Lake Chemodiversity Driven by Natural and Anthropogenic Factors

Glacier-retreated areas are ideal areas to study soil biogeochemical processes during vegetation succession, because of the limited effect of other environmental and climatic factors. In this study, the changes of soil dissolved organic matter (DOM) and its relationship with microbial communities along the Hailuogou Glacier forefield chronosequence were investigated. Both microbial diversity and DOM molecular chemodiversity recovered rapidly at the initial stage, indicating the pioneering role of microorganisms in soil formation and development. The chemical stability of soil organic matter enhanced with vegetation succession due to the retaining of compounds with high oxidation state and aromaticity. The molecular composition of DOM affected microbial communities, while microorganisms tended to utilize labile components to form refractory components. This complex relationship network between microorganisms and DOM components played an important role in the development of soil organic matter as well as the formation of stable soil carbon pool in glacier-retreated areas.

Section: Introductionmentioning

confidence: 99%

Changes of Soil Dissolved Organic Matter and Its Relationship with Microbial Community along the Hailuogou Glacier Forefield Chronosequence

Jiang

et al. 2023

“…Dissolved organic matter (DOM) plays an important role in the carbon biogeochemical cycle of aquatic ecosystems, including modulating the emission of CO 2 and CH 4 and supplying for microbial lives. , A handful of water contains thousands of DOM molecules, and with the rapid development of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), these DOM molecules have a great chemodiversity, although the isomeric diversity behind each elemental composition is obscure as yet. − The resulting diversity could be from two processes. One is the generation process of DOM, which mainly includes the microbial degradation of terrestrial and endogenous non-living particulate organic matter (POM), the exudation of metabolites of living aquatic organisms, the lysis of microbial cells caused by virus infection, and photochemical degradation of the high-molecular-weight DOM; − the other is the DOM consumption process, mainly including the microbial utilization, secondary decomposition, and mineralization and photodegradation of labile DOM. , The microbial metabolites are species-specific, and the variation in microbial community composition can thus affect the DOM chemodiversity.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, the understanding of DOM chemodiversity and its regulatory mechanism in inland waters is still in the infancy. ,, The environmental factors such as hydrology and nutrient availability that may affect DOM production and consumption could modulate DOM chemodiversity. ,− Furthermore, the DOM concentration in the pore waters of sediments is much higher than that in the overlying waters due to more degradation of POM, and then the DOM releases, resulting in the more DOM complexity in the upper waters . Surprisingly, it is found that DOM chemical composition has an obvious geographical distribution difference either in water or in sediment, ,, of which the relevant control mechanism remains to be clarified.…”

Section: Introductionmentioning

confidence: 99%

Chemodiversity of Dissolved Organic Matter Is Governed by Microbial Biogeography in Inland Waters

Liu

et al. 2023

Dissolved organic matter (DOM) is crucial for the carbon biogeochemical cycle and has a close link with microbiome in aquatic ecosystems; however, the causal relationship between DOM and microbial diversity in inland waters is not very clear so far. Therefore, a national survey of China's inland waters was conducted, and the DOM chemical composition and microbial community composition were determined by Fourier transform ion cyclotron resonance mass spectrometry and high-throughput sequencing to clarify the abovementioned question. Here, we found that DOM chemodiversity was governed by microbial community assembly in inland waters, not vice versa. Under the control of microbial biogeography, DOM chemodiversity showed a clear geographical distribution difference. Water DOM chemodiversity was mainly constrained by bacterial and archaeal community composition, whereas sediment DOM chemodiversity was mainly controlled by eukaryotic and fungal community composition. In addition, the sediment DOM chemical composition was also affected by the interaction of different microbial groups between waters and sediments. The study is the first to clarify the causal relationship and proposes a microbial regulatory mechanism on the geographical distribution pattern of DOM chemodiversity, thus further deepening the understanding of the DOM biogeochemical cycle.

“…Soil dissolved organic matter (DOM) consists of a mass of complex organic compounds in soil solutions, which plays an important role in a range of (bio)geochemical processes, including the cycling of carbon and nutrients − and the distribution of metals. , The chemical complexity of DOM is usually characterized by its heterogeneity of molecular compositions and chemodiversity of DOM samples from various origins or sources, − which can be reflected by the varying chemical compositions and molecular properties of DOM under different environmental conditions. − The complex compositions and properties of DOM in soils and lakes across widely environmental gradients have been revealed at the molecular level, − which may be controlled by its intrinsic molecular properties in lakes and by both climate and soil properties in soils . However, few studies focused on the links between the chemical complexity of DOM and their functions.…”

Section: Introductionmentioning

confidence: 99%

Unified Modeling Approach for Quantifying the Proton and Metal Binding Ability of Soil Dissolved Organic Matter

Ding

et al. 2022

Soil dissolved organic matter (DOM) is composed of a mass of complex organic compounds in soil solutions and significantly affects a range of (bio)geochemical processes in soil environment. However, how the chemical complexity (i.e., heterogeneity and chemodiversity) of soil DOM molecules affects their proton and metal binding ability remains unclear, which limits our ability for predicting the environmental behavior of DOM and metals. In this study, we developed a unified modeling approach for quantifying the proton and metal binding ability of soil DOM based on Cu titration experiments, Fourier transform ion cyclotron resonance mass spectrometry data, and molecular modeling method. Although soil DOM samples from different regions have enormously heterogeneous and diverse properties, we found that the molecules of soil DOM can be divided into three representative groups according to their Cu binding capacity. Based on the molecular models for individual molecular groups and the relative contributions of each group in each soil DOM, we were able to further develop molecular models for all soil DOM to predict their molecular properties and proton and metal binding ability. Our results will help to develop mechanistic models for predicting the reactivity of soil DOM from various sources.