Carbon and Oxygen Isotopes in Trees: Tools to Study Assimilate Transport and Partitioning and to Assess Physiological Responses Towards the Environment
Carbon and Oxygen Isotopes in Trees: Tools to Study Assimilate Transport and Partitioning and to Assess Physiological Responses Towards the Environment
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DOI：
10.1007/978-3-642-13145-5_9
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发表时间：
2011-01-01
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影响因子：
--
通讯作者：
Gessler, Arthur
中科院分区：
文献类型：
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作者：
Gessler, Arthur
目前，对于植物生理过程、植物体内碳的转移、植物组织中碳的储存和再动员以及从根部向土壤释放碳如何与生态系统尺度的过程相互作用，还缺乏认识。在全球气候变化的背景下，我们需要将植物生理、生态系统与大气之间的CO2净交换和植物生物量积累机制联系起来。这是预测森林生产力及其未来固碳潜力的基础。本章将概述稳定同位素研究如何能够深入了解新吸收的碳在树木内部运输并转移到土壤和大气中的命运。本文综述了碳和氧同位素自然丰度时空变化特征的研究或同位素富集示踪剂的应用。此外，它还强调了一个事实，即在植物内部运输的同化物的稳定同位素组成包含了重要的环境条件、叶片生理和光合后代谢的时间整合信息。本文将一方面关注为植物呼吸和土壤微生物活动提供燃料的快速循环碳库，另一方面探讨树木年轮档案中同位素信息向长寿化合物的转移。
At present, there is lack of knowledge on how plant physiological processes, the transfer of carbon within the plant, carbon storage, and remobilization in the plant tissues as well as the release of carbon from the roots to the soil interact with ecosystem-scale processes. On the background of global climate change, we need to mechanistically link plant physiology, CO2 net exchange between ecosystems and the atmosphere and plant biomass accumulation. This is the basis for predictine productivity of forests as well as their carbon sequestration potential in future. This chapter will give an overview on how stable isotope studies can give insights into the fate of newly assimilated carbon transported within trees and transferred to the soil and atmosphere. The review includes studies either characterizing temporal and spatial variation in the natural abundance of carbon and oxygen isotopes or applying isotopically enriched tracers. In addition, it highlights the fact that the stable isotope composition of assimilates transported within the plant contains important time integrated information on environmental conditions, leaf physiology, and postphotosynthetic metabolism.This review will on the one hand focus on the fast turn over carbon pools, which fuel plant respiration and soil microbial activity and on the other hand explore the transfer of the isotope information to long-lived compounds in the tree-ring archive.