不同施肥条件下酸雨对土壤硝态氮淋失的影响

Effects of Acid Raid under the Different Conditions of Fertilization on Leaching of NO_3^--N Form Soils

通过室内土柱模拟试验,研究了不同施肥条件下酸雨对紫色土硝态氮淋失的影响。结果表明:酸雨和施肥对NO-3-N淋失都有影响。雨水pH值对中性紫色土硝态氮淋失的影响较为明显,表现为:酸雨pH值越低,土壤中硝态氮淋失越明显;酸性紫色土硝态氮的淋失随pH值的变化不明显;在雨水pH值相同,不同施肥条件下,土壤硝态氮淋失量的顺序为:有机+化肥>化肥>有机>对照。

The effect of acid rain and N fertilizer variety on leaching loss of NO_3^--N in purple soils has been studied by soil columns experiments. The results show that acid rain and N fertilizer variety affect leaching loss of NO_3^--N. To the neutral soil, the effect of pH on leaching loss of NO_3^--N is obvious,as follows:the lower the pH, the stronger the leaching loss of NO_3^--N;to the acidic soil is not very obvious.On the condition of the same of pH and different fertilization, the sequence of the leaching loss of NO_3^--N is:Organic manure+ Fertilizer>Fertilizer>Organic manure>Control treatment.