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通过温室盆栽淋洗试验 ,研究了硫元素对蔬菜地土壤NO-3 淋溶损失和土壤无机氮含量的影响。结果表明 :在 12周试验期间 ,与对照相比 ,在种葱和不种葱条件下 ,硫元素处理土壤NO-3 N累积淋失量均降低 83%左右 ,NH+4 N累积淋失量分别增加 2 0 3和 2 4 9mg·pot-1,无机氮 (NH+4 N +NO-3 N)淋失量则均降低 6 0 %左右 ;试验结束后 ,其土壤无机氮浓度分别增高 82 7%和 74 8% ,且主要为NH+4 N。类似结果也在S2 O2 -3 处理中发现 ,但SO2 -4处理则无此现象。可见硫元素施入土壤后可抑制土壤氮的淋失 ,其作用机制是由硫元素氧化产生的S2 O2 -3 作用所致。鉴于S2 O2 -3 使用量是硫元素的 1 4倍 ,而后者效果仍然比前者好 ,因此认为硫元素是适用于蔬菜土壤的硝化抑制剂之一 ,特别是有效硫较低的土壤。
The greenhouse leaching experiments were conducted to study the effects of elemental sulfur on nitrate leaching loss and soil inorganic nitrogen in vegetable soils. The results showed that during the 12-week experiment, the cumulative leaching amount of NO-3 N in the soil treated with elemental sulfur decreased about 83% compared with the control, while the cumulative leaching amount of NH + 4 N The leaching amount of inorganic nitrogen (NH 4 + N + NO 3 N) decreased by about 60%, respectively. After the experiment, the concentrations of inorganic nitrogen in soil increased by 82% 7% and 74 8%, and mainly NH + 4N. Similar results were also found in the S2 O2 -3 treatment, but not in the SO2 -4 treatment. Visible sulfur element can inhibit the soil after the leaching of nitrogen, its mechanism is caused by the oxidation of sulfur element S2 O2 -3 role. Sulfur dioxide is considered as one of the nitrification inhibitors for vegetable soils, especially for soils with lower available sulfur, since S2 O2 -3 is 14 times more abundant than sulfur and the latter is still better than the former.