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定位试验结果表明,长期地膜覆盖对棕壤全氮影响较小,而碱解氮含量平均下降6.46mg/kg。覆膜土壤上层NO~-_3—N含量明显增加。有机氮各组分在覆膜条件下发生较大变化,其中氨基酸态氮的绝对和相对数量下降显著,各处理平均下降21.6mg/kg和2.0％。覆膜使土壤微生物体氮量增加。试验结果还表明,施用有机肥和化肥都能提高土壤全氮、碱解氮、NO~-_3—N和有机氮的含量,施用有机肥明显地提高了微生物体氮的含量,是培肥覆膜土壤氮素肥力的有效措施。
Positioning test results showed that the long-term plastic film mulching had less effect on total nitrogen in brown soil, while the content of alkaline hydrolysis nitrogen decreased 6.46mg / kg on average. The content of NO ~ -_3-N in the upper layer of the plastic film obviously increased. The content of organic nitrogen changed greatly under the condition of film mulching, in which the absolute and relative quantity of amino acid nitrogen decreased significantly, and the average reduction of each treatment was 21.6mg / kg and 2.0%. Film mulching increased soil microbial biomass nitrogen. The results also showed that the application of organic manure and chemical fertilizer can increase the content of soil total nitrogen, alkaline hydrolysis nitrogen, NO ~ -_3-N and organic nitrogen, and the application of organic manure obviously increased the nitrogen content of the microorganism, Effective measures of soil nitrogen fertility in soil.