Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (2): 48-57.doi: 10.11707/j.1001-7488.LYKX20220073
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Qianyuan Liu1(),Yifan Chen3,Yanmei Chen1,Huimin Wang2,*
Received:
2022-02-10
Online:
2023-02-25
Published:
2023-04-27
Contact:
Huimin Wang
E-mail:liuqianyuan333@126.com
CLC Number:
Qianyuan Liu,Yifan Chen,Yanmei Chen,Huimin Wang. Effects of Different Ammonium to Nitrate Ratios on Nitrogen Uptake Preference and Traits of Absorptive Roots of Subtropical Trees Seedlings[J]. Scientia Silvae Sinicae, 2023, 59(2): 48-57.
Table 1
The height and ground diameter of plants in the initial stage"
铵硝比NH4+∶NO3? | 高度Height /cm | 地径Ground diameter /mm | |
湿地松Pinus elliottii | 15∶1 | 23.06±1.30 | 4.81±0.18 |
8∶8 | 22.75±1.16 | 4.51±0.17 | |
1∶15 | 21.00±0.53 | 4.61±0.12 | |
马尾松 Pinus massoniana | 15∶1 | 26.88±1.37 | 3.45±0.12 |
8∶8 | 26.88±2.02 | 3.47±0.26 | |
1∶15 | 23.00±1.65 | 3.13±0.14 | |
深山含笑Michelia maudiae | 15∶1 | 72.19±3.48 | 6.65±0.34 |
8∶8 | 75.31±3.57 | 7.17±0.13 | |
1∶15 | 68.60±3.91 | 7.28±0.33 | |
枫香Liquidambar formosana | 15∶1 | 75.33±3.22 | 5.35±0.26 |
8∶8 | 83.08±3.64 | 5.06±0.16 | |
1∶15 | 80.20±1.66 | 5.79±0.29 |
Table 2
Multi-way analysis of variance (ANOVA) to test the effects of tree species, NH4+/NO3?, and N form on N uptake rates by plants"
因素 Factors | 平均值 Mean Square | 自由度 Df | F 值 F value | P 值 P value |
树种 Tree species | 2040.94 | 3 | 136.05 | < 0.001 |
铵硝比 NH4+/NO3? | 169.29 | 2 | 11.29 | < 0.001 |
氮形态 N form | 250.62 | 1 | 16.71 | < 0.001 |
树种×铵硝比 Tree species × NH4+/NO3? | 96.98 | 6 | 6.47 | < 0.001 |
树种×氮形态 Tree species × N form | 73.44 | 3 | 4.90 | 0.004 |
铵硝比×氮形态 NH4+/NO3? × N form | 2785.03 | 2 | 185.65 | < 0.001 |
树种×铵硝比×氮形态 Tree species × NH4+/NO3? × N form | 432.43 | 6 | 28.83 | < 0.001 |
误差 Error | 15.00 | 72 |
Fig.1
NH4+-N and NO3?- N uptake rates and their ratios of different plants in substrates with different NH4+/NO3? PE means Pinus elliottii, PM means Pinus massoniana, MM means Michelia maudiae, and LF means Liquidambar formosana. The same below. Lowercase letters represent significant differences of uptake rates for different N forms by the same species, and uppercase letters represent significant differences among three ratios of ammonium to nitrate in the same species. Asterisk represents significant: *** means P < 0.001, ** means P < 0.01, * means P < 0.05."
Fig.2
The percent of N uptake amount in root, stem, and root to total N uptake amount (%) Pictures with a-d were the percent of ammonium nitrogen absorbed by plants in each organ, while e-h mean the percent of nitrate nitrogen. Lowercase letters indicate the significant difference between three ratios of ammonium to nitrate in the same organ, and unmarked letters mean no significant differences."
Table 3
Two-way analysis of variance (ANOVA) to test the effects of tree species and NH4+/NO3? on traits of plant absorptive roots"
P值 P value因素 Factor | 直径Diameter | 比根长Specific root length | 比表面积Specific surface area | 组织密度Root tissue density | 分支比Branching ratio | 分支强度 Branching intensity |
铵硝比 NH4+/NO3? | 0.68 | 0.023 | 0.022 | 0.463 | 0.053 | 0.410 |
树种 Tree species | < 0.001 | < 0.001 | < 0.001 | 0.001 | < 0.001 | < 0.001 |
树种×铵硝比 Tree species × NH4+/NO3? | 0.515 | 0.030 | 0.045 | 0.429 | 0.905 | 0.708 |
Fig.3
The functional traits of plant absorptive roots with different NH4+/NO3? Lowercase letters represent significant differences among three ratios of ammonium to nitrate of the same species, uppercase letters represent significant differences among four tree species, and unmarked letters mean no significant differences."
Fig.4
The Pearson correlation plot of biomass, N uptake rate, morphological and architectural traits of absorptive roots and substrate NH4+/NO3? a. Pinus elliottii; b. Pinus massoniana; c. Michelia maudiae; d. Liquidambar formosana; e. Coniferous species; f. Broad-leaved species; g. All species. SNR represents the ratio of substrate ammonium nitrogen to nitrate nitrogen, AMU represents uptake rate of ammonium nitrogen, NTU represents uptake rate of nitrate nitrogen, INU represents uptake rate of inorganic nitrogen, AD represents average diameter of absorptive root, SRL represents specific root length, SSA represents specific surface area of absorptive root, RTD represents density of root tissue, BR represents branching ratio, BI represents branching intensity, RB represents root biomass, SB represents the stem biomass, LB represents leaf biomass and TB represents the total plant biomass. *** means P < 0.001, ** means P < 0.01, and * means P < 0.05."
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