设施栽培土壤有机质和氮素含量的积累规律

Accumulative regularity of organic matter and nitrogen content in sheltered ground

研究了不同土壤类型和棚龄的设施栽培土壤有机质和氮素含量的变化规律。结果表明：设施栽培土壤有机质、全氮和有效氮含量显著高于露地土壤。0～20cm±层分别提高16．5g／kg、1．02g／kg、55．52mg／kg，20～40cm土层分别高13.9g／kg、0．75g／kg、39．54mg／kg；且0～20cm土层明显高于20～40cm土层，增加量具有相同的趋势。在一定年限内随棚龄的延长。土壤有机质、全氮和有效氮含量增加．呈明显的积累现象。

This test researched the change of soil organic matter and nitrogen content in sheltered ground. The results showed that the contents of organic matter,total N and available N of sheltered ground were all higher than the contrast bare ground, which increased 16.5 g/kg, 1.02 g/kg and 55.52 mg/kg of 0-20 cm soil,and 13. 9 g/kg, 0. 75 g/kg and 39.54 mg/kg of 20-40 cm soil respectively;those contents of 0-20 cm soil were obviously higher than that of 20-40 cm soil with the same increase trend. The contents of organic matter, total N and available N of sheltered ground increased and accumulated obviously with the extend of planting years in certain years.