Suppr超能文献

中国东北松嫩平原农牧交错区夜间叶片呼吸产生二氧化碳的碳同位素组成

Carbon Isotope Composition of Nighttime Leaf-Respired CO2 in the Agricultural-Pastoral Zone of the Songnen Plain, Northeast China.

作者信息

Cui Haiying, Wang Yunbo, Jiang Qi, Chen Shiping, Ma Jian-Ying, Sun Wei

机构信息

Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun, Jilin Province, P. R. China, 130024.

State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, P. R. China, 100093.

出版信息

PLoS One. 2015 Sep 10;10(9):e0137575. doi: 10.1371/journal.pone.0137575. eCollection 2015.

Abstract

Variations in the carbon isotope signature of leaf dark-respired CO2 (δ13CR) within a single night is a widely observed phenomenon. However, it is unclear whether there are plant functional type differences with regard to the amplitude of the nighttime variation in δ13CR. These differences, if present, would be important for interpreting the short-term variations in the stable carbon signature of ecosystem respiration and the partitioning of carbon fluxes. To assess the plant functional type differences relating to the magnitude of the nighttime variation in δ13CR and the respiratory apparent fractionation, we measured the δ13CR, the leaf gas exchange, and the δ13C of the respiratory substrates of 22 species present in the agricultural-pastoral zone of the Songnen Plain, northeast China. The species studied were grouped into C3 and C4 plants, trees, grasses, and herbs. A significant nocturnal shift in δ13CR was detected in 20 of the studied species, with the magnitude of the shift ranging from 1‰ to 5.8‰. The magnitude of the nighttime variation in δ13CR was strongly correlated with the daytime cumulative carbon assimilation, which suggests that variation in δ13CR were influenced, to some extent, by changes in the contribution of malate decarboxylation to total respiratory CO2 flux. There were no differences in the magnitude of the nighttime variation in δ13CR between the C3 and C4 plants, as well as among the woody plants, herbs and graminoids. Leaf respired CO2 was enriched in 13C compared to biomass, soluble carbohydrates and lipids; however the magnitude of enrichment differed between 8 pm and 4 am, which were mainly caused by the changes in δ13CR. We also detected the plant functional type differences in respiratory apparent fractionation relative to biomass at 4 am, which suggests that caution should be exercised when using the δ13C of bulk leaf material as a proxy for the δ13C of leaf-respired CO2.

摘要

在单个夜晚内,叶片暗呼吸二氧化碳的碳同位素特征(δ13CR)存在变化是一种广泛观察到的现象。然而,尚不清楚在δ13CR的夜间变化幅度方面是否存在植物功能型差异。如果存在这些差异,对于解释生态系统呼吸稳定碳特征的短期变化以及碳通量的分配将具有重要意义。为了评估与δ13CR夜间变化幅度和呼吸表观分馏相关的植物功能型差异,我们测量了中国东北松嫩平原农牧交错区22种植物的δ13CR、叶片气体交换以及呼吸底物的δ13C。所研究的物种被分为C3和C4植物、乔木、草本植物和草本。在20个研究物种中检测到δ13CR存在显著的夜间变化,变化幅度在1‰至5.8‰之间。δ13CR的夜间变化幅度与白天累积碳同化密切相关,这表明δ13CR的变化在一定程度上受到苹果酸脱羧对总呼吸二氧化碳通量贡献变化的影响。C3和C4植物之间以及木本植物、草本植物和禾本科植物之间,δ13CR的夜间变化幅度没有差异。与生物量、可溶性碳水化合物和脂质相比,叶片呼吸的二氧化碳富含13C;然而,8点至4点之间的富集幅度有所不同,这主要是由δ13CR的变化引起的。我们还检测到凌晨4点时相对于生物量的呼吸表观分馏存在植物功能型差异,这表明在使用整片叶子材料的δ13C作为叶片呼吸二氧化碳的δ13C替代指标时应谨慎。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8e5b/4565631/5deab4c2417e/pone.0137575.g001.jpg

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验