In plant eco-physiology, less negative (enriched) carbon 13 ( ¹³C) in the leaves indicates conditions of reducing leaf gas exchange through stomata, e.g. under drought. In addition, ¹³C is expected to be less negative in non-photosynthetic tissues as compared with leaves. However, these relationships in δ ¹³C from leaves (photosynthetic organs) to branches, stems and roots (non- photosynthetic organs) are rarely tested across multiple closely related tree species, multiple compartments, or in trees growing under extreme heat and drought.

中文翻译：

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出乎意料的低δ ¹³下，在叶，枝，茎，三个金合欢树种的根在极度干旱的环境中成长

在植物生态生理学中，叶片中负（富集）碳13（¹³ C）较少，表明减少了通过气孔的叶片气体交换的条件，例如在干旱下。此外，与叶片相比，非光合作用组织中的¹³ C负值更低。然而，在这些δ关系¹³ C来自叶（光合器官）到分行，茎和根（非光合器官）在多个密切相关的树种，多间室，或在树上极端高温和干旱下生长很少进行测试。