Nitrogen use efficiency of Quercus serrata seedlings under different soil nitrogen and phosphorus supplies
Nitrogen use efficiency of Quercus serrata seedlings under different soil nitrogen and phosphorus supplies
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DOI：
10.2480/agrmet.d-19-00032
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发表时间：
2020
影响因子：
1.3
通讯作者：
Ben-Wei Zhu;T. Izuta;Makoto Watanabe
中科院分区：
文献类型：
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作者：
Ben-Wei Zhu;T. Izuta;Makoto Watanabe
氮利用效率（NUE）定义为生物量生长与从土壤中吸收的氮（N）的比率，广泛用于植物氮经济的评价。我们对不同土壤氮和磷（P）水平下的锯齿栎幼苗进行了施肥实验，以确定不同磷利用率下高氮沉降水平对NUE的影响，以及NUE组成部分N生产率（NP）和N平均停留时间（MRT）。幼苗在盆栽土壤中在三个氮水平（0、50和100公斤氮·公顷）和两个磷水平（0和50公斤磷·公顷）下生长一个生长季。向土壤供应氮会降低 NP 和 MRT，从而降低 NUE，而 P 供应则提高 NUE。尽管磷供应对氮素水平增加时NUE的降低没有显着影响，但它影响了NUE各组成部分对N素水平增加的响应。在叶片内，氮供应降低了光合氮利用效率（PNUE），磷缓解了这种降低。因此，P被认为是决定高施氮影响下锯缘青栎NUE变化的关键因素之一。
Nitrogen use efficiency (NUE), defined as the ratio of biomass growth and the nitrogen (N) taken up from a soil, is widely used in the evaluation of plant N economy. We conducted a fertilization experiment with Quercus serrata seedlings under different soil N and phosphorus (P) levels to determine the influence of high N deposition levels under different P availabilities upon NUE, plus the NUE components N productivity (NP), and mean residence time of N (MRT). The seedlings were grown for one growing season in the potted soil under three N levels (0, 50, and 100 kg N ha) combined with two P levels (0 and 50 kg P ha). Nitrogen supply to the soil reduced NUE by decreasing NP and MRT, whereas P supply enhanced NUE. Although P supply did not have a significant influence on the reduction of NUE with increasing N levels, it affected the response of the NUE components with increasing N levels. Within leaves, N supply reduced the photosynthetic nitrogen use efficiency (PNUE), P alleviated this reduction. Therefore, P is considered as one of the key factors determining the change of NUE in Q. serrata under the influence of high N supply.