Carbon isotopic composition of Ambrosia and Artemisia pollen: assessment of a C₃-plant paleophysiological indicator.
Carbon isotopic composition of Ambrosia and Artemisia pollen: assessment of a C₃-plant paleophysiological indicator.
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豚草和蒿花粉的碳同位素组成：C₃-植物古生理指标的评估。
DOI：
10.1111/j.1469-8137.2012.04219.x
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
D. Nelson
中科院分区：
文献类型：
--
作者：
D. Nelson
关于植物生理性能的变化如何影响古记录中植被变化的证据有限。为了评估 C₃ 植物花粉的 δ13C 作为群落水平生理学指标，从草本植物标本中分离出少量（10-30 粒）未经处理的花粉和孢粉质，这些花粉和孢子花粉来自草本植物（A. tomentosa 和 A. psilostachya）和蒿属（A. frigida、A. ludoviciana 和 A. dracunculus）（草地花粉谱中丰富的属）。显微操作。它们的 δ13C 值是使用与同位素比质谱仪连接的绕线微燃烧装置测量的。还测量了叶子的 δ13C。将未经处理的花粉、孢粉质和叶子的碳同位素辨别力 (Δ) 与季节性降水量、蒸气压不足和帕尔默干旱严重指数 (PDSI) 的历史记录进行比较。每个物种未经处理的花粉和孢子花粉素之间都表现出正相关。孢粉质 Δ 与 PDSI 相关性最强。豚草叶片Δ和水分指标之间的相关性强于蒿。这些结果表明孢粉素 Δ 指示了 C₃ 植物的水分胁迫水平。因此，花粉的 δ13C 分析有望帮助解决重要的古生态问题，例如群落水平的生理学如何导致植被组成的变化。
There is limited evidence on how shifts in plant physiological performance influence vegetation variations in the paleorecord. To evaluate δ¹³C of pollen from C₃ plants as an indicator of community-level physiology, small quantities (10-30 grains) of untreated pollen and sporopollenin from herbarium specimens of Ambrosia (A. tomentosa and A. psilostachya) and Artemisia (A. frigida, A. ludoviciana and A. dracunculus), genera abundant in grassland pollen profiles, were isolated by micromanipulation. Their δ¹³C values were measured using a spooling-wire microcombustion device interfaced with an isotope-ratio mass spectrometer. Leaf δ¹³C was also measured. Carbon isotope discrimination (Δ) for untreated pollen, sporopollenin and leaves was compared with historic records of seasonal precipitation amount, vapor pressure deficit and the Palmer Drought Severity Index (PDSI). Each species showed positive correlations between Δ of untreated pollen and sporopollenin. Sporopollenin Δ was most strongly correlated with PDSI. Correlations among leaf Δ and moisture indicators were stronger for Ambrosia than Artemisia. These results suggest that sporopollenin Δ indicates the level of moisture stress in C₃ plants. Therefore, δ¹³C analysis of pollen promises to help address important paleoecological questions, such as how community-level physiology contributes to shifts in vegetation composition.
影响因子：
4.9
作者：
Wittmer, M. H. O. M.;Auerswald, K.;Schnyder, H.
通讯作者：
Schnyder, H.