铵，而不是反硝化
DOI：
10.1111/fwb.13863
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发表时间：
2021-12
影响因子：
2.7
通讯作者：
程花
中科院分区：
文献类型：
--
作者：
姜星宇;高光;胡洋;邵克强;汤祥明;程花
在富营养化湖泊中，从水生植物占主导地位的状态转变为藻类占主导地位的状态改变了颗粒有机物（POM）的来源，这反过来又改变了释放和下沉到底栖生物的有机物质量。然而，这种转变对反硝化和异化硝酸盐还原为铵（DNRA）的影响尚不清楚在富营养化lakes. There，我们阐明了各种POM源如何影响这些硝酸盐还原途径在富营养化lakes. How。从八月的湖泊沉积物培养下的藻类，大型植物，在水族箱和土壤处理。潜在的反硝化和DNRA率和相关的功能基因丰度定期测量。结果表明，藻类碎屑比其他POM更不稳定，分解速度更快，DNRA速率和nrfA基因丰度也更高.水生植物处理导致硝酸盐积累和反硝化相关基因丰度的增加，但没有观察到反硝化速率的增加。在土壤处理中，添加POM对硝酸盐还原过程没有显著影响。总体而言，与其他来源相比，藻类来源的POM能够产生高质量的有机碳、较低的溶解氧和硝酸盐浓度，这比藻类化更有利于DNRA;水生植物的减少和藻类生物量的增加将导致原生POM质量的变化，并可能推动富营养化湖泊中氮的循环。
In eutrophic lakes, the shift from a macrophyte‐dominated state to an algae‐dominated state changes the particulate organic matter (POM) sources, which in turn alters organic matter quality that is released and that sinks to the benthos. However, the influences of this shift on denitrification and dissimilatory nitrate reduction to ammonium (DNRA) are unclear in eutrophic lakes.Here, we elucidated how various POM sources influenced these nitrate reduction pathways in a eutrophic lake. The lake sediments from August were incubated under algae, macrophyte, and soil treatments in aquarium tanks. Potential denitrification and DNRA rates and related functional gene abundances were measured periodically. Meanwhile, then‐alkanes composition of POM and fluorescence excitation‐emission matrices of dissolved organic matter were measured before and during incubations, respectively, to aid in the analysis of the potential mechanisms by which organic matter quality affect nitrate reduction.The results indicated that algal detritus was more labile and decomposed faster than other POM, coupled with higher DNRA rates andnrfAgene abundances. Macrophyte treatments resulted in nitrate accumulation and the increase of gene abundances related to denitrification, but no increase in denitrification rates was observed. In soil treatments, nitrate reduction processes were not significantly influenced by the addition of POM. Overall, compared with other sources, algae‐derived POM can produce high‐quality organic carbon, low dissolved oxygen and nitrate concentrations, which is more conducive to DNRA than denitrification.A loss of macrophytes and increase in algal biomass will induce changes in autochthonous POM quality and potentially drive nitrogen recycling in eutrophic lakes.
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影响因子：
2.7
作者：
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通讯作者：
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