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首页> 外文期刊>Nature >Net transfer of carbon between ectomycorrhizal tree species in the field
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Net transfer of carbon between ectomycorrhizal tree species in the field

机译：田间外生菌根树种之间碳的净转移

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Different plant species can be compatible with the same species of mycorrhizal fungi and be connected to one another by a common mycelium. Transfer of carbon, nitrogen and phosphorus through interconnecting mycelia has been measured frequently in laboratory experiments, but it is not known whether transfer is bidirectional, whether there is a net gain by one plant over its connected partner, or whether transfer affects plant performance in the field. Laboratory studies using isotope tracers show that the magnitude of one-way transfer can be influenced by shading of 'receiver' plants, fertilization of 'donor' plants with phosphorus, or use of nitrogen-fixing donor plants and non-nitrogen-fixing receiver plants, indicating that movement may be governed by source-sink relationships. Here we use reciprocal isotope labelling in the field to demonstrate bidirectional carbon transfer between the ectomycorrhizal tree species Betula papyrifera and Pseudotsuga menziesii, resulting in net carbon gain by P. menziesii. Thuja plicata seedlings lacking ectomycorrhizae absorb small amounts of isotope, suggesting that carbon transfer between B. papyrifera and P. menziesii is primarily through the direct hyphal pathway. Net gain by P. menziesii seedlings represents on average 6% of carbon isotope uptake through photosynthesis. The magnitude of net transfer is influenced by shading of P. menziesii, indicating that source - sink relationships regulate such carbon transfer under field conditions.
机译：不同的植物物种可以与相同种类的菌根真菌兼容，并通过共同的菌丝体相互连接。通过相互连接的菌丝体进行的碳，氮和磷的转移在实验室实验中经常被测量，但是尚不清楚转移是否是双向的，一个植物是否比其相连的伙伴有净收益，或者转移是否会影响植物的性能。领域。使用同位素示踪剂的实验室研究表明，单向转移的幅度可能受“接收者”植物的遮荫，“供体”植物的磷肥或使用固氮供体植物和非固氮接收器植物的影响，表明移动可能受源库关系控制。在这里，我们在田间使用相互同位素标记来证明外生菌根树种桦木和假单胞菌之间的双向碳转移，从而导致门氏假单胞菌获得净碳。缺少外生菌根的金钟柏幼苗吸收少量的同位素，这表明B. papyrifera和P. menziesii之间的碳转移主要是通过直接的菌丝途径。 Menziesii幼苗的净增收平均代表通过光合作用吸收的碳同位素的6％。净转移量受孟氏疟原虫阴影的影响，表明源-汇关系调节了田间条件下的这种碳转移。

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