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有机培肥土壤对优势流中养分淋失的影响

Keywords: 有机培肥,优势流,养分淋溶

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Abstract:

为研究有机培肥对土壤优势流中养分淋失的影响,采用原状土柱模拟淋溶的方法,对土壤优势流中养分淋失的情况进行研究。结果表明,土壤经有机培肥后,明显降低了优势流中各种养分的淋失速度,从而使养分的淋失总量减少,为未施秸秆处理的1/3左右。有机培肥土壤对于淋溶液中养分浓度的影响表现为,在淋溶液中养分浓度总体降低的同时,各种养分的浓度降低的幅度又有所不同,其中对水溶性K和铵离子的效果最明显,而对硝态氮(NO_3~--N)保持作用则相对差些。上述结果说明,有机培肥对减少土壤优势流造成的土壤养分淋失以及降低地下水污染都有一定的作用。

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