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调查了施加氮肥(15NH4和15NO3)处理后在两个连续生长季内欧洲水青冈(Fagus sylvatica L.)幼苗地上部分和地下部分的生物量和营养元素分配。盆栽欧洲水青冈幼苗培养于温室大棚内,培养土样取自相邻的三种林分:欧洲水青冈,挪威赤松,欧洲水青冈-赤松混交林。结果表明,氮肥(15N)处理对欧洲水青冈营养元素分配没有显著影响,施加氮素形式决定自身流入植物库的情况。欧洲水青獭收氮素主要以硝态氮的形式,因此,尽管植物体内保存的硝态氮和氨态氮并没有统计差异,但是叶片中硝态氮明显减少。施加硝态氮对欧洲水青冈氮素恢复的影响要大于施加氨态氮。与欧洲水青冈茎、粗根相比,优质根系对氮素(15N)固定是一个缓慢过程。表8图1参40。
The biomass and nutrient allocation of aboveground and underground parts of Fagus sylvatica L. seedlings in two consecutive growing seasons after application of nitrogen fertilizers (15NH4 and 15NO3) were investigated. Potted European Miao Qingniao seedlings were cultured in greenhouse, cultivating soil samples taken from the adjacent three kinds of stands: Eucalyptus mongolicus, Norway red pine, European Fagusia - acacia mixed forest. The results showed that nitrogen (15N) treatment had no significant effect on the nutrient allocation in Fagusia. In the European water otter, the nitrogen is mainly in the form of nitrate nitrogen. Therefore, although there is no statistical difference between the nitrate nitrogen and the ammonia nitrogen stored in plants, the nitrate nitrogen in the leaves is obviously reduced. The application of nitrate nitrogen to the recovery of Nitraria gracile had greater effects than the application of ammonia nitrogen. Nitrate (15N) fixation was a slow process in high quality roots, compared with the stems and the coarse roots of European water hyacinth. Table 8 Figure 1 参 40.