Effects of extreme drought on plant nutrient uptake and resorption in rhizomatous vs bunch grass dominated grasslands
Luo, Wentao (Chinese Academy of Sciences. Institute of Applied Ecology)
Xu, Chong (Chinese Academy of Agricultural Sciences. Institute of Agricultural Resources and Regional Planning)
Ma, Wang (Chinese Academy of Sciences. Institute of Applied Ecology)
Xiaosa, Yue (Chinese Academy of Sciences. Northwest Institute of Eco-Environment and Resources)
Xiaoan, Liang (Chinese Academy of Sciences. Institute of Applied Ecology)
Zuo, Xiaoan (Chinese Academy of Sciences. Northwest Institute of Eco-Environment and Resources)
Knapp, Alan K. (Colorado State University. Department of Biology)
Smith, Melinda D. (Colorado State University. Department of Biology)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Dijkstra, Feike A. (The University of Sydney. Sydney Institute of Agriculture)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Bai, Yongfei (Chinese Academy of Sciences. Institute of Botany)
Wang, Zhengwen (Chinese Academy of Sciences. Institute of Applied Ecology)
Yu, Qiang (Chinese Academy of Agricultural Sciences. Institute of Agricultural Resources and Regional Planning)
Han, Xingguo (Chinese Academy of Sciences. Institute of Applied Ecology)

Data:	2018
Resum:	Both the dominance and the mass ratio hypotheses predict that plant internal nutrient cycling in ecosystems is determined by the dominant species within plant communities. We tested this hypothesis under conditions of extreme drought by assessing plant nutrient (N, P and K) uptake and resorption in response to experimentally imposed precipitation reductions in two semiarid grasslands of northern China. These two communities shared similar environmental conditions, but had different dominant species-one was dominated by a rhizomatous grass (Leymus chinensis) and the other by a bunchgrass (Stipa grandis). Results showed that responses of N to drought differed between the two communities with drought decreasing green leaf N concentration and resorption in the community dominated by the rhizomatous grass, but not in the bunchgrass-dominated community. In contrast, negative effects of drought on green leaf P and K concentrations and their resorption efficiencies were consistent across the two communities. Additionally, in each community, the effects of extreme drought on soil N, P and K supply did not change synchronously with that on green leaf N, P and K concentrations, and senesced leaf N, P and K concentrations showed no response to extreme drought. Consistent with the dominance/mass ratio hypothesis, our findings suggest that differences in dominant species and their growth form (i. e. , rhizomatous vs bunch grass) play an important nutrient-specific role in mediating plant internal nutrient cycling across communities within a single region.
Ajuts:	European Commission 610028 Ministerio de Economía y Competitividad CGL2013-48074-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-274
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Dominance/mass ratio hypothesis ; Dominant species ; Extreme drought ; Nutrient cycling
Publicat a:	Oecologia, Vol. 188, issue 2 (Oct. 2018) , p. 633-643, ISSN 1432-1939

DOI: 10.1007/s00442-018-4232-1

Postprint 36 p, 586.4 KB

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