Spatio-temporal variation in the characteristics of dissolved organic matter in the streams of boreal forests: Impacts on modelled copper speciation

Forest fires can change the quality of dissolved organic matter (DOM) in soils, and consequently have a great influence on biogeochemical cycles in forest ecosystems. However, little information is available regarding the effects of fire on the chemical composition of DOM in boreal forest soils. To clarify these effects, the molecular composition of soil DOM was compared between recently-burned and long-unburned boreal forests (6 and 156 years since the last fire, respectively) in Finnish Lapland. Ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry revealed that there were no significant differences in species, average molecular weight or the number of molecular compounds detected between the recently-burned and long-unburned forests. However, the number of compounds with condensed aromatic structures tended to be larger in the recently-burned forest, whereas the numbers of proteins and carbohydrates not shared between the two forests were significantly smaller. Lignin-like molecules accounted for most of the total molecular species in both forests. Our results suggest that fire not only generated several species of dissolved black carbon, but also caused burned plant residues, which supplied diverse lignin-like molecules in the recently-burned forest soils and led to the number of molecular species being comparable to that in the long-unburned forest soils.

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Comparison of tree species effects on microbial C and N transformations and dissolved organic matter properties in the organic layer of boreal forests

Applied Soil Ecology ◽

10.1016/j.apsoil.2011.05.002 ◽

2011 ◽

Vol 49 ◽

pp. 224-233 ◽

Cited By ~ 28

Author(s):

A. Smolander ◽

V. Kitunen

Keyword(s):

Organic Matter ◽

Dissolved Organic Matter ◽

Tree Species ◽

Boreal Forests ◽

Organic Layer ◽

N Transformations ◽

Species Effects ◽

Tree Species Effects ◽

C And N ◽

Microbial C

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Spatio-temporal variations of fluorescence properties of dissolved organic matter along the River Têt (Pyrénées-Orientales, France)

Chemistry and Ecology ◽

10.1080/02757540903325104 ◽

2009 ◽

Vol 25 (6) ◽

pp. 435-452 ◽

Cited By ~ 5

Author(s):

Florence Vouvé ◽

Leticia Cotrim da Cunha ◽

Léon Serve ◽

Jean Vigo ◽

Jean-Marie Salmon

Keyword(s):

Organic Matter ◽

Dissolved Organic Matter ◽

Temporal Variations ◽

Fluorescence Properties ◽

Spatio Temporal

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Spatio‐temporal changes in dissolved organic matter composition along the salinity gradient of a marsh‐influenced estuarine complex

Limnology and Oceanography ◽

10.1002/lno.11857 ◽

2021 ◽

Author(s):

Maria L. Letourneau ◽

Sylvia C. Schaefer ◽

Huan Chen ◽

Amy M. McKenna ◽

Merryl Alber ◽

...

Keyword(s):

Organic Matter ◽

Dissolved Organic Matter ◽

Salinity Gradient ◽

Temporal Changes ◽

Organic Matter Composition ◽

Spatio Temporal

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Synchronism of Production and Degradation of Litter in Fragment of Dry Tropical Forest in Paraiba, Brazil

Journal of Agricultural Science ◽

10.5539/jas.v11n6p308 ◽

2019 ◽

Vol 11 (6) ◽

pp. 308

Author(s):

Yasmim Yathiara Gomes Araújo Morais ◽

Patrícia Carneiro Souto ◽

Sérvio Túlio Pereira Justino ◽

Valdirene Henrique Nunes ◽

Anderlon Arrais de Moraes Monte ◽

...

Keyword(s):

Organic Matter ◽

Temporal Variation ◽

Rainy Season ◽

Forest Floor ◽

Caatinga Vegetation ◽

Average Production ◽

Litter Deposition ◽

Metal Frame ◽

Spatio Temporal ◽

The One

The litter is an important way of returning the organic matter to the soil, through the cycling of the nutrients, aiding in the development of the vegetation present in the ecosystems. The study aimed to estimate the spatio-temporal variation of deposition, accumulation and decomposition of the litter present in the preserved caatinga vegetation, located in the RPPN Fazenda Tamanduá in Santa Terezinha-PB, Brazil and the interference of climatic variables in the dynamics of these events. The research was conducted at RPPN Fazenda Tamanduá, in Santa Terezinha-PB, Brazil. The deposition of litter on 20 collectors of 1.0 m × 1.0 m was collected monthly in two periods: period I (August/2015 to July/2016) and period II (August/2016 to July/2017), the collected material was separated into leaves, branches + barks, reproductive and miscellaneous fractions. To estimate the rate of decomposition the litter accumulated on the forest floor was quantified using a 0.5 m × 0.5 m metal frame. The deposition of the total litter in periods I and II was 2,356.83 kg ha-1 and 1,163.67 kg ha-1, respectively. The leaf fraction was the one that contributed the most during the two collection periods. The analysis of the data allowed to conclude that the total litter deposition in the two periods is in line with the average production for the Caatinga. The increase in precipitation provided higher deposition of litter after the rainy season. Due to several factors, the decomposition of litter in the caatinga is slower than in other biomes.

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