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Dynamics of mineral nutrient storage for mast reproduction in the tropical emergent tree Dryobalanops aromatica

机译：热带萌芽树Dryobalanops aromaa进行肥大繁殖的矿质养分存储动力学

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摘要

Limitations in resources are considered to be important in mass-fruiting trees, based on the speculation that they need to consume a large amount of stored resources in a very short period. To test this hypothesis, we studied the total reproductive costs per individual of the tree Dryobalanops aromatica (Dipterocarpaceae), and the dynamics of stored mineral nutrients, specifically nitrogen, phosphorus, and potassium; we then estimated the contribution of each of the stored resources to reproduction in a lowland dipterocarp forest in Sarawak, Malaysia. D. aromatica is an emergent and masting tree species, and it produced a large amount of mature fruit in a masting period running 2001-2002. The dynamics patterns were markedly different for each of the stored nutrients. The phosphorus concentration clearly decreased in the branch, stem and root during reproduction, but nitrogen fluctuated by only a small amount in any organ during this period. The potassium concentration fell in all organs during flowering, but even increased during fruit development. Stored phosphorus accounted for 67.7% of the total phosphorus requirements for reproduction, but nitrogen accounted for only 19.7%. Stored potassium did not appear to contribute anything, at least to fruit production. Our results suggest that D. aromatica supplies phosphorus needed for reproduction mainly from stored resources in the tree, unlike nitrogen or potassium. The accumulation of phosphorus could be the decisive factor in the occurrence and frequency of mast reproduction in the relatively poor soil conditions prevailing in the tropical rain forests of Southeast Asia.
机译：在推测果树需要在非常短的时间内消耗大量存储资源的基础上，资源限制在大果树中被认为是重要的。为了验证这一假设，我们研究了香果树（Dipterocarpaceae）每棵树的总繁殖成本，以及所储存的矿质养分的动态变化，特别是氮，磷和钾。然后，我们估计了每种储存资源对马来西亚沙捞越州低地龙脑森林繁殖的贡献。 D.aromatica是一种新兴的树种，在2001-2002年的树篱生长期间产生了大量成熟的果实。对于每种存储的养分，动力学模式明显不同。在繁殖过程中，树枝，茎和根中的磷浓度明显降低，但是在此期间，氮在任何器官中仅少量波动。开花期间所有器官中的钾浓度均下降，但在果实发育期间钾浓度甚至升高。储存的磷占繁殖所需总磷的67.7％，而氮仅占19.7％。储存的钾似乎没有任何作用，至少对水果产量没有贡献。我们的结果表明，与氮或钾不同，芳香果D.主要从树中存储的资源中提供繁殖所需的磷。在东南亚热带雨林普遍存在的相对较差的土壤条件下，磷的积累可能是影响桅杆繁殖的发生和频率的决定性因素。

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