Reche Maria Helena L R, Machado Vilmar, Saul Danilo A, Macedo Vera R M, Marcolin Elio, Knaak Neiva, Fiuza Lidia M
Laboratório de Microbiologia e Toxicologia, Universidade do Vale do Rio dos Sinos, São Leopoldo, RS, Brazil.
Estação Experimental do Arroz, IRGA, Cachoeirinha, RS, Brasil.
An Acad Bras Cienc. 2016 Mar;88(1):361-75. doi: 10.1590/0001-3765201620140466. Epub 2016 Mar 4.
This paper presents the results of the statistical analysis of microbiological, physical and chemical parameters related to the quality of the water used in rice fields in Southern Brazil. Data were collected during three consecutive crop years, within structure of a comprehensive monitoring program. The indicators used were: potential hydrogen, electrical conductivity, turbidity, nitrogen, phosphorus, potassium, calcium, total and fecal coliforms. Principal Component and Discriminant Analysis showed consistent differences between the water irrigation and drainage, as the temporal variation demonstrated a clear reduction in the concentration of most of the variables analyzed. The pattern of this reduction is not the same in the two regions - that is, the importance of each of the different variables in the observed differentiation is modified in two locations. These results suggested that the variations in the water quality utilized for rice irrigation was influenced by certain specific aspects of each rice region in South Brazilian - such as anthropic action or soil/climate conditions in each hydrographic basin.
本文展示了巴西南部稻田用水质量相关微生物、物理和化学参数的统计分析结果。数据是在连续三个作物年度内，于一个全面监测项目的框架内收集的。所使用的指标有：酸碱度、电导率、浊度、氮、磷、钾、钙、总大肠菌群和粪大肠菌群。主成分分析和判别分析表明灌溉水与排水之间存在一致差异，因为时间变化显示大部分分析变量的浓度明显降低。这种降低模式在两个地区并不相同——也就是说，在观察到的差异中，每个不同变量的重要性在两个地点有所改变。这些结果表明，巴西南部各水稻种植区的某些特定方面——如每个水文流域的人为活动或土壤/气候条件——会影响用于水稻灌溉的水质变化。
