Nitrogen fixation by Trichodesmium spp. in the Central and Northern Great Barrier Reef Lagoon:: relative importance of the fixed-nitrogen load
Nitrogen fixation by Trichodesmium spp. in the Central and Northern Great Barrier Reef Lagoon:: relative importance of the fixed-nitrogen load
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DOI：
10.3354/meps186119
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发表时间：
1999-01-01
影响因子：
2.5
通讯作者：
Uwins, P
中科院分区：
文献类型：
--
作者：
Bell, PRF;Elmetri, I;Uwins, P
在大堡礁泻湖（GBRL）的研究表明，Trichodesmium（Oscillatoria）spp。固定大量的大气氮和负荷的'新'氮介绍了束丝藻属。至少与通过河流排放进入的是同一等级的。其他属的浮游植物的增长，因此富营养化的GBRL的某些部分，现在可以在很大程度上是由这种“新”的氮原位生产驱动。毛束藻在GBRL中部比在GBRL北方多产，有证据表明，自1928-29年大堡礁低地群岛考察以来，毛束藻属的浓度有所增加。据推测，这种增加是由于河流携带的营养物质的增加，将促进氮固定（如磷，铁和溶解的有机物）。据估计，这种营养物质的负荷增加了几倍，因为昆士兰州的沿海集水区的发展。
Studies in the Great Barrier Reef Lagoon (GBRL) show that Trichodesmium (Oscillatoria) spp. fix significant amounts of atmospheric nitrogen and that the loads of 'new' nitrogen introduced by Trichodesmium spp. are at least of the same order as those entering via riverine discharge. The elevated growth of other genera of phytoplankton and hence eutrophication in some sections of the GBRL could now be largely driven by the in situ production of this 'new' nitrogen. Trichodesmium is more prolific in the Central GBRL than in the Northern GBRL and there is evidence that the concentrations of Trichodesmium spp, have increased since the 1928-29 Great Barrier Reef Expedition to Low Isles. It is hypothesised that this increase has resulted from increases in river borne nutrients that would promote N fixation (e.g. phosphorus, iron and dissolved organic matter). It is estimated that the loads of such nutrients have increased several fold since the development of the coastal catchments of Queensland.