Chin J Plant Ecol ›› 2021, Vol. 45 ›› Issue (1): 85-95.DOI: 10.17521/cjpe.2020.0153
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XU Xiao-Hui1,2, DIAO Hua-Jie1,3, QIN Chu-Yi4, HAO Jie3, SHEN Yan1, DONG Kuan-Hu3, WANG Chang-Hui1,3,*()
Received:
2020-05-15
Accepted:
2020-07-17
Online:
2021-01-20
Published:
2020-09-03
Contact:
WANG Chang-Hui
Supported by:
XU Xiao-Hui, DIAO Hua-Jie, QIN Chu-Yi, HAO Jie, SHEN Yan, DONG Kuan-Hu, WANG Chang-Hui. Response of soil net nitrogen mineralization to different levels of nitrogen addition in a saline-alkaline grassland of northern China[J]. Chin J Plant Ecol, 2021, 45(1): 85-95.
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土壤特性 Soil property | 2017年本底值 Original value of 2017 |
---|---|
pH | 9.82 ± 0.11 |
土壤全碳含量 TC (g·kg-1) | 7.01 ± 1.02 |
土壤全氮含量 TN (g·kg-1) | 0.61 ± 0.04 |
土壤全碳与全氮含量的比 TC:TN | 11.57 ± 1.93 |
Table 1 Basic soil properties in the experiment sites in a saline-alkaline grassland sample plot of northern China (mean ± SE)
土壤特性 Soil property | 2017年本底值 Original value of 2017 |
---|---|
pH | 9.82 ± 0.11 |
土壤全碳含量 TC (g·kg-1) | 7.01 ± 1.02 |
土壤全氮含量 TN (g·kg-1) | 0.61 ± 0.04 |
土壤全碳与全氮含量的比 TC:TN | 11.57 ± 1.93 |
Fig. 2 Schematic diagram of experimental design in a saline-alkaline grassland of northern China. N0, N1, N2, N4, N8, N16, N24 and N32 indicated that the nitrogen addition levels were 0, 1, 2, 4, 8, 16, 24 and 32 g·m-2, respectively.
Fig. 3 Changes of soil NH4+-N, NO3--N and inorganic nitrogen concentration under different levels of nitrogen addition in 2017-2019 of a saline-alkaline grassland of northern China (mean + SE). Different lowercase letters indicate significant differences (p < 0.05). * means the difference is significant at the level of p < 0.05, and ** means the difference is significant at the level of p < 0.01. Different colors in the small picture correspond to different nitrogen addition levels in the histogram.
因素 Factor | 铵化速率 Ammonification rate | 硝化速率 Nitrification rate | 净氮矿化速率 Net nitrogen mineralization rate | |||
---|---|---|---|---|---|---|
F | p | F | p | F | p | |
年份 Year (Y) | 6.167 | <0.05 | 35.338 | <0.001 | 5.275 | <0.05 |
氮添加 Nitrogen addition (N) | 7.879 | <0.001 | 12.592 | <0.001 | 9.455 | <0.001 |
年份×氮添加 (Y × N) | 3.664 | <0.05 | 14.516 | <0.001 | 2.315 | <0.05 |
Table 2 Two-way ANOVA on the effects of nitrogen addition and year on soil net ammonification, nitrification and net nitrogen mineralization rates of the salinized grassland of northern China
因素 Factor | 铵化速率 Ammonification rate | 硝化速率 Nitrification rate | 净氮矿化速率 Net nitrogen mineralization rate | |||
---|---|---|---|---|---|---|
F | p | F | p | F | p | |
年份 Year (Y) | 6.167 | <0.05 | 35.338 | <0.001 | 5.275 | <0.05 |
氮添加 Nitrogen addition (N) | 7.879 | <0.001 | 12.592 | <0.001 | 9.455 | <0.001 |
年份×氮添加 (Y × N) | 3.664 | <0.05 | 14.516 | <0.001 | 2.315 | <0.05 |
Fig. 4 Seasonal dynamics of soil net N mineralization rates under different levels of nitrogen addition in a saline-alkaline grassland of northern China (mean ± SE). ** means the difference is significant at the level of 0.01. N0, N1, N2, N4, N8, N16, N24 and N32 indicated that the nitrogen addition levels were 0, 1, 2, 4, 8, 16, 24 and 32 g·m -2, respectively.
Fig. 5 Changes in soil net nitrogen (N) mineralization and net nitrification rates under different levels of N addition in a saline-alkaline grassland of northern China (mean + SE). Different lowercase letters indicate significant differences (p < 0.05).
Fig. 6 Sensitivity of soil net nitrogen (N) mineralization rate under different levels of N addition in a saline-alkaline grassland of northern China (mean + SE). Different lowercase letters indicate significant differences (p < 0.05) in the absolute value among different treatments.
Fig. 7 Correlation between net nitrogen (N) mineralization rates and soil temperature (ST), soil moisture (SM), pH and below- ground biomass (BGB) under different levels of N addition in a saline-alkaline grassland of northern China. p > 0.05 indicated that there was a significant correlation between the net N mineralization rate and soil indicators; p < 0.05 indicated that there was no significant correlation between the net nitrogen mineralization rate and soil indicators. N0, N1, N2, N4, N8, N16, N24 and N32 indicated that the nitrogen addition levels were 0, 1, 2, 4, 8, 16, 24 and 32 g·m -2, respectively.
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