Abrupt increase in phosphorus and potassium fluxes during a masting event in a Bornean tropical forest

Abrupt increase in phosphorus and potassium fluxes during a masting event in a Bornean tropical forest
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婆罗洲热带森林中磷和钾通量突然增加

DOI:
10.1007/s11284-018-1642-9
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发表时间:
2018
影响因子:
2
通讯作者:
Kitayama Kanehiro
Kitayama Kanehiro
中科院分区:
环境科学与生态学4区
文献类型:
--
作者:
Aoyagi Ryota;Imai Nobuo;Hidaka Amane;Samejima Hiromitsu;Kitayama Kanehiro

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热带生态系统的生产力受到营养物质限制的机制是一个长期存在的问题,但在东南亚万年青雨林中支持桅杆现象的营养动力学方面的信息很少。在这项研究中,我们研究了营养库和潜在的营养源桅杆在婆罗洲热带森林。我们调查,如果养分通量在细凋落物,树干,和土壤的时间变化,以响应激烈的花和水果生产。在开花开始时(2010年4月),在2公顷的地块上安装了55个凋落物收集器,并对凋落物和营养物质通量进行了4年多的监测(2010年5月至2014年12月)。树干的木芯和丰富的物种的粗根(Shoreaspp。)在2010年5月、2010年9月和2011年9月(分别与开花高峰期、结果高峰期和结果后1年一致)采集土壤样品。P和K通量在总凋落物中显着大于在肥大年(2010年)比非肥大年,而镁,氮,钙通量并没有改变肥大。与养分通量相一致的是,S. 2011年9月,多花减少。目前的研究结果表明,热带树木需要大量的P和K的桅杆,并可能重新分配存储的营养物质,以满足桅杆营养需求的升高。
Mechanisms by which the productivity of tropical ecosystems is limited by nutrients is a long-standing question, but little information is available on the nutrient dynamics supporting the masting phenomenon in Southeast Asian evergreen rainforests. In this study we examined the nutrient sink and potential nutrient sources of masting in a Bornean tropical forest. We investigated if nutrient flux in fine litter, tree stems, and soils changed temporally in response to intense flower and fruit production. Fifty-five litter traps were installed in a 2-ha plot at the onset of flowering (April 2010), and litter and nutrient fluxes were monitored for more than 4 years (May 2010–December 2014). Wood cores of trunks and coarse roots of abundant species (Shoreaspp.) and soil samples were collected in May 2010, September 2010, and September 2011 (coinciding with peak flowering, peak fruiting, and 1 year after fruiting, respectively). The P and K fluxes in the total litter were significantly greater in the mast year (2010) than non-mast years, whereas the Mg, N, and Ca fluxes did not vary in relation to masting. In line with the nutrient fluxes, P and K concentrations in coarse roots of flowering individuals ofS. multifloradecreased in September 2011. The present results suggest that tropical trees require extraordinary amounts of P and K for masting, and may retranslocate stored nutrients to meet the elevated nutrient demands for masting.
马来西亚沙捞越州一般开花期的小叶望天树(Mutica 科,龙脑香科)的甲虫授粉。
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