一、土壤中氮素的存在形态及其转化: 土壤是由岩石经一系列风化作用和复杂的成土作用形成的。岩石本身并不含氮素,土壤中的氮素是在土壤形成过程中经人类的活动、生物的作用逐渐累积起来的,使土壤具有肥力。土壤中的氮素绝大多数呈有机状态存在,因此土壤的含氮量常随土壤有机 First, the form of nitrogen in soil and its transformation: the soil is formed by a series of rock weathering and complex soil formation. The rock itself does not contain nitrogen, the soil nitrogen is in the process of soil formation by human activity, the gradual accumulation of the role of biological, make the soil fertile. The vast majority of nitrogen in the soil organic state exist, so the soil nitrogen content often with the soil organic