Contrasting effects of nitrogen and phosphorus addition on soil respiration in an alpine grassland on the Qinghai-Tibetan Plateau

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	Contrasting effects of nitrogen and phosphorus addition on soil respiration in an alpine grassland on the Qinghai-Tibetan Plateau
	Ren, Fei ; Yang, Xiaoxia ; Zhou, Huakun ; Zhu, Wenyan ; Zhang, Zhenhua ; Chen, Litong ; Cao, Guangmin ; He, Jin-Sheng
	2016-10-10
发表期刊	SCIENTIFIC REPORTS
摘要	High soil organic carbon content, extensive root biomass, and low nutrient availability make alpine grasslands an important ecosystem for assessing the influence of nutrient enrichment on soil respiration (SR). We conducted a four-year (2009-2012) field experiment in an alpine grassland on the Qinghai-Tibetan Plateau to examine the individual and combined effects of nitrogen (N, 100 kg ha(-1)year(-1)) and phosphorus (P, 50 kg ha(-1)year(-1)) addition on SR. We found that both N and P addition did not affect the overall growing-season SR but effects varied by year: with N addition SR increased in the first year but decreased during the last two years. However, while P addition did not affect SR during the first two years, SR increased during the last two years. No interactive effects of N and P addition were observed, and both N addition and P addition reduced heterotrophic respiration during the last year of the experiment. N and P addition affected SR via different processes: N mainly affected heterotrophic respiration, whereas P largely influenced autotrophic respiration. Our results highlight the divergent effects of N and P addition on SR and address the important potential of P enrichment for regulating SR and the carbon balance in alpine grasslands.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/48125
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Ren, Fei,Yang, Xiaoxia,Zhou, Huakun,et al. Contrasting effects of nitrogen and phosphorus addition on soil respiration in an alpine grassland on the Qinghai-Tibetan Plateau[J]. SCIENTIFIC REPORTS,2016.
APA	Ren, Fei.,Yang, Xiaoxia.,Zhou, Huakun.,Zhu, Wenyan.,Zhang, Zhenhua.,...&He, Jin-Sheng.(2016).Contrasting effects of nitrogen and phosphorus addition on soil respiration in an alpine grassland on the Qinghai-Tibetan Plateau.SCIENTIFIC REPORTS.
MLA	Ren, Fei,et al."Contrasting effects of nitrogen and phosphorus addition on soil respiration in an alpine grassland on the Qinghai-Tibetan Plateau".SCIENTIFIC REPORTS (2016).