Yang Ting, Zhong Quan-Lin, Li Bao-Yin, Cheng Dong-Liang, Xu Chao-Bin, Zhou Yu-Xing, Zhang Xue, Zhou Zong-Zhe
College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China.
Breeding Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China.
Ying Yong Sheng Tai Xue Bao. 2022 Jan;33(1):25-32. doi: 10.13287/j.1001-9332.202201.026.
Trees are characterized with selective absorption of different forms of nitrogen. Ammonium nitrogen (NH-N) and nitrate nitrogen (NO-N) are the main forms of nitrogen for plant absorption. We examined the differences of absorption between NH-N and NO-N for 1-year-old seedlings planted in local hilly red soil in a pot experiment. A controlled experiment with 7 different NH-N/NO-N treatments was conducted, to study the effects of nitrogen forms and different NH-N/NO-N ratios on the growth and leaf traits of seedlings. The results showed that there were no significant differences in the relative growth rate of ground diameter (GD), plant height (TH), and biomass (RGR) of seedlings with different NH-N/NO-N ratios for four months, but these parameters were relatively high under the treatment of NH-N:NO-N=5:5. The seedlings of didn't show obvious preference for NH-N and NO-N in short term. The extremely low NH-N/NO-N ratio application was unsuitable for their growth. Different NH-N/NO-N application had significant effects on leaf area (LA), specific leaf area (SLA), leaf dry matter content (LDMC), leaf relative water content (LRWC), net photosynthetic rate (), intercellular CO concentration (), water use efficiency (WUE), and photosynthetic nitrogen use efficiency (PNUE). seedlings under the treatment of NH-N:NO-N=1:9 had the highest LA, SLA, , WUE and PNUE. However, the seedlings under the treatment of NH-N:NO-N=9:1 had the lowest LDMC, leaf tissue density (LTD), LRWC and . Different NH-N/NO-N combined application did not affect leaf nitrogen content (LN) and leaf phosphorus content (LP), which were highest under the treatment of NH-N:NO-N=5:5. Across different NH-N/NO-N combined treatments, GD, TH, and RGR were significantly negatively correlated with SLA, while both GD and RGR were significantly negatively correlated with PNUE. Our results could provide theoretical basis for precise nutrient management and high-efficiency cultivation techniques during the seedling stage of the .
树木具有对不同形态氮素的选择性吸收特性。铵态氮（NH-N）和硝态氮（NO-N）是植物吸收氮素的主要形态。我们通过盆栽试验研究了种植于当地丘陵红壤中的1年生幼苗对NH-N和NO-N吸收的差异。进行了7种不同NH-N/NO-N处理的对照试验，以研究氮素形态和不同NH-N/NO-N比例对幼苗生长和叶片性状的影响。结果表明，不同NH-N/NO-N比例的幼苗在四个月内，地径（GD）、株高（TH）和生物量（RGR）的相对生长速率无显著差异，但在NH-N:NO-N = 5:5处理下这些参数相对较高。短期内，该幼苗对NH-N和NO-N未表现出明显偏好。极低的NH-N/NO-N比例施用不适于其生长。不同的NH-N/NO-N施用对叶面积（LA）、比叶面积（SLA）、叶片干物质含量（LDMC）、叶片相对含水量（LRWC）、净光合速率（ ）、胞间CO浓度（ ）、水分利用效率（WUE）和光合氮利用效率（PNUE）有显著影响。NH-N:NO-N = 1:9处理下的幼苗具有最高的LA、SLA、 、WUE和PNUE。然而，NH-N:NO-N = 9:1处理下的幼苗LDMC、叶片组织密度（LTD）、LRWC和 最低。不同的NH-N/NO-N组合施用不影响叶片氮含量（LN）和叶片磷含量（LP），二者在NH-N:NO-N = 5:5处理下最高。在不同的NH-N/NO-N组合处理中，GD、TH和RGR与SLA显著负相关，而GD和RGR均与PNUE显著负相关。我们的研究结果可为该植物幼苗期的精准养分管理和高效栽培技术提供理论依据。
