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Phosphorus allocation to and resorption from leaves regulate the residence time of phosphorus in above‐ground forest biomass on Mount Kinabalu, Borneo
Functional Ecology ( IF 4.6 ) Pub Date : 2020-05-12 , DOI: 10.1111/1365-2435.13574 Yuki Tsujii 1, 2 , Shin‐ichiro Aiba 3 , Kanehiro Kitayama 1
中文翻译：
磷在叶片中的分配和吸收对磷在婆罗洲京那巴鲁山地上森林生物量中的停留时间进行了调节
更新日期：2020-05-12
Functional Ecology ( IF 4.6 ) Pub Date : 2020-05-12 , DOI: 10.1111/1365-2435.13574 Yuki Tsujii 1, 2 , Shin‐ichiro Aiba 3 , Kanehiro Kitayama 1
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- The residence time of phosphorus (P) in trees is a consequence of plant adaptation to P deficiency, with longer P residence time on soils with low P availability. P residence time has been studied at the leaf or canopy level but seldom at the whole‐tree level. Whereas P residence time at the leaf or canopy level is largely determined by leaf longevity and the resorption of P before leaf abscission, P residence time at the whole‐tree level will also be influenced by differences in P allocation to different plant parts because leaves and woody organs have distinct longevities.
- We estimated the residence time of P in above‐ground tree biomass (AGB) as the ratio of P mass (i.e. leaves plus wood) to the annual flux of P via litterfall (i.e. fine litter plus coarse woody debris) for seven tropical rain forests with different soil P availabilities on Mount Kinabalu, Borneo. We analysed the effects of P allocation to and resorption from leaves on P residence time along a soil P gradient.
- P residence time (2.7–9.8 years) was approximately one‐fifth of biomass residence time (AGB/annual litterfall mass; 19.8–48.8 years). This was due to a disproportionately greater relative allocation of P to leaves (P mass in leaves/P mass in AGB; 0.11–0.46), which had a smaller fraction of biomass (leaf biomass/AGB; 0.02–0.05) but a shorter longevity (1.0–1.8 years).
- The relative allocation of P to leaves was often high on low‐P soils, and P residence time was expected to be short. By contrast, the resorption rate of P from leaves was also high on low‐P soils, which extended P residence time with P deficiency. Consequently, P residence time was nearly constant across the forests.
- The short residence time of P relative to biomass indicates that P residence time depends largely on relative P allocation among plant organs. Similar P residence times among sites were maintained because greater P allocation to leaves on low‐P soils was effectively offset by higher P‐resorption efficiency.
中文翻译：
磷在叶片中的分配和吸收对磷在婆罗洲京那巴鲁山地上森林生物量中的停留时间进行了调节
- 磷（P）在树木中的停留时间是植物适应磷缺乏的结果，磷在低磷有效性土壤上的停留时间更长。在叶片或树冠层研究了P的停留时间，但在整棵树上很少研究。尽管在叶片或冠层水平上的磷停留时间主要取决于叶片的寿命和叶片脱落前对磷的吸收，但在整棵树水平上的磷停留时间也将受到不同植物对磷分配的影响，因为叶片和叶片木本器官具有独特的寿命。
- 我们估算了七种热带雨林中磷在地上树生物量（AGB）中的停留时间为磷质量（即叶子加木材）与通过凋落物（即细垃圾加粗木屑）产生的磷的年通量之比。婆罗洲的京那巴鲁山具有不同的土壤磷有效性。我们分析了土壤中磷沿土壤P梯度的分配对叶片分配和磷吸收的影响。
- P的停留时间（2。7-9。8年）约为生物质停留时间的五分之一（AGB /年凋落物质量； 19。8-48。8年）。这是由于磷在叶片上的相对分配比例过大（叶片中的磷质量/ AGB中的磷质量； 0.11-0.46），而生物量所占比例较小（叶生物量/AGB；0.02-0.05），但寿命较短（1.0-1.8年）。
- 在低磷土壤上，磷在叶片上的相对分配通常较高，并且磷的停留时间预计较短。相比之下，在低磷土壤上，叶片对磷的吸收速率也很高，这会延长磷缺乏时的磷停留时间。因此，磷在森林中的停留时间几乎恒定。
- P相对于生物质的短停留时间表明P停留时间主要取决于植物器官之间的相对P分配。磷在不同位点之间的停留时间保持相似，因为低磷土壤上更多的磷分配到叶片上可以被较高的磷吸收效率有效地抵消。
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