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首页> 外文期刊>Plant and Soil >Timing of nitrogen uptake affects winter storage and spring remobilisation of nitrogen in nectarine (Prunus persica var. nectarina) trees
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Timing of nitrogen uptake affects winter storage and spring remobilisation of nitrogen in nectarine (Prunus persica var. nectarina) trees

机译：氮素吸收的时间会影响油桃树（Prunus persica var。nectarina）树木中氮的冬季储存和春季迁移。

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Two-year old nectarine trees (Prunus persica, Batsch, var. nectarina, cv. Starkredgold on GF305 rootstock) planted in pots each received five applications of 1.0 g 15N labelled urea either from mid May to mid July (early uptake) or from mid August to the beginning of October (late uptake). All trees were supplied with a corresponding amount of unlabelled urea when they did not receive the labelled N. In autumn, all abscised leaves were collected and during winter randomly selected trees were harvested and divided into main organs. The remaining trees were transplanted into similar pots filled with sand; they received no N fertilizer and were harvested in May to evaluate the remobilization of N. Total N and 15N abundance were determined in each organ. Nectarine trees took up similar amounts of N in the 'early' and in the 'late' period; however, more labelled nitrogen was recovered in the perennial organs during the winter when trees received the labelled N in the 'late' than in the 'early' period.Some 73-80% of the N present in the dormant trees was stored in the roots, which contained almost twice the amount of labelled N taken up 'late' than that absorbed 'early'. Nitrogen for spring growth was remobilized predominantly from the roots and accounted for some 43-49% of the labelled N recovered in the tree during winter. Results suggest that the nitrogen taken up 'late' in the season is preferentially stored in roots and used by peach trees to sustain new growth the following spring.
机译：种植在盆中的两岁老油桃树（李属桃树，Batsch，var.nectarina，cv.Starkredgold在GF305砧木上）从5月中旬至7月中旬（早期吸收）或从中期开始接受了五次1.0 g 15N标记尿素的施用。 8月至10月初（后期吸收）。当所有树木均未接收到标记的N时，将为其提供相应量的未标记尿素。在秋季，收集了所有无叶的叶子，在冬季，收获了随机挑选的树木并将其分为主要器官。剩下的树木被移植到装满沙子的类似花盆中。他们没有施氮肥，于5月收获以评估其氮的转运。测定每个器官的总氮和15N丰度。油桃树在“早期”和“晚期”吸收的氮含量相近。然而，冬季树木在“晚期”比“早期”接收到标记的氮时，在多年生器官中回收的标记氮更多。休眠树中存在的氮的约73-80％储存在树木中。根，其吸收的“后期”标记氮几乎是吸收的“早期”氮的两倍。春季生长所需的氮主要从根部转移出来，约占冬季树木中回收的标记N的43-49％。结果表明，该季节“后期”吸收的氮优先存储在根中，桃树利用其来维持次年春季的新生长。

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