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本试验旨在研究苹果、杏和油桃幼树及结果树在不同生长期对铵态氮(NH_4—N)和硝态氮(NO_3—N)的吸收;供试品种苹果为Topred(顶红),杏为Peeka(皮卡)、油桃为Nectared—9(油桃9号);施入的氮素均为同位素~(15)N。结果表明,对于幼树,三个树种在整个生长季节内都更易吸收NH_4—N;对于结果树,苹果树仍更易吸收NH_4—N,而油桃特别是杏树则更易吸收NO_3—N,并且主要在生长季节的后期吸收。在果实生长期,叶片、根、枝条和果实中的N的吸收总量下降,这可能是树体
The purpose of this experiment was to study the absorption of ammonium nitrogen (NH_4-N) and nitrate nitrogen (NO_3-N) in apple, apricot and nectarine saplings and fruit trees at different growth stages. The tested cultivars were Topred ), Apricot Peeka (pickup) and nectarine Nectared-9 (nectar 9). The nitrogen applied was all isotope ~ (15) N. The results showed that for the saplings, the three species were more likely to absorb NH_4-N throughout the growing season; the apple trees were still more likely to absorb NH_4-N, while the nectarines, especially the almonds, were more likely to absorb NO_3-N, and Mainly absorbed in the late growing season. During fruit growth, the total N uptake by leaves, roots, shoots and fruits decreased, probably as a result of the tree