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  • stable isotopes  (2)
  • Achnanthes sp.; AGE; alkanes; Amphora copulata; Amphora ovalis; Amphora pediculus; Amphora subconstricta; Asterionella formosa; Aulacoseira sp.; Biodiversity; Cavinula cocconeiformis; Chironomidae; Cocconeis neodiminuta; Cocconeis placentula; Cocconeis sp.; Counting valves; Cymbella parva; Cymbella sp.; Denticula kuetzingii; Denticula sp.; Denticula tenuis; DEPTH, sediment/rock; deuterium; Diatoma sp.; diatoms; Diatoms, centrales indeterminata; Diploneis sp.; Discotella stelligera; ecosystem dynamics; Encyonema minutum; Encyonema silesiacum; Epithemia adnata; Epithemia gibba; Epithemia sorex; Epithemia sp.; Epithemia turgida; Eunotia curvata; Eunotia flexuosa; Eunotia rhomboidea; Eunotia sp.; Fallacia pygmaea; Fragilaria recapitellata; Fragilaria sp.; Fragilariforma constricta; Fragilariforma lata; GDGTs; Germany; Gogorevia exilis; Gomphonema brebissonii; Gomphonema clevei; Gomphonema parvulum; Gomphonema sp.; Haemelsee; Haemelsee_Haem13; Halamphora thumensis; Khursevichia jentzschii; Lake Haemelsee, Germany; Lindavia bodanica; LOI; Meridion circulare; Navicula cincta; Navicula exilis; Navicula lanceolata; Navicula radiosa; Navicula sp.; Nepula vitiosa; Niederreiter Piston corer; Nitzschia dissipata; Nitzschia gracilis; Nitzschia lacuum; Nitzschia obtusa var. brevissima; Nitzschia sp.; NPC; Nupela tenuicephala; ORDINAL NUMBER; Pantocsekiella delicatula; Pantocsekiella ocellata; Pediastrum; Placoneis elginensis; Placoneis gastrum; Planothidium joursacense; Platessa conspicua; Pleurosigma sp.; Psammothidium helveticum; Pseudostaurosira brevistriata; Pseudostaurosira robusta; Pseudostaurosira spp.; Sellaphora pupula; Stauroforma exiguiformis; Stauroneis anceps; Stauroneis construens; Stauroneis sp.; Staurosira construens; Staurosirella pinnata; Staurosirella pinnata var. acuminata; Staurosirella pinnata var. intercedens; Staurosirella pinnata var. minutissima; Tabellaria fenestrata; Tabellaria flocculosa; Tabellaria quadriseptata; Tabellaria sp.; XRF  (1)
  • EARTH SCIENCE 〉 BIOSPHERE 〉 VEGETATION 〉 NITROGEN  (1)
Collection
Keywords
Publisher
Years
  • 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
    Location Call Number Expected Availability
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  • 2
    Publication Date: 2024-06-12
    Description: This dataset provides counts of diatom valves for the Lateglacial sediment sequence retrieved from Lake Hämelsee (Germany) in 2013. Counts per taxon are presented against both depth (m) and age (cal yr. BP). The diatom data provides information on Lateglacial ecosystem dynamics and the dataset was used to interpret changes in aquatic diversity as well as in palaeolimnological conditions. A total of 78 samples were selected for diatom analysis using 2-5 cm sample intervals throughout the Lateglacial section of the core sequence, with a higher sampling resolution (1 cm intervals) around key transitions. Organic matter was removed from the samples (ca. 0.01 grams dried sediment) by oxidation using 5 ml of H2O2 (30%) and heating in a water bath at 70 °C for 24-28 hrs. Subsequently, a few drops of HCl (50%) were added to remove residual H2O2 and carbonates. Samples were washed by adding distilled water, shaking vigorously, centrifuging at 1200 rpm for 4 minutes, and removing the liquid using a pipette. This process was repeated 5 times, and a few drops of ammonia (NH3) were added to the solution prior to the final wash to prevent clumping of diatoms. Diatom slides were mounted using Naphrax and diatoms were identified using Krammer and Lange-Bertalot (1986–1991) and Camburn and Charles (2000). For several samples the target count sum of 300 diatom valves could not be reached due to low concentrations or poor diatom preservation. Prior to analysis and interpretation, and where possible, neighbouring samples with a low count sum were amalgamated until a count of at least 100 valves was reached; if this was not possible the samples were deleted from our dataset prior to subsequent analysis (note that these samples are still included in the dataset provided here). All analyses were performed in the laboratories of University College London, UK.
    Keywords: Achnanthes sp.; AGE; alkanes; Amphora copulata; Amphora ovalis; Amphora pediculus; Amphora subconstricta; Asterionella formosa; Aulacoseira sp.; Biodiversity; Cavinula cocconeiformis; Chironomidae; Cocconeis neodiminuta; Cocconeis placentula; Cocconeis sp.; Counting valves; Cymbella parva; Cymbella sp.; Denticula kuetzingii; Denticula sp.; Denticula tenuis; DEPTH, sediment/rock; deuterium; Diatoma sp.; diatoms; Diatoms, centrales indeterminata; Diploneis sp.; Discotella stelligera; ecosystem dynamics; Encyonema minutum; Encyonema silesiacum; Epithemia adnata; Epithemia gibba; Epithemia sorex; Epithemia sp.; Epithemia turgida; Eunotia curvata; Eunotia flexuosa; Eunotia rhomboidea; Eunotia sp.; Fallacia pygmaea; Fragilaria recapitellata; Fragilaria sp.; Fragilariforma constricta; Fragilariforma lata; GDGTs; Germany; Gogorevia exilis; Gomphonema brebissonii; Gomphonema clevei; Gomphonema parvulum; Gomphonema sp.; Haemelsee; Haemelsee_Haem13; Halamphora thumensis; Khursevichia jentzschii; Lake Haemelsee, Germany; Lindavia bodanica; LOI; Meridion circulare; Navicula cincta; Navicula exilis; Navicula lanceolata; Navicula radiosa; Navicula sp.; Nepula vitiosa; Niederreiter Piston corer; Nitzschia dissipata; Nitzschia gracilis; Nitzschia lacuum; Nitzschia obtusa var. brevissima; Nitzschia sp.; NPC; Nupela tenuicephala; ORDINAL NUMBER; Pantocsekiella delicatula; Pantocsekiella ocellata; Pediastrum; Placoneis elginensis; Placoneis gastrum; Planothidium joursacense; Platessa conspicua; Pleurosigma sp.; Psammothidium helveticum; Pseudostaurosira brevistriata; Pseudostaurosira robusta; Pseudostaurosira spp.; Sellaphora pupula; Stauroforma exiguiformis; Stauroneis anceps; Stauroneis construens; Stauroneis sp.; Staurosira construens; Staurosirella pinnata; Staurosirella pinnata var. acuminata; Staurosirella pinnata var. intercedens; Staurosirella pinnata var. minutissima; Tabellaria fenestrata; Tabellaria flocculosa; Tabellaria quadriseptata; Tabellaria sp.; XRF
    Type: Dataset
    Format: text/tab-separated-values, 6862 data points
    Location Call Number Expected Availability
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  • 3
    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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  • 4
    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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