Response of Plant Community Carbon and Nitrogen Stoichiometry to Experimental Warming on the Qinghai-Tibet Plateau

Haorui ZHANG; Jiwei QIN; Gang FU

doi:10.5814/j.issn.1674-764X.2020.03.009

Journals >Journal of Resources and Ecology >Volume 11 >Issue 3 >Page 315 > Article

Journal of Resources and Ecology
Vol. 11, Issue 3, 315 (2020)

Response of Plant Community Carbon and Nitrogen Stoichiometry to Experimental Warming on the Qinghai-Tibet Plateau

Haorui ZHANG^1、3, Jiwei QIN², and Gang FU^1、*

Author Affiliations

¹Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

²Agriculture and Animal Husbandry of Tibet Autonomous Region Academy of Sciences, Institute of Agricultural Resource and Environment, Lhasa 850002, China

³University of Chinese Academy of Sciences, Beijing 100049, China

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DOI: 10.5814/j.issn.1674-764X.2020.03.009 Cite this Article

Haorui ZHANG, Jiwei QIN, Gang FU. 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 Copy Citation Text

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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. 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.

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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. 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.

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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.

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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.

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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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Observationmonth	Air temperature (℃)			Precipitation (mm)
Observationmonth	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

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		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.

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Elevation	Model	Nitrogen content		Carbon content		C/N
Elevation	Model	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.

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