Soil Nitrogen Storage, Distribution, and Associated Controlling Factors in the Northeast Tibetan Plateau Shrublands
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Field Investigation and Laboratory Measurements
2.3. Climate Data
2.4. Calculation of Soil N Storage
2.5. Statistical Analysis
3. Results
3.1. Soil N Storage and Density
3.2. Spatial and Vertical Distributions
3.3. Controlling Factors Affecting Soil N Patterns
4. Discussion
4.1. Soil N Density
4.2. Spatial and Vertical Soil N Density Distribution
4.3. Relationship between Soil N Density and MAT
4.4. Relationship between Soil N Density and MAP
4.5. Relationship between Soil N Density, MAT, and MAP
4.6. Relationship between Soil N Density and Soil pH
5. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Shrubland Type | Area (104 km2) | N Density (Kg m−2) (Meant ± Standard Deviation) | N Storage (Tg) (Mean ± Standard Deviation) | ||||
---|---|---|---|---|---|---|---|
0–30 | 0–50 | 0–100 | 0–30 | 0–50 | 0–100 | ||
Alpie shrublands | 4.29 | 1.08 ± 0.44 | 1.61 ± 0.60 | 2.40 ± 1.02 | 46.33 ± 18.88 | 69.07 ± 25.74 | 102.96 ± 43.76 |
Desert shrublands | 6.69 | 0.14 ± 0.11 | 0.24 ± 0.20 | 0.44 ± 0.37 | 9.37 ± 7.36 | 16.06 ± 13.38 | 29.44 ± 24.75 |
Overall | 10.98 | 0.51 ± 0.57. | 0.78 ± 0.81. | 1.21 ± 1.26 | 55.70 ± 65.59 | 85.13 ± 88.94 | 132.40 ± 138.35 |
Shrubland Type | a | b | n | r2 | p |
---|---|---|---|---|---|
Alpine shrublands | 0.461 | −0.017 | 41 | 0.973 | <0.001 |
Desert shrublands | 0.051 | −0.003 | 20 | 0.661 | =0.05 |
overall | 0.325 | −0.015 | 61 | 0.967 | <0.001 |
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Nie, X.; Xiong, F.; Yang, L.; Li, C.; Zhou, G. Soil Nitrogen Storage, Distribution, and Associated Controlling Factors in the Northeast Tibetan Plateau Shrublands. Forests 2017, 8, 416. https://doi.org/10.3390/f8110416
Nie X, Xiong F, Yang L, Li C, Zhou G. Soil Nitrogen Storage, Distribution, and Associated Controlling Factors in the Northeast Tibetan Plateau Shrublands. Forests. 2017; 8(11):416. https://doi.org/10.3390/f8110416
Chicago/Turabian StyleNie, Xiuqing, Feng Xiong, Lucun Yang, Changbin Li, and Guoying Zhou. 2017. "Soil Nitrogen Storage, Distribution, and Associated Controlling Factors in the Northeast Tibetan Plateau Shrublands" Forests 8, no. 11: 416. https://doi.org/10.3390/f8110416