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1)  Carbon isotope composition(δ13C)
碳同位素组成(δ13C)
1.
The physiological changes in leaf net photosynthetic rate(Pn),transpiration rate(Tr),intercellular CO2 concentration(Ci),stomatal density,and carbon isotope composition(δ13C) of three alfalfa varieties were measured at three soil water levels in a greenhouse pot experiment.
采用盆栽试验,测定了3种紫花苜蓿品种的光合(Pn)、蒸腾(Tr)、胞间CO2浓度(Ci)、气孔密度和叶片碳同位素组成(δ13C)等,探讨不同紫花苜蓿品种在水分胁迫下的水分利用效率(WUE)的变化。
2)  stable carbon isotope composition(δ13C)
碳稳定同位素组成(δ13C)
3)  δ13C isotope
δ13C同位素
4)  δ13C values
稳定碳同位素(δ13C值)
5)  stable carbon isotope discrimination(Δ 13C)
稳定碳同位素分辨率(Δ13C)
6)  Carbon isotope composition
碳同位素组成
1.
The reverse series of carbon isotope composition of natural gas in this area is mainly caused by the same-type and different-source gas or the same source and different-phase gas in humic-type organic ma.
本区天然气的碳同位素组成具有倒转序列特征,这主要是由腐殖型母质的“同型不同源”气或“同源不同期”气的混合造成的,同时也不排除由天然气中某一或某些组分被细菌氧化所造成。
2.
The molecular compositions and compound-specific stable carbon isotope compositions of individual n-alkanes from surface sediments of the East China Sea(ECS) mud areas including the coastal mud area,the southwest mud area to Cheju Island,and the Northern Okinawa Trough were analyzed using gas chromatography/mass spectrometry(GC/MS) and gas chromatography/isotopic ratio mass spectrometry (GC/IRMS).
利用气相色谱(GC)和气相色谱/同位素比值质谱(GC/IRMS)对东海近岸泥质区、济州岛西南泥质区和冲绳海槽北部表层沉积物中正构烷烃的单体碳同位素组成及分布进行了分析。
3.
The stable carbon isotope compositions in plant leaves can be used to provide information of original carbon in soil organic matter and paleo-ecological evolutions, based on the good relationship between the stable carbon isotope compositions and water use efficiency in plants or plant productivity to some extent.
测定了青藏高原北部 13个地点 10 1份草本植物叶片碳同位素组成 (δ13C值 ) ,结果发现 ,植物叶片δ13C值的分布范围在 - 2 9。
补充资料:同位素组成
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性质:以重量或原子百分比表示的某元素中各同位素所占的比例。如氧的同位素组成为:16O=99.762%、17O=0.038%、18O=0.200%。自然界中,大部分元素具有稳定的同位素组成。同位素组成可变的元素主要是具放射性衰变而不断减少的元素、有放射成因同位素不断累积的元素及某些轻元素。

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