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Effects of different nitrogen forms and concentrations on seedling growth traits and physiological characteristics of Populus simonii × P. nigra
Ist Teil von
Journal of forestry research, 2022-10, Vol.33 (5), p.1593-1606
Ort / Verlag
Singapore: Springer Nature Singapore
Erscheinungsjahr
2022
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Numerous growth and physiological variables of 3-week-old
Populus simonii
×
P. nigra
seedlings were assessed after treatment with either nitrate nitrogen (NO
3
−
–N) (0.1, 0.5, 1, 5, or 10 mmol·L
−1
) or ammonium nitrogen (NH
4
+
–N) (0.1, 0.5, 1, 5, or 10 mmol·L
−1
) to determine the best nitrogen form and concentration to optimize growth, biomass allocation, pigment content, and photosynthetic capacity. The results of combining membership function and an evaluation index suggested that, 5 mmol·L
−1
nitrogen, regardless of the form, yielded the highest comprehensive evaluation index and good growth. In addition, a Pearson correlation analysis and network visualization revealed that the total mass, shoot mass, root mass, leaf dry mass, plant height, leaf area, chlorophyll
a
and total chlorophyll had a physiological index connectivity degree ≥ 15 for both nitrogen forms. Net photosynthetic rate, stomatal conductance, transpiration rate, maximum photochemical efficiency of PSII, total nitrogen content, ground diameter, chlorophyll
b
, and carotenoid were unique indices for evaluating NH
4
+
–N-based nutrition, which could provide a theoretical basis for evaluating the effects of nitrogen fertilizer on seedlings, cultivation periods, and stress tolerance in
P. simonii
×
P. nigra
.