| Autor: |
Luo, Wentao, Li, Mai ‐ He, Sardans, Jordi, Lü, Xiao ‐ Tao, Wang, Chao, Peñuelas, Josep, Wang, Zhengwen, Han, Xing ‐ Guo, Jiang, Yong |
| Předmět: |
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| Zdroj: |
Ecology & Evolution (20457758); Sep2017, Vol. 7 Issue 17, p6927-6934, 8p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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