Effects of Temperature and Humidity on Soil Gross Nitrogen Transformation in a Typical Shrub Ecosystem in Yanshan Mountain and Hilly Region
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Site Description
2.2. Soil Sampling and Experimental Design
2.3. Measurements of Gross N Transformation Rates
2.4. Measurements of Soil Properties
2.5. Data Processing and Statistical Analysis Methods
3. Results
3.1. Soil Properties
3.2. Changes of 15N Enrichments and Soil Inorganic N Concentrations during the Incubation Period
3.3. Gross N Transformation Rates under Different Incubation Temperatures
3.4. Gross N Transformation Rates under Different Soil Moisture Conditions
4. Discussion
4.1. Errors of NH4+ Immobilization Rates and a Possibility of Heterotrophic Nitrification
4.2. Effect of Temperature on Soil Gross N Transformation Rates
4.3. Effect of Soil Moisture on Gross N Transformation Rates
4.4. Effect of Soil Depth on Gross N Transformation Rates
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Soil Depth | SL10 | SL20 |
---|---|---|
WHC (%) | 53.1 ± 1.5 a | 49.6 ± 1.5 a |
pH | 7.4 ± 0.4 a | 7.5 ± 0.2 a |
Clay (%) | 6.8 ± 1.1 a | 7.6 ± 1.0 a |
Silt (%) | 28.1 ± 4.0 a | 30.3 ± 4.4 a |
Sand (%) | 65.1 ± 3.7 a | 62.2 ± 4.5 a |
SOC (g kg−1) | 19.1 ± 1.5 a | 14.0 ± 1.3 b |
TN (g kg−1) | 1.81 ± 0.09 a | 1.38 ± 0.08 b |
WSOC (mg C kg−1 sdw) | 11.7 ± 0.9 a | 9.1 ± 0.3 b |
NH4+ (mg N kg−1 sdw) | 11.1 ± 0.8 a | 6.0 ± 0.7 b |
NO3− (mg N kg−1 sdw) | 10.9 ± 0.7 a | 6.7 ± 0.3 b |
Incubation Temperature/Moisture | SL10 | SL20 | |||
---|---|---|---|---|---|
t1 | t2 | t1 | t2 | ||
15N enrichment of NH4+ in the 15NH4+ labeled soils (atom%) | 5 °C | 2.35 ± 0.02 | 2.18 ± 0.08 | 2.90 ± 0.07 | 2.79 ± 0.02 |
15 °C | 2.13 ± 0.03 | 1.88 ± 0.004 | 2.66 ± 0.04 | 2.39 ± 0.004 | |
25 °C | 1.81 ± 0.02 | 1.31 ± 0.04 | 2.21 ± 0.02 | 1.77 ± 0.03 | |
35 °C | 1.35 ± 0.02 | 0.92 ± 0.004 | 1.70 ± 0.01 | 1.21 ± 0.01 | |
30% WHC | 1.65 ± 0.04 | 1.30 ± 01 | 2.09 ± 0.01 | 1.76 ± 0.02 | |
60% WHC | 1.59 ± 0.02 | 1.17 ± 0.02 | 2.10 ± 0.03 | 1.68 ± 0.03 | |
100% WHC | 1.60 ± 0.08 | 1.02 ± 0.04 | 2.05 ± 0.05 | 1.60 ± 0.02 | |
15N enrichment of NO3− in the 15NO3− labeled soils (atom%) | 5 °C | 2.54 ± 0.01 | 2.34 ± 0.11 | 3.91 ± 0.06 | 3.77 ± 0.11 |
15 °C | 2.41 ± 0.06 | 2.02 ± 0.06 | 3.46 ± 0.05 | 3.18 ± 0.12 | |
25 °C | 2.05 ± 0.01 | 1.76 ± 0.02 | 3.27 ± 0.03 | 2.72 ± 0.06 | |
35 °C | 1.89 ± 0.04 | 1.52 ± 0.02 | 3.02 ± 0.01 | 2.42 ± 0.03 | |
30% WHC | 2.04 ± 0.02 | 1.73 ± 0.03 | 2.09 ± 0.01 | 1.76 ± 0.02 | |
60% WHC | 1.96 ± 0.02 | 1.61 ± 0.005 | 2.10 ± 0.03 | 1.68 ± 0.03 | |
100% WHC | 1.95 ± 0.02 | 1.59 ± 0.04 | 2.05 ± 0.05 | 1.60 ± 0.02 | |
NH4+ concentrations in the 15NH4+ labeled soils (mg N kg−1 sdw) | 5 °C | 13.0 ± 0.2 | 13.6 ± 0.2 | 8.7 ± 0.04 | 8.3 ± 0.1 |
15 °C | 12.3 ± 0.2 | 10.3 ± 0.1 | 8.1 ± 0.1 | 7.8 ± 0.1 | |
25 °C | 10.0 ± 0.03 | 4.9 ± 0.1 | 7.7 ± 0.1 | 6.2 ± 0.2 | |
35 °C | 11.1 ± 0.4 | 6.3 ± 0.2 | 8.6 ± 0.2 | 7.9 ± 0.2 | |
30% WHC | 11.6 ± 0.2 | 7.8 ± 0.3 | 8.1 ± 0.1 | 6.9 ± 0.2 | |
60% WHC | 11.4 ± 0.3 | 6.2 ± 0.02 | 7.4 ± 0.1 | 6.4 ± 0.7 | |
100% WHC | 8.1 ± 0.5 | 3.8 ± 0.1 | 6.3 ± 0.3 | 5.2 ± 0.1 | |
NO3− concentrations in the 15NO3− labeled soils (mg N kg−1 sdw) | 5 °C | 12.3 ± 0.1 | 12.2 ± 0.4 | 7.2 ± 0.02 | 7.8 ± 0.1 |
15 °C | 11.0 ± 0.4 | 9.3 ± 0.1 | 7.3 ± 0.1 | 7.0 ± 0.2 | |
25 °C | 9.0 ± 0.1 | 4.0 ± 0.04 | 7.0 ± 0.1 | 5.4 ± 0.2 | |
35 °C | 10.3 ± 0.3 | 5.4 ± 0.2 | 7.7 ± 0.2 | 7.0 ± 0.3 | |
30% WHC | 10.8 ± 0.1 | 7.1 ± 0.2 | 7.5 ± 0.2 | 6.4 ± 0.3 | |
60% WHC | 9.7 ± 0.05 | 5.3 ± 0.3 | 6.7 ± 0.04 | 5.5 ± 0.2 | |
100% WHC | 7.4 ± 0.3 | 3.5 ± 0.5 | 5.8 ± 0.2 | 5.0 ± 0.2 |
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Hu, X.; Zhang, Y.; Wang, D.; Ma, J.; Xue, K.; An, Z.; Luo, W.; Sheng, Y. Effects of Temperature and Humidity on Soil Gross Nitrogen Transformation in a Typical Shrub Ecosystem in Yanshan Mountain and Hilly Region. Life 2023, 13, 643. https://doi.org/10.3390/life13030643
Hu X, Zhang Y, Wang D, Ma J, Xue K, An Z, Luo W, Sheng Y. Effects of Temperature and Humidity on Soil Gross Nitrogen Transformation in a Typical Shrub Ecosystem in Yanshan Mountain and Hilly Region. Life. 2023; 13(3):643. https://doi.org/10.3390/life13030643
Chicago/Turabian StyleHu, Xiaoxia, Yuanxun Zhang, Dong Wang, Jian Ma, Kaibing Xue, Zhaobo An, Wenxing Luo, and Yizhi Sheng. 2023. "Effects of Temperature and Humidity on Soil Gross Nitrogen Transformation in a Typical Shrub Ecosystem in Yanshan Mountain and Hilly Region" Life 13, no. 3: 643. https://doi.org/10.3390/life13030643