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  • stable isotopes  (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: 2021-01-05
    Description: The stable isotope composition of living and of Holocene Mytilidae shells was measured in the area of Camarones (Chubut, Argentina). The most striking results were the high 18O values measured in samples older than ca. 6.1 cal ka BP. In the younger samples, the 18O values remained substantially stable and similar to those of living specimens. Analysis of the data revealed the possibility for this isotopic shift to be driven mainly by changes in temperature probably accompanied by minor changes in salinity, suggesting cooler seawater before 6.1 cal ka BP, with a maximum possible temperature shift of ca. 5 C. A possible explanation of this change can be related to a northward position of the confluence zone of the Falkland and Brazilian currents. This is consistent with the data obtained in marine cores, which indicate a northerly position of the confluence in the first half of the Holocene. Our data are also in line with the changes in wind strength and position of the Southern WesterliesWind, as reconstructed in terrestrial proxies from the Southernmost Patagonia region.
    Description: Published
    Description: 3464
    Description: 5A. Ricerche polari e paleoclima
    Description: JCR Journal
    Keywords: Patagonian coast ; mollusk shells ; Holocene ; stable isotopes ; Palaeoceanography of Chubut coast during the Holocene
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
    Publication Date: 2024-01-29
    Description: This article presents data from monthly monitoring carried out on cave and stream waters belonging to the Renella Cave karst system from September 2020 to April 2022. Additionally, old data pertaining to cave waters from previous published work are discussed. The aim is to develop a dataset for future climatic and hydrological studies on the Renella Cave and its surface recharges. Water samples were collected and analyzed for major ions, δ18O and δ2H, on water molecules. The cave sump water level, water temperature, and electrical conductivity were continuously measured and compared to the precipitation data. Additionally, air temperature and pressure inside and outside the cave were also monitored. The classification based on the Piper-Hill diagram indicated that both stream and cave waters belong to the bicarbonate-alkaline earth hydrochemical facies, indicating that their chemism is essentially determined by the dissolution of the Grezzoni Fm. Isotopic data suggest that both stream and cave waters have a meteoric origin, and their variability mainly depends on underground homogenization. Hydrogeochemistry, isotopic composition, and the monitoring data allowed a deeper understanding of the cave karst system, and identified an underground circulation network that is fragmented into independent parts.
    Description: Published
    Description: 1764
    Description: OSA2: Evoluzione climatica: effetti e loro mitigazione
    Description: JCR Journal
    Keywords: hydrological monitoring; ; stable isotopes ; karst system; ; Apuan Alps; ; hydrogeochemistry;
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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