溪流相邻高地通过地下径流向溪流中N素的输入，主要是以硝态氮的形态通过土壤水的输入；
N in the main form of nitrate through the subsurface runoff was put into the stream, the vegetation-covered riparian had high on the nutrient in the soil water.
监测地表水和土壤水中的铝形态及浓度变化是问题的关键。
The key of the problem is to monitor species and concentration of Aluminum in surface and soil water.
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