ORCID Profile
0000-0001-8583-284X
Current Organisations
Agroscope Standort Changins
,
Fujita Health University
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Publisher: Wiley
Date: 17-12-2019
DOI: 10.1002/ECE3.5926
Publisher: Elsevier BV
Date: 12-2022
Publisher: Wiley
Date: 06-11-2017
DOI: 10.1111/GCB.13928
Abstract: Ecosystems are increasingly prone to climate extremes, such as drought, with long-lasting effects on both plant and soil communities and, subsequently, on carbon (C) cycling. However, recent studies underlined the strong variability in ecosystem's response to droughts, raising the issue of nonlinear responses in plant and soil communities. The conundrum is what causes ecosystems to shift in response to drought. Here, we investigated the response of plant and soil fungi to drought of different intensities using a water table gradient in peatlands-a major C sink ecosystem. Using moving window structural equation models, we show that substantial changes in ecosystem respiration, plant and soil fungal communities occurred when the water level fell below a tipping point of -24 cm. As a corollary, ecosystem respiration was the greatest when graminoids and saprotrophic fungi became prevalent as a response to the extreme drought. Graminoids indirectly influenced fungal functional composition and soil enzyme activities through their direct effect on dissolved organic matter quality, while saprotrophic fungi directly influenced soil enzyme activities. In turn, increasing enzyme activities promoted ecosystem respiration. We show that functional transitions in ecosystem respiration critically depend on the degree of response of graminoids and saprotrophic fungi to drought. Our results represent a major advance in understanding the nonlinear nature of ecosystem properties to drought and pave the way towards a truly mechanistic understanding of the effects of drought on ecosystem processes.
Publisher: Wiley
Date: 26-05-2015
DOI: 10.1111/JVS.12296
Publisher: American Geophysical Union (AGU)
Date: 02-2022
DOI: 10.1029/2021GB007057
Abstract: Peatlands contain a significant fraction of global soil carbon, but how these reservoirs will respond to the changing climate is still relatively unknown. A global picture of the variations in peat organic matter chemistry will aid our ability to gauge peatland soil response to climate. The goal of this research is to test the hypotheses that (a) peat carbohydrate content, an indicator of soil organic matter reactivity, will increase with latitude and decrease with mean annual temperatures, (b) while peat aromatic content, an indicator of recalcitrance, will vary inversely, and (c) elevation will have a similar effect to latitude. We used Fourier Transform Infrared Spectroscopy to examine variations in the organic matter functional groups of 1034 peat s les collected from 10 to 20, 30–40, and 60–70 cm depths at 165 in idual sites across a latitudinal gradient of 79°N–65°S and from elevations of 0–4,773 m. Carbohydrate contents of high latitude peat were significantly greater than peat originating near the equator, while aromatic content showed the opposite trend. For peat from similar latitudes but different elevations, the carbohydrate content was greater and aromatic content was lower at higher elevations. Higher carbohydrate content at higher latitudes indicates a greater potential for mineralization, whereas the chemical composition of low latitude peat is consistent with their apparent relative stability in the face of warmer temperatures. The combination of low carbohydrates and high aromatics at warmer locations near the equator suggests the mineralization of high latitude peat until reaching recalcitrance under a new temperature regime.
Publisher: Public Library of Science (PLoS)
Date: 23-11-2022
DOI: 10.1371/JOURNAL.PONE.0275149
Abstract: Peatlands account for 15 to 30% of the world’s soil carbon (C) stock and are important controls over global nitrogen (N) cycles. However, C and N concentrations are known to vary among peatlands contributing to the uncertainty of global C inventories, but there are few global studies that relate peatland classification to peat chemistry. We analyzed 436 peat cores s led in 24 countries across six continents and measured C, N, and organic matter (OM) content at three depths down to 70 cm. Sites were distinguished between northern (387) and tropical (49) peatlands and assigned to one of six distinct broadly recognized peatland categories that vary primarily along a pH gradient. Peat C and N concentrations, OM content, and C:N ratios differed significantly among peatland categories, but few differences in chemistry with depth were found within each category. Across all peatlands C and N concentrations in the 10–20 cm layer, were 440 ± 85.1 g kg -1 and 13.9 ± 7.4 g kg -1 , with an average C:N ratio of 30.1 ± 20.8. Among peatland categories, median C concentrations were highest in bogs, poor fens and tropical sw s (446–532 g kg -1 ) and lowest in intermediate and extremely rich fens (375–414 g kg -1 ). The C:OM ratio in peat was similar across most peatland categories, except in deeper s les from ombrotrophic tropical peat sw s that were higher than other peatlands categories. Peat N concentrations and C:N ratios varied approximately two-fold among peatland categories and N concentrations tended to be higher (and C:N lower) in intermediate fens compared with other peatland types. This study reports on a unique data set and demonstrates that differences in peat C and OM concentrations among broadly classified peatland categories are predictable, which can aid future studies that use land cover assessments to refine global peatland C and N stocks.
Publisher: Cambridge University Press (CUP)
Date: 30-07-2018
DOI: 10.1017/S0021932018000226
Abstract: Dowry practice, women’s autonomy to use dowry (‘dowry autonomy’) and the association of these with domestic violence were examined among young married women in India. Data were taken from the ‘Youth in India: Situation and Needs Study’ carried out in six Indian states during 2006–07. A total of 13,912 women aged 15–24 years were included in the study. About three-quarters of the women reported receiving a dowry at their marriage, and about 66% reported having the ability to exercise autonomy over the use of it – ‘dowry autonomy’. Dowry given without ‘dowry autonomy’ was found to have had no protective value against young women experiencing physical domestic violence in India. While women’s participation in paid employment increased the odds of them experiencing physical domestic violence, women’s education and marrying after the age of 18 years reduced the likelihood of experiencing physical domestic violence.
No related grants have been discovered for Luca Bragazza.