Effects of experimental sulfate additions on nutrient cycling, cyanobacterial abundance and mercury methylation in Lake 227, experimental lakes area

我们建议在安大略西北部实验湖区的一个无鱼的偏远湖泊--人工富营养化湖227中添加全湖硫酸钠，该湖自1990年以来只接受磷，以研究与富营养化管理、汞生物累积和道路盐影响有关的几个主要问题。我们假设，不同的硫酸盐水平在富营养化的湖泊在加拿大占大部分的化学和生物的变化，湖泊的反应。该实验将研究（1）硫酸盐调节湖泊沉积物内部磷和铁负荷的程度，这反过来，（2）控制讨厌的蓝藻水华的形成，以及（3）硫酸盐调节甲基汞形成速率的程度。(4)该实验需要氯化钠（即，道路盐）控制，因此一个实验将研究四个环境问题。

We are proposing a whole-lake sodium sulfate addition to a fishless, remote lake in the Experimental Lakes Area in Northwestern Ontario - artificially eutrophic Lake 227 which has received only phosphorus since 1990 to study several major questions related to eutrophication management, mercury bioaccumulation and road salt impacts. We hypothesize that varying sulfate levels in eutrophic lakes across Canada accounts for much of the chemical and biological variation in lake responses. The experiment will examine (1) the extent to which sulfate regulates internal phosphorus and iron loading from lake sediments which in turn, (2) control formation of nuisance cyanobacteria blooms, and (3) the extent to which sulfate regulates methylmercury formation rates. (4) This experiment requires a sodium chloride (i.e., road salt) control and thus one experiment will investigate four environmental problems.