Journal of Resources and Ecology ›› 2019, Vol. 10 ›› Issue (2): 155-162.DOI: 10.5814/j.issn.1674-764X.2019.02.006
• Grassland Ecosystem • Previous Articles Next Articles
DU Wei1, WU Shanmei1, NIE Cheng1, LI Yue1, SHAO Rui2, LIU Yinghui1,*(), SUN Nan3,*(
)
Received:
2018-10-17
Accepted:
2018-12-29
Online:
2019-03-30
Published:
2019-03-30
Contact:
LIU Yinghui,SUN Nan
Supported by:
DU Wei,WU Shanmei,NIE Cheng,LI Yue,SHAO Rui,LIU Yinghui,SUN Nan. Soil Respiration Dynamics and Influencing Factors in Typical Steppe of Inner Mongolia under Long-term Nitrogen Addition[J]. Journal of Resources and Ecology, 2019, 10(2): 155-162.
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URL: http://www.jorae.cn/EN/10.5814/j.issn.1674-764X.2019.02.006
Fig. 4 Seasonal dynamic curve of soil respiration rate (mean ± SE)Note: * indicates a significant difference between at least two nitrogen addition treatments during the month.
Fig. 5 Dynamic soil respiration rate during the growing and non- growing seasons under different N addition levels (mean ± SE)Note: Different uppercase letters indicate significant differences in different nitrogen addition treatments during the growing season and lowercase letters for the non-growing season.
N addition (g m-2 yr-1) | Rs and soil temperature | Rs and soil moisture | |||||
---|---|---|---|---|---|---|---|
Formula | R2 | P | Q10 | Formula | R2 | P | |
0 | Rs = 0.2245e0.1417T | 0.97 | <0.01 | 4.13 | Rs = 0.014M1.646 | 0.76 | <0.01 |
2 | Rs = 0.3851e0.0945 T | 0.75 | <0.05 | 2.57 | Rs = 0.017M1.499 | 0.80 | <0.01 |
4 | Rs = 0.2385e0.1250 T | 0.96 | <0.01 | 3.49 | Rs = 0.013M1.600 | 0.75 | <0.01 |
8 | Rs = 0.1736e0.1425 T | 0.95 | <0.01 | 4.16 | Rs = 0.015M1.535 | 0.75 | <0.01 |
16 | Rs = 0.4146e0.0819 T | 0.72 | <0.05 | 2.27 | Rs = 0.013M1.560 | 0.82 | <0.01 |
32 | Rs = 0.3644e0.0927 T | 0.77 | <0.05 | 2.53 | Rs = 0.014M1.530 | 0.74 | <0.01 |
Table 1 Function fitting of soil respiration (Rs) and soil temperature and moisture
N addition (g m-2 yr-1) | Rs and soil temperature | Rs and soil moisture | |||||
---|---|---|---|---|---|---|---|
Formula | R2 | P | Q10 | Formula | R2 | P | |
0 | Rs = 0.2245e0.1417T | 0.97 | <0.01 | 4.13 | Rs = 0.014M1.646 | 0.76 | <0.01 |
2 | Rs = 0.3851e0.0945 T | 0.75 | <0.05 | 2.57 | Rs = 0.017M1.499 | 0.80 | <0.01 |
4 | Rs = 0.2385e0.1250 T | 0.96 | <0.01 | 3.49 | Rs = 0.013M1.600 | 0.75 | <0.01 |
8 | Rs = 0.1736e0.1425 T | 0.95 | <0.01 | 4.16 | Rs = 0.015M1.535 | 0.75 | <0.01 |
16 | Rs = 0.4146e0.0819 T | 0.72 | <0.05 | 2.27 | Rs = 0.013M1.560 | 0.82 | <0.01 |
32 | Rs = 0.3644e0.0927 T | 0.77 | <0.05 | 2.53 | Rs = 0.014M1.530 | 0.74 | <0.01 |
DOC | MBC | NH4+-N | NO3--N | TON | pH | |
---|---|---|---|---|---|---|
Rs (August 2016) | -0.079 | 0.604** | -0.582* | -0.483* | 0.088 | 0.615** |
Rs (December 2016) | 0.378 | -0.076 | 0.390 | 0.149 | -0.226 | -0.154 |
Table 2 Pearson correlation between soil nutrients and soil respiration (Rs)
DOC | MBC | NH4+-N | NO3--N | TON | pH | |
---|---|---|---|---|---|---|
Rs (August 2016) | -0.079 | 0.604** | -0.582* | -0.483* | 0.088 | 0.615** |
Rs (December 2016) | 0.378 | -0.076 | 0.390 | 0.149 | -0.226 | -0.154 |
N addition (August 2016) | N addition (December 2016) | |
---|---|---|
DOC | 0.207 | 0.613** |
MBC | -0.676** | -0.841*** |
NH4+-N | 0.700** | 0.753*** |
NO3--N | 0.743*** | 0.656** |
TON | -0.011 | -0.335 |
pH | -0.962*** | -0.951*** |
Table 3 Pearson correlation between nitrogen (N) addition and soil nutrients
N addition (August 2016) | N addition (December 2016) | |
---|---|---|
DOC | 0.207 | 0.613** |
MBC | -0.676** | -0.841*** |
NH4+-N | 0.700** | 0.753*** |
NO3--N | 0.743*** | 0.656** |
TON | -0.011 | -0.335 |
pH | -0.962*** | -0.951*** |
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