Journal of Resources and Ecology ›› 2020, Vol. 11 ›› Issue (3): 315-321.DOI: 10.5814/j.issn.1674-764X.2020.03.009
• Ecosystem Responses to Climate Change • Previous Articles Next Articles
ZHANG Haorui1,3, QIN Jiwei2, FU Gang1,*()
Received:
2019-11-26
Accepted:
2020-02-17
Online:
2020-05-30
Published:
2020-06-16
Contact:
FU Gang
About author:
ZHANG Haorui, E-mail: zhanghr.18s@igsnrr.ac.cn
Supported by:
ZHANG Haorui, QIN Jiwei, FU Gang. Response of Plant Community Carbon and Nitrogen Stoichiometry to Experimental Warming on the Qinghai-Tibet Plateau[J]. Journal of Resources and Ecology, 2020, 11(3): 315-321.
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URL: http://www.jorae.cn/EN/10.5814/j.issn.1674-764X.2020.03.009
Observation month | Air temperature (℃) | Precipitation (mm) | ||||
---|---|---|---|---|---|---|
4300 m | 4500 m | 4700 m | 4300 m | 4500 m | 4700 m | |
2011-08 | 11.41 | 10.11 | 9.01 | 56.81 | 57.52 | 58.18 |
2011-09 | 10.49 | 9.29 | 8.29 | 58.14 | 59.95 | 61.04 |
2012-08 | 12.02 | 10.80 | 9.76 | 80.53 | 83.40 | 85.91 |
Table 1 Monthly temperature and precipitation in Damxung County
Observation month | Air temperature (℃) | Precipitation (mm) | ||||
---|---|---|---|---|---|---|
4300 m | 4500 m | 4700 m | 4300 m | 4500 m | 4700 m | |
2011-08 | 11.41 | 10.11 | 9.01 | 56.81 | 57.52 | 58.18 |
2011-09 | 10.49 | 9.29 | 8.29 | 58.14 | 59.95 | 61.04 |
2012-08 | 12.02 | 10.80 | 9.76 | 80.53 | 83.40 | 85.91 |
Nitrogen content | Carbon content | C/N | |||||
---|---|---|---|---|---|---|---|
F | P | F | P | F | P | ||
4300 m | Warming(W) | 0.96 | 0.382 | 3.41 | 0.139 | 3.84 | 0.122 |
Month(M) | 13.44 | 0.003 | 4.09 | 0.060 | 18.93 | 0.001 | |
W×M | 0.78 | 0.492 | 0.25 | 0.788 | 0.40 | 0.682 | |
4500 m | Warming(W) | 0.47 | 0.532 | 0.01 | 0.948 | 1.25 | 0.327 |
Month(M) | 40.52 | 0.000 | 4.50 | 0.049 | 63.79 | 0.000 | |
W×M | 2.34 | 0.159 | 1.26 | 0.336 | 7.71 | 0.014 | |
4700 m | Warming(W) | 0.34 | 0.593 | 0.02 | 0.906 | 1.61 | 0.273 |
Month(M) | 53.72 | 0.000 | 18.31 | 0.001 | 103.77 | 0.000 | |
W×M | 5.17 | 0.036 | 0.23 | 0.800 | 6.29 | 0.023 |
Table 2 Analysis of repeated measures of variance for the effects of experimental warming and the observation month were taken on carbon content, nitrogen content and the ratio of carbon to nitrogen for the above-ground parts of plant communities.
Nitrogen content | Carbon content | C/N | |||||
---|---|---|---|---|---|---|---|
F | P | F | P | F | P | ||
4300 m | Warming(W) | 0.96 | 0.382 | 3.41 | 0.139 | 3.84 | 0.122 |
Month(M) | 13.44 | 0.003 | 4.09 | 0.060 | 18.93 | 0.001 | |
W×M | 0.78 | 0.492 | 0.25 | 0.788 | 0.40 | 0.682 | |
4500 m | Warming(W) | 0.47 | 0.532 | 0.01 | 0.948 | 1.25 | 0.327 |
Month(M) | 40.52 | 0.000 | 4.50 | 0.049 | 63.79 | 0.000 | |
W×M | 2.34 | 0.159 | 1.26 | 0.336 | 7.71 | 0.014 | |
4700 m | Warming(W) | 0.34 | 0.593 | 0.02 | 0.906 | 1.61 | 0.273 |
Month(M) | 53.72 | 0.000 | 18.31 | 0.001 | 103.77 | 0.000 | |
W×M | 5.17 | 0.036 | 0.23 | 0.800 | 6.29 | 0.023 |
Fig. 1 Effects of experimental warming on the carbon content, nitrogen content and the ratio of carbon to nitrogen for the above-ground parts of plant communities in alpine meadows at elevations 4300 m, 4500 m and 4700 m in August 2011 (a, b, c), September 2011 (d, e, f) and August 2012 (g, h, i) Note: Values with “*” show significant differences in the carbon and nitrogen content after experimental warming at the 0.05 level.
Fig. 2 Effects of experimental warming on the carbon content, nitrogen content and the ratio of carbon to nitrogen for the below-ground parts of plant communities in alpine meadows at elevations 4300 m, 4500 m and 4700 m in August 2011 (a, b, c), September 2011 (d, e, f) and August 2012 (g, h, i) Note: Values with “*” “**” show significant differences in the carbon and nitrogen content after experimental warming at the 0.05 level and 0.01 level, respectively.
Fig. 3 Effects of experimental warming on soil NH4+-N and NO3--N in alpine meadows at elevations 4300 m, 4500 m and 4700 m in August 2011 (a, b), September 2011 (c, d) and August 2012 (e, f) Note: Values with “*” show significant differences in the NH4+-N and NO3--N content after experimental warming at the 0.05 level.
Elevation | Model | Nitrogen content | Carbon content | C/N | |||
---|---|---|---|---|---|---|---|
F | P | F | P | F | P | ||
4300 m | Warming | 7.62 | 0.051 | 1.469 | 0.292 | 4.936 | 0.090 |
Month | 4.00 | 0.115 | 14.69 | 0.002 | 14.63 | 0.002 | |
Interaction | 0.06 | 0.814 | 0.08 | 0.923 | 0.02 | 0.981 | |
4500 m | Warming | 1.10 | 0.354 | 2.24 | 0.209 | 6.05 | 0.070 |
Month | 0.22 | 0.808 | 28.87 | 0.000 | 11.76 | 0.004 | |
Interaction | 1.99 | 0.199 | 3.16 | 0.097 | 2.57 | 0.137 | |
4700 m | Warming | 2.10 | 0.221 | 13.80 | 0.021 | 3.40 | 0.139 |
Month | 7.00 | 0.017 | 7.34 | 0.016 | 9.56 | 0.008 | |
Interaction | 4.42 | 0.051 | 4.54 | 0.048 | 7.74 | 0.013 |
Table 3 Analysis of repeated measures of variance for the effects of experimental warming and the observation month were taken on carbon content, nitrogen content and the ratio of carbon to nitrogen for the belowground parts of plant communities
Elevation | Model | Nitrogen content | Carbon content | C/N | |||
---|---|---|---|---|---|---|---|
F | P | F | P | F | P | ||
4300 m | Warming | 7.62 | 0.051 | 1.469 | 0.292 | 4.936 | 0.090 |
Month | 4.00 | 0.115 | 14.69 | 0.002 | 14.63 | 0.002 | |
Interaction | 0.06 | 0.814 | 0.08 | 0.923 | 0.02 | 0.981 | |
4500 m | Warming | 1.10 | 0.354 | 2.24 | 0.209 | 6.05 | 0.070 |
Month | 0.22 | 0.808 | 28.87 | 0.000 | 11.76 | 0.004 | |
Interaction | 1.99 | 0.199 | 3.16 | 0.097 | 2.57 | 0.137 | |
4700 m | Warming | 2.10 | 0.221 | 13.80 | 0.021 | 3.40 | 0.139 |
Month | 7.00 | 0.017 | 7.34 | 0.016 | 9.56 | 0.008 | |
Interaction | 4.42 | 0.051 | 4.54 | 0.048 | 7.74 | 0.013 |
Fig. 4 Variation partitioning analyses (VPA) of the carbon content, nitrogen content and the ratio of carbon to nitrogen of plant communities in alpine meadows.
Fig. 5 Regression analyses of the carbon content, nitrogen content and the ratio of carbon to nitrogen of plant communities with NH4+-N and NO3--N in the soil
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