Carbon and nitrogen allocation shifts in plants and soils along aridity and fertility gradients in grasslands of China
Luo, Wentao (Zhongguo ke xue yuan. Erguna Forest-Steppe Ecotone Research Station)
Li, Mai-He (Zhongguo ke xue yuan. Erguna Forest-Steppe Ecotone Research Station)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Lü, Xiao-Tao (Zhongguo ke xue yuan. Erguna Forest-Steppe Ecotone Research Station)
Wang, Chao (Zhongguo ke xue yuan. Erguna Forest-Steppe Ecotone Research Station)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Wang, Zhengwen (Zhongguo ke xue yuan. Erguna Forest-Steppe Ecotone Research Station)
Han, Xing-Guo (Zhongguo ke xue yuan. Erguna Forest-Steppe Ecotone Research Station)
Jiang, Yong (Zhongguo ke xue yuan. Erguna Forest-Steppe Ecotone Research Station)

Data:	2017
Resum:	Plant carbon (C) and nitrogen (N) stoichiometry play an important role in the maintenance of ecosystem structure and function. To decipher the influence of changing environment on plant C and N stoichiometry at the subcontinental scale, we studied the shoot and root C and N stoichiometry in two widely distributed and dominant genera along a 2,200-km climatic gradient in China's grasslands. Relationships between C and N concentrations and soil climatic variables factors were studied. In contrast to previous theory, plant C concentration and C:N ratios in both shoots and roots increased with increasing soil fertility and decreased with increasing aridity. Relative N allocation shifted from soils to plants and from roots to shoots with increasing aridity. Changes in the C:N ratio were associated with changes in N concentration. Dynamics of plant C concentration and C:N ratios were mainly caused by biomass reallocation and a nutrient dilution effect in the plant-soil system. Our results suggest that the shifted allocation of C and N to different ecosystem compartments under a changing environment may change the overall use of these elements by the plant-soil system.
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:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Biomass allocation ; Climatic gradient ; Nutrient availability ; Plant chemistry ; Transect
Publicat a:	Ecology and evolution, Vol. 7, issue 17 (2017) , p. 6927-6934, ISSN 2045-7758

DOI: 10.1002/ece3.3245
PMID: 28904772

8 p, 1.2 MB

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