湖泊中不同类型溶解性有机物分解对营养循环途径和微生物环结构的调控,Environmental Science & Technology

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湖泊中不同类型溶解性有机物分解对营养循环途径和微生物环结构的调控
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-12-28 , DOI: 10.1021/acs.est.2c06912
Lingling Wan ₁ , Lu Cao _{1,

2} , Chunlei Song ₁ , Xiuyun Cao ₁ , Yiyong Zhou ₁

Affiliation

为了探索不同类型的溶解有机物 (DOM) 分解对养分循环途径和微生物循环的影响，每月调查四个具有不同 DOM 来源的湖泊。在汤逊湖，长豆科植物的腐烂将高度不稳定的溶解有机氮释放到水体中。这会导致细菌有机氮分解，如gltB、gltD、gdh和glnA的丰度增加以及氨肽酶活性所示。与异化硝酸盐还原为铵相关的基因进一步促进了铵的积累，导致夏季微囊藻大量繁殖。在知音湖，鱼饵沉积（高氮，类似于Dolichospermum detritus) 也引起微囊藻大量繁殖。微囊藻的碎屑然后分解产生高水平的不稳定溶解有机磷，诱导磷酸酶活性并增加汤逊湖和知音湖 9 月至 4 月的可溶性活性磷浓度。后官湖水生植物的高耐火DOM导致养分有效性不足，导致藻类和细菌之间的养分互惠。燕东湖陆地碎屑中高含量的不稳定溶解有机碳增加了细菌生物量和产量，由于藻类和细菌营养需求之间的竞争关系导致叶绿素含量低。因此，不同的 DOM 组成会在微生物循环中的可用营养物、藻类和细菌之间产生独特的联系。

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Regulation of the Nutrient Cycle Pathway and the Microbial Loop Structure by Different Types of Dissolved Organic Matter Decomposition in Lakes

To explore the effect of different types of dissolved organic matter (DOM) decomposition on nutrient cycling pathways and the microbial loop, four lakes with different DOM sources were investigated monthly. In Lake Tangxun, Dolichospermum decay released highly labile dissolved organic nitrogen into the water column. This induced bacterial organic nitrogen decomposition, as indicated by the increased abundance of gltB, gltD, gdh, and glnA as well as aminopeptidase activity. Genes associated with dissimilatory nitrate reduction to ammonium further fueled ammonium accumulation, driving Microcystis blooms in the summer. In Lake Zhiyin, fish bait deposits (high nitrogen, similar to Dolichospermum detritus) also caused Microcystis blooms. Detritus from Microcystis decomposition then produced high levels of labile dissolved organic phosphorus, inducing phosphatase activity and increasing soluble reactive phosphorus concentrations from September to April in Lakes Tangxun and Zhiyin. The high refractory DOM from macrophytes in Lake Houguan led to insufficient nutrient availability, leading to nutrient mutualism between algae and bacteria. The high levels of labile dissolved organic carbon from terrestrial detritus in Lake Yandong increased bacterial biomass and production, resulting in low chlorophyll content due to the competitive relationship between algal and bacterial nutrient requirements. Therefore, different DOM compositions induce unique connections among available nutrients, algae, and bacteria in the microbial loop.

更新日期：2022-12-28

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