Based on the monitoring data from 2002 - 2009, the spatial and temporal variation of the physicochemical indexes in Aha reservoir were analyzed, the results indicated that, the physicochemical indexes in Aha reservoir were characterized by obvious spatial and temporal variation, TP content increased from 0. 013 mg/L in 2002 to 0. 040 mg/L in 2009; the seasonal variation of TP and TN concentration was shown as summer ＞ spring ＞ winter ＞ autumn, while that of NH4-N was shown as winter ＜ summer ＜ autumn ＜ spring. The water quality in the middle of the reservoir was better than that in the northeast, but worse than that in the southwest. Chlorophyll a was positively correlated with TP, and negatively correlated with SD, but had no correlation with TN and NH4-N. The declining water transparency in Aha reservoir was directly caused by the increasing algae, which, moreover, indirectly resulted from the arising P concentration.%采用2002～2009年的监测数据,时阿哈水库理化指标的时空动态进行分析,结果表明,阿哈水库理化指标具有明显的时空分布特征,总磷(TP)从2002年的0.013mg/L增～2009年的0.040mg/L;季节上TP和总氮(TN)浓度为夏季>春季>冬季>秋季,氨氮(NH4-N)为冬季<夏季<秋季<春季;空间上水质库区中部优于库区东北部而较西南部差.叶绿素a与总磷呈线性显著正相关,与透明度(sD)呈极显著负相关,与TN、NH4-N不相关.藻类数量增加是2009年透明度下降的直接影响因子,磷浓度升高促进藻类增加是重要的间接影响因子.
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