Journal of Resources and Ecology ›› 2019, Vol. 10 ›› Issue (2): 147-154.DOI: 10.5814/j.issn.1674-764X.2019.02.005
• Grassland Ecosystem • Previous Articles Next Articles
LI Yue1, NIE Cheng1, SHAO Rui2, DU Wei1, LIU Yinghui1,*
Received:
2018-10-17
Accepted:
2018-12-20
Online:
2019-03-30
Published:
2019-03-30
Contact:
LIU Yinghui
Supported by:
LI Yue,NIE Cheng,SHAO Rui,DU Wei,LIU Yinghui. Soil Priming Effect Mediated by Nitrogen Fertilization Gradients in a Semi-arid Grassland, China[J]. Journal of Resources and Ecology, 2019, 10(2): 147-154.
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URL: http://www.jorae.cn/EN/10.5814/j.issn.1674-764X.2019.02.005
Source of variation | Soil CO2 | Total PLFA | Bacteria | Fungi | F:B ratio |
---|---|---|---|---|---|
Day | 1.13 | 44.53*** | 40.16*** | 28.55*** | 0.41 |
Nitrogen | 8.21** | 23.43*** | 0.73 | 22.24*** | 19.77*** |
Glucose | 134.83*** | 142.39*** | 0.01 | 8.57** | 6.58* |
Day × Nitrogen | 1.66 | 1.17 | 7.87*** | 2.94** | 0.85 |
Day × Glucose | 20.01*** | 19.16*** | 63.38*** | 15.93*** | 14.19*** |
Nitrogen × Glucose | 1.90 | 2.01 | 1.58 | 0.01 | 0.02 |
Day × Nitrogen ×Glucose | 1.94 | 1.86 | 7.00*** | 2.37 | 0.38 |
Table 1 Repeated-measures ANOVA for soil CO2, total PLFA, bacteria, fungi and the F:B ratio among treatments in four sampling days.
Source of variation | Soil CO2 | Total PLFA | Bacteria | Fungi | F:B ratio |
---|---|---|---|---|---|
Day | 1.13 | 44.53*** | 40.16*** | 28.55*** | 0.41 |
Nitrogen | 8.21** | 23.43*** | 0.73 | 22.24*** | 19.77*** |
Glucose | 134.83*** | 142.39*** | 0.01 | 8.57** | 6.58* |
Day × Nitrogen | 1.66 | 1.17 | 7.87*** | 2.94** | 0.85 |
Day × Glucose | 20.01*** | 19.16*** | 63.38*** | 15.93*** | 14.19*** |
Nitrogen × Glucose | 1.90 | 2.01 | 1.58 | 0.01 | 0.02 |
Day × Nitrogen ×Glucose | 1.94 | 1.86 | 7.00*** | 2.37 | 0.38 |
Fig. 1 Dynamics of soil CO2 among treatments in four sampling daysNote: N0, N4 and N16 represent nitrogen levels of 0, 4 and 16 g N m-2 yr-1, respectively.
Fig. 2 Soil CO2 in the control treatment and soil CO2 and soil organic matter derived CO2 in the 13C labeled glucose treatment on day 3(a), 7(b), 21(c), and 35(d).Note: A one-way ANOVA is conducted for all CO2 concentrations in the control treatment and SOM-derived CO2 among nitrogen levels in each sampling day. Different lowercase letters indicate significant difference in CO2 at P < 0.05.
Treatment | Variable | Coefficient |
---|---|---|
Control | Total PLFA | -0.621* |
Bacteria | -0.443 | |
Fungi | -0.857** | |
F:B ratio | -0.828** | |
Glucose | Total PLFA | -0.680* |
Bacteria | 0.266 | |
Fungi | -0.710** | |
F:B ratio | -0.917** |
Table 2 Spearman correlations between N levels and total PLFA, bacteria, fungi and the F:B ratio averaged by sampling days.
Treatment | Variable | Coefficient |
---|---|---|
Control | Total PLFA | -0.621* |
Bacteria | -0.443 | |
Fungi | -0.857** | |
F:B ratio | -0.828** | |
Glucose | Total PLFA | -0.680* |
Bacteria | 0.266 | |
Fungi | -0.710** | |
F:B ratio | -0.917** |
Fig. 4 Mean PLFA biomass on day 3 and 7 (a) and non-metric multidimensional scaling ordination of PLFA biomarkers (b) among treatments on day 3 and 7Note: A one-way ANOVA is conducted for PLFA among treatments. Different lowercase letters indicate significant difference in PLFA at P < 0.05
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