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长期以来,人们对氮肥长期施用对土壤性质的影响一直十分关注。因为长期施用化学氮肥如能增加土壤全氮含量将可以提高土壤的肥力水平,但同时,如果土壤中无机氮过分积累也会引起环境问题。有的研究指出,施用无机氮并不能使土壤有机质显著增加,但土壤可矿化氮量有较显著的增加。这是由于单施无机氮肥而增加的少量土壤有机氮比原来
The effect of long-term application of nitrogen fertilizer on soil properties has long been of great concern. Because long-term application of chemical nitrogen fertilizer can increase soil fertility if it can increase soil total nitrogen content, at the same time, excessive nitrogen accumulation in soil can cause environmental problems. Some studies have pointed out that the application of inorganic nitrogen does not significantly increase soil organic matter, but there is a significant increase in soil mineralizable nitrogen. This is due to the application of inorganic nitrogen fertilizer to increase the amount of soil organic nitrogen than the original