Assessing the role of deltaic flood plain wetlands on regulating methane and carbon balance

Author(s):  
Sandipta Debanshi ◽  
Swades Pal
Keyword(s):  
2019 ◽  
Vol 661 ◽  
pp. 531-542 ◽  
Author(s):  
E.F. Viglizzo ◽  
M.F. Ricard ◽  
M.A. Taboada ◽  
G. Vázquez-Amábile

2019 ◽  
Vol 3 (3) ◽  
pp. 436-471
Author(s):  
Elisabeth R. O'Connell

This contribution examines how models of exile were adopted and adapted in non-Chalcedonian communities following the establishment of a parallel Severan episcopal hierarchy under Archbishop Peter IV of Alexandria (576–577) and the consolidation of the Severan non-Chalcedonian church under his successor Damian (578–c. 607). Peter's predecessor Theodosius spent most of his long episcopacy (536–566) exiled in Constantinople, where he died, and Peter himself contended with three rivals to the patriarchate of Alexandria. Drawing on literary, documentary, and archaeological sources, I explore how the memory of non-Chalcedonian heroes was mobilized partly in order to validate the uncomfortable truth that members of the new network of bishops did not always live in their capitals, but in local monasteries, just as Peter and Damian did not live in Alexandria, but in the Enaton, nine miles to the west. After a brief survey of the role of exile in the Alexandrian Church, I concentrate on the literary representation of the appropriate places for exile in monastic literature, in particular the identification of the “deserts” and “mountains,” “caves” and “holes” of the wandering Hebrews (Heb 11.38) with the monastic landscape of Egypt in the late sixth and early seventh centuries. At this time, monastic habitation of natural caves, gallery quarries, and rock-cut tombs on the desert escarpment above the Nile Valley flood plain flourished. Finally, I survey the archaeological evidence of one region where bishops appointed by Damian settled, and how they put their models of exile into practice.


2016 ◽  
Vol 20 (1) ◽  
pp. 108-122 ◽  
Author(s):  
Zhanhuan Shang ◽  
Andrew White ◽  
A. Allan Degen ◽  
Ruijun Long

2020 ◽  
Vol 28 (2) ◽  
pp. 412-416
Author(s):  
Zdeněk Dolníček

There is described a new occurrence of mud limonite iron ore in this paper. Limonite originates recently in streams situated in flood plain of the Morava River near Hulín (central Moravia, Czech Republic). The chemical composition of precipitated limonite indicates that a contamination of subterranean waters by phosphorus, arsenic and some transitional metals (Cr, Zn) occurs here, very probably due to long-lasting intense agricultural usage of the surrounding fields. Based on experimental precipitation of limonite from local well water, a probable mechanism of formation of limonite was outlined. The Fe2+ ions, dissolved in the subterranean waters, are after their seepage into the stream oxidized by aerial oxygen to Fe3+, which is subsequently hydrolysed and precipitated in form of solid iron hydroxide. An important role of microorganisms and/or organic matter during precipitation of limonite is not suggested by collected data.


2020 ◽  
Author(s):  
Marcos Fernández-Martínez ◽  
Jordi Sardans ◽  
Josep Peñuelas ◽  
Ivan Janssens

<p>Global change is affecting the capacity of terrestrial ecosystems to sequester carbon. While the effect of climate on ecosystem carbon balance has largely been explored, the role of other potentially important factors that may shift with global change, such as biodiversity and the concentration of nutrients remains elusive. More diverse ecosystems have been shown to be more productive and stable over time and differences in foliar concentrations of N and P are related to large differences in how primary producers function. Here, we used 89 eddy-covariance sites included in the FLUXNET 2015 database, from which we compiled information on climate, species abundance and elemental composition of the main species. With these data, we assessed the relative importance of climate, endogenous factors, biodiversity and community-weighted concentrations of foliar N and P on terrestrial carbon balance. Climate and endogenous factors, such as stand age, are the main determinants of terrestrial C balance and their interannual variability in all types of ecosystems. Elemental stoichiometry, though, played a significant role affecting photosynthesis, an effect that propagates through ecosystem respiration and carbon sequestration. Biodiversity, instead, had a very limited effect on terrestrial carbon balance. We found increased respiration rates and more stable gross primary production with increasing diversity. Our results are the first attempt to investigate the role of biodiversity and the elemental composition of terrestrial ecosystems in ecosystem carbon balance.</p>


2021 ◽  
Vol 18 (1) ◽  
pp. 207-228
Author(s):  
Oleg Sizov ◽  
Ekaterina Ezhova ◽  
Petr Tsymbarovich ◽  
Andrey Soromotin ◽  
Nikolay Prihod'ko ◽  
...  

Abstract. The rapidly warming Arctic undergoes transitions that can influence global carbon balance. One of the key processes is the shift towards vegetation types with higher biomass underlining a stronger carbon sink. The shift is predicted by bioclimatic models based on abiotic climatic factors, but it is not always confirmed with observations. Recent studies highlight the role of disturbances in the shift. Here we use high-resolution remote sensing to study the process of transition from tundra to forest and its connection to wildfires in the 20 000 km2 area in northwest Siberia. Overall, 40 % of the study area was burned during a 60-year period. Three-quarters of the burned areas were dry tundra. About 10 % of the study area experienced two–three fires with an interval of 15–60 years suggesting a shorter fire return interval than that reported earlier for the northern areas of central Siberia (130–350 years). Based on our results, the shift in vegetation (within the 60-year period) occurred in 40 %–85 % of the burned territories. All fire-affected territories were flat; therefore no effect of topography was detected. Oppositely, in the undisturbed areas, a transition of vegetation was observed only in 6 %–15 % of the territories, characterized by steeper topographic slopes. Our results suggest a strong role of disturbances in the tree advance in northwest Siberia.


2020 ◽  
Vol 26 (12) ◽  
pp. 7067-7078
Author(s):  
Marcos Fernández‐Martínez ◽  
Jordi Sardans ◽  
Talie Musavi ◽  
Mirco Migliavacca ◽  
Maitane Iturrate‐Garcia ◽  
...  

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