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  • speleothem  (2)
  • EARTH SCIENCE 〉 BIOSPHERE 〉 VEGETATION 〉 NITROGEN  (1)
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  • 1
    Publication Date: 2024-03-06
    Description: Abstract
    Description: Intercropping is the simultaneous growth of two or more crops in the same space for a significant part of their life cycle (Willey, 1979). In this context, samples from one farm experiments in the growing season 2015/2016 and 2016/2017, embedded in the cropping systems of one arable farm in the surrounding of Pisa, central-western part of Italy, were collected for analysis. The treatments were: PCW, a temporary intercropping system of wheat and persian clover, sown in paired rows; CONTROLSTRIP, unfertilized wheat as a sole crop, sown in paired rows.
    Description: Methods
    Description: The samples were collected from a farm located in Valtriano, around 20 km from Pisa (43°36’N 10°29’E). The temporary intercropping system comprises common wheat (Triticum aestivum L., cv. Bolero) and persian clover (Trifolium resupinatum L., cv. Laser). Sampling of above-ground plant biomass was done by hands in March 2016 and 2017. For each treatment, above-ground plant biomass was collected several plots which includes three subplots with dimension of 0.25m2 in 2016 and 0.075 m2 in 2017. The samples collected, only for the green part of the plant, were dried at 60°C for 48 h. Then, coarse grinding of the plant fibres (about 1 mm in diameter) was carried out, followed by further cryogenic grinding.
    Keywords: EPOS ; multi-scale laboratories ; geochemistry and microscopy ; geochemistry data ; EARTH SCIENCE 〉 BIOSPHERE 〉 VEGETATION 〉 NITROGEN
    Type: Dataset , Dataset
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  • 2
    Publication Date: 2021-06-16
    Description: High-resolution isotopic analyses were performed on RL4 flowstone from Renella Cave (Alpi Apuane, central Italy), a speleothem studied previously at low resolution. The new data are discussed together with recently obtained data from Corchia and other localities in the central Mediterranean, to elucidate the possible origin and regional articulation of a climatic event centred at ca. 4.0 ka. This analyses indicates that central to southern Italy between ca 3.8 and 4.3 ka was characterized by drier conditions, whereas in Northern Italy the event seems less expressed or, as within the Alps, marked by cooler and wetter conditions. Several lines of evidence suggest that this event could be characterized by longer summer drought and possibly by little impact on precipitation during winter, even if this aspect needs to be explored in more detail. However, the event is particularly prominent in the northern sector of the African Monsoon domain, which has been robustly linked to southward shifts in the ITCZ; whereas its occurrence is uncertain on northern European latitudes. However, many proxies indicate that there aridification probably started some centuries earlier and culminated at ca. 4.0 ka. Taken as a whole, these data can be used to clarify the regional articulation of this event, but interpretations based on general circulation are still elusive.
    Description: Published
    Description: 5-17
    Description: 5A. Paleoclima e ricerche polari
    Description: N/A or not JCR
    Keywords: 4.2 event ; speleothem ; Mediterranean ; Renella Cave
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
    Publication Date: 2019-01-29
    Description: We present new data on the 4.2 ka event in the central Mediterranean from Corchia Cave (Tuscany, central Italy) stalagmite CC27. The stalagmite was analyzed for stable isotopes (delta13C and delta18O) and trace elements (Mg, U, P, Y), with all proxies showing a coherent phase of reduced cave recharge between ca. 4.5 and 4.1 ka BP. Based on the current climatological data on cyclogenesis, the reduction in cave recharge is considered to be associated with the weakening of the cyclone center located in the Gulf of Genoa in response to reduced advection of air masses from the Atlantic during winter. These conditions, which closely resemble a positive North Atlantic Oscillation (NAO) type of configuration, are associated with cooler and wetter summers with reduced sea warming, which reduced the western Mediterranean evaporation during autumn–early winter, further reducing precipitation.
    Description: ARCA project “Arctic: present climatic change and past extreme events” funded by the Italian Ministry of Education Universities and Research (MIUR); Australian Research Council Discovery Project DP160102969; Climate and alluvial event in Versilia: integration of Geoarcheological, Geomorphological, Geochemical data and numerical simulations Fondazione Cassa di Risparmio di Lucca; PRA-2018-41 Georisorse e Ambiente” funded by the University of Pisa
    Description: Published
    Description: 135-151
    Description: 5A. Paleoclima e ricerche polari
    Description: JCR Journal
    Keywords: speleothem ; 4.2 ka BP event ; isotopes ; trace elements ; Paleoclima
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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