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首页> 外文期刊>Memoirs of the Queensland Museum >Modelling land based nutrients relating to Lyngbyamajuscula (Cyanobacteria) growth in Moreton Bay,southeast Queensland, Australia
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Modelling land based nutrients relating to Lyngbyamajuscula (Cyanobacteria) growth in Moreton Bay,southeast Queensland, Australia

机译：模拟与澳大利亚昆士兰州东南部莫顿湾Lyngbyamajuscula（蓝藻）生长相关的陆地养分

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摘要

Moreton Bay, in southeast Queensland, experiences seasonal blooms of the cyanobacterium,Lyngbya majuscula. Mounting evidence suggests nutrients can increase the intensityand severity of L. majuscula blooms when environmental conditions are favourable. Themain 'nutrients' of concern, are bio-available iron, phosphorus, nitrogen and dissolvedorganic carbon. The current study used a GIS-based model to generate a map identifyingareas most likely to supply/export nutrients of concern to Moreton Bay. Based on GIScoverages (acid sulfate soils, landuse, soils, groundwater, pre-clearing vegetation andremnant vegetation) and a proximity to coasts and streams coverage (to weight thelikelihood of export), parcels of land were ranked for hazard and compiled into a nutrienthazard model. The model was initially developed in a reference area (46,000ha)supported by field investigations, soil analyses and L. majuscule bioassay and laboratoryanalysis of groundwaters. The map outputs compared favourably with soil analyses from> 80 sites collected following model development. The model was extended beyond thereference area to produce an indicative nutrient hazard map of coastal SoutheastQueensland (2.3 million ha). The model and resulting maps from this investigationprovide an areal assessment of where to concentrate efforts to limit or reduce nutrientloads that may contribute to L. majuscula blooms. Maps produced from earlier modellinghave been used to support a new Algal Blooms policy 2.4.7 within the SoutheastQueensland Regional Coastal Management Plan (EPA, 2006) and versions in this paperprovide an update. Appropriate nutrient management guidelines need to be developedfor industry use when disturbing areas rated high or very high in the nutrient hazardmaps.
机译：在昆士兰州东南部的摩顿湾（Moreton Bay）经历了蓝藻（Lyngbya majuscula）的季节性开花。越来越多的证据表明，在有利的环境条件下，养分可以增加桃金娘花绽放的强度和严重性。关注的主要“营养素”是生物可利用的铁，磷，氮和溶解的有机碳。当前的研究使用基于GIS的模型来生成地图，该地图确定最有可能向莫顿湾供应/出口有关营养的区域。根据地理信息系统的覆盖面（酸性硫酸盐土壤，土地利用，土壤，地下水，预清除植被和残余植被）以及靠近海岸和溪流的覆盖范围（以出口的可能性为准），对土地进行危险等级排序，并编制成营养危害模型。该模型最初是在一个参考区域（46,000公顷）中开发的，该区域得到了实地调查，土壤分析以及玛氏乳杆菌的生物测定和地下水的实验室分析的支持。地图输出与模型开发后从80多个地点收集的土壤分析相比具有优势。该模型已扩展到参考区域以外，以产生东南昆士兰沿海（230万公顷）的指示性营养危害图。该研究的模型和结果图提供了一个区域评估，以集中精力限制或减少可能造成桃金娘花绽放的养分。由早期建模生成的地图已用于支持《东南昆士兰州区域沿海管理计划》（EPA，2006）中的新《藻华》政策2.4.7，并且本文中的版本也提供了更新。当扰动在养分危害图中评定为高或非常高的区域时，需要制定适当的养分管理指南以供工业使用。

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