搜索结果: 1-14 共查到“理学 isotope composition”相关记录14条 . 查询时间(0.058 秒)
Do grazer hair and faeces reflect the carbon isotope composition of semi-arid C3/C4 grassland?
Community composition Grazing pressure Ecosystem reconstruction Pasture Trophic shift Digestibility Selectivity Discrimination Diet Inner Mongolia
2015/2/4
The carbon isotope composition ( d13C) of C3/C4 mixed grassland is reflected in the d13C of diet, hair or faeces of grazers, if 13C discrimination (13 D) between grassland vegetation and these tissues...
Lithium abundance and isotope composition of Logudoro basalts, Sardinia: Origin of light Li signature
lithium isotopes diffusion mantle heterogeneity Sardinia
2017/4/12
Basalts from Logudoro, Sardinia (Italy), showing geochemical features similar to EM1-type mantle source, have been
analyzed for their Li isotopic composition to provide data related to a heretofore u...
Sr–Nd isotope composition of the Bay of Bengal sediments: Impact of climate on erosion in the Himalaya
Himalaya Bay of Bengal erosion climate Sr–Nd isotopes
2017/4/12
A temporal high-resolution analysis of Sr–Nd isotopic composition, Fe, Al and V concentration and magnetic susceptibility
(MS) has been carried out in a sediment core from the western Bay of Bengal t...
Isotope composition of bulk carbon in replicated Sphagnum peat cores from three Central European high-elevation wetlands
peat Sphagnum carbon C sequestration isotopes
2017/8/9
Several processes may contribute to systematic downcore trends in δ13C of bulk Sphagnum peat. Whereas changes in water availability during C assimilation may change δ13C values in both a negative and ...
Possible precursor of perylene in sediments of Lake Biwa elucidated by stable carbon isotope composition
Lake Biwa perylene stable carbon isotopic composition sediment
2017/8/9
We determined the stable carbon isotope compositions (δ13C values) of perylene and compounds coexisting with it to elucidate the precursor of perylene in sediments of Lake Biwa. Although we found a hi...
Groundwaters of Mt. Vulture volcano, southern Italy: Chemistry and sulfur isotope composition of dissolved sulfate
Mt. Vulture volcano water-rock interaction silicate weathering hydrogeochemistry sulfur isotope composition
2017/8/9
We report the chemical composition of groundwaters—including the first data on the sulfur isotopic composition of dissolved sulfate—from the volcanic aquifers of Mt. Vulture, one of the most important...
Carbon isotope composition of fatty acids and sterols in the scleractinian coral Turbinaria reniformis: Effect of light and feeding
Carbon isotope composition fatty acids sterols the scleractinian coral Turbinaria reniformis: Effect of light and feeding
2014/4/17
The effect of auto- and heterotrophy on the carbon isotope composition (d13C) of fatty acids (FA) and sterols was studied in the scleractinian coralTurbinaria reniformis. Colonies were maintained in a...
Large regional-scale variation in C3/C4 distribution pattern of Inner Mongolia steppe is revealed by grazer wool carbon isotope composition
regional-scale variation C3/C4 distribution pattern Inner Mongolia steppe isotope composition
2010/1/20
This work explored the spatial variation of C3/C4 distribution in the Inner Mongolia, P. R. China, steppe by geostatistical analysis of carbon isotope data of vegetation and sheep wool. Standing commu...
Zinc isotope composition of settling particles as a proxy for biogeochemical processes in lakes: Insights from the eutrophic Lake Greifen, Switzerland
Zinc isotope composition a proxy for biogeochemical processes
2014/4/17
The isotope composition of zinc (Zn) was determined in settling particles collected monthly over a year in the
hypolimnion of the eutrophic Lake Greifen (Switzerland) in order to explore the potentia...
The O and H stable isotope composition of freshwaters in the British Isles. 2. Surface waters and groundwater
Stable isotopes surfacewaters groundwater British Isles
2009/3/12
The utility of stable isotopes as tracers of the water molecule has a long pedigree. The study reported here is part of an attempt to establish a comprehensive isotopic "baseline" for the British Isle...
The O and H stable isotope composition of freshwaters in the British Isles. 1. Rainfall
stable isotopes rainfall British Isles
2009/3/12
An understanding of the hydrological cycle in stable isotopic terms requires the characterisation of rainfall.
Deposition of nitrogen and phosphorus on the Baltic Sea:seasonal patterns and nitrogen isotope composition
nitrogen phosphorus Baltic Sea seasonal patterns nitrogen isotope composition
2010/1/18
Atmospheric deposition of nitrogen and phosphorus on the central Baltic Sea (Baltic Proper) was estimated monthly at two coastal stations and two isolated islands in 2001 and 2002. Yearly nitrogen dep...
Stable carbon and nitrogen isotope composition of aquatic and terrestrial plants of the San Francisco Bay estuarine system
Stable carbon nitrogen isotope composition aquatic and terrestrial plants San Francisco Bay estuarine system
2014/5/27
We report measurements of seasonal variability in the C-N stable isotope ratios of plants collected across the habitat mosaic of San Francisco Bay, its marshes, and its tributary river system. Analyse...
Experimental Alteration of Volcanic Tuff: Smectite Formation and Effect on 18O Isotope Composition
Alteration Mechanism of Volcanic Tuff Oxygen Isotope Exchange Smectite Tuff
2011/12/8
Abstract: Three samples of volcanic tuff were hydrothermally altered at ∼82°C in a soxhlet apparatus for periods from 745 to 2706 h. The samples correspond to partially altered specimens of volc...