Repeated annual drought has minor long‐term influence on δ13C and alkane composition of plant and soil in model grassland and heathland ecosystems
Repeated annual drought has minor long‐term influence on δ13C and alkane composition of plant and soil in model grassland and heathland ecosystems
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每年重复的干旱对模型草原和荒地生态系统中植物和土壤的 δ13C 和烷烃组成具有较小的长期影响
DOI：
10.1002/jpln.201600019
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发表时间：
2017
影响因子：
2.5
通讯作者：
G. L. B.
中科院分区：
文献类型：
--
作者：
Srivastava;Jentsch;Glaser;Wiesenberg;G. L. B.
由于全球气候变化，预计未来欧洲干旱情况的发生率将增加，这也会影响植物的抗性。脂类是保护植物免受干旱胁迫的重要植物成分，有助于土壤中中间稳定碳库的形成。然而，干旱对植物-土壤系统中脂质循环的影响程度尚不清楚，因此，干旱后生态系统如何恢复仍是一个问题。我们集中研究了两个不同植物群落（温带草原和石楠荒原）的植物和土壤样本，这些植物群落已经暴露在5年4.5-6.0周的重复年度干旱中。他们在上一次干旱一年后取样，以检查植物-土壤系统的恢复情况。分析样品的体积碳、稳定碳、氮同位素（δ13C、δ15N）和脂质组成。与我们的预期相反，在模式生态系统中，5年重复的年度干旱对地上生物量、根系和土壤在元素（C和N浓度、C: N比）、体积同位素（δ13C、δ15N）组成和总可提取脂质浓度方面没有观察到强烈的影响。因此，在连续5年的年度干旱后，植物的C和脂质浓度及其组成没有发生显著变化。这可能与整个生长季节相对较短的干旱期有关，并为常年干旱的温带草原和石楠荒原模式生态系统C和脂质动态的恢复提供了证据。
As a result of global climate change the incidence of drought conditions in Europe is predicted to increase in the future, which also influences plant resistance. Lipids are important plant constituents that protect plants against drought stress and contribute to the intermediate stable carbon (C) pool in soil. However, the extent to which drought influences lipid cycling in the plant–soil system is unknown and, therefore, it remains questionable how the ecosystem recovers after drought. We focused on plant and soil samples from two different plant communities (temperate grassland and heathland) that had been exposed to 5 years of 4.5–6.0 weeks repeated annual drought. They were sampled one year after the last drought to check the recovery of the plant–soil system. Samples were analyzed for their bulk C, stable C and nitrogen (N) isotope (δ13C, δ15N) and lipid composition. Contrary to our expectation, no strong influence of five years of repeated annual drought was observed for above‐ground biomass, roots and soils in the model ecosystems with respect to elemental (C and N concentrations, C : N ratio) bulk isotope (δ13C, δ15N) composition and the total extractable lipid concentration. Thus, plants did not sustain a significant change in their C and lipid concentration as well as their composition after five years of repeated annual drought. This might be related to the comparatively short drought period related to the overall growth season and provides evidence for recovery of the C and lipid dynamics in temperate grassland and heathland model ecosystems exposed to annual drought.
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优化植物和土壤脂质的 14C 液体闪烁计数，以追踪脂质的短期形成、易位和降解
影响因子：
1.6
作者：
G. Wiesenberg;M. Gocke;Y. Kuzyakov
通讯作者：
Y. Kuzyakov
影响因子：
3
作者：
G. Wiesenberg;J. Schwarzbauer;M. Schmidt;L. Schwark
通讯作者：
G. Wiesenberg;J. Schwarzbauer;M. Schmidt;L. Schwark
影响因子：
3.8
作者：
Dungait, Jennifer A. J.;Docherty, Gordon;Evershed, Richard P.
通讯作者：
Evershed, Richard P.
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影响因子：
5.5
作者：
R. Lindborg
通讯作者：
R. Lindborg
影响因子：
56.9
作者：
Zhao, Maosheng;Running, Steven W.
通讯作者：
Running, Steven W.