Subjects: Biology >> Botany >> Applied botany submitted time 2019-08-26 Cooperative journals: 《广西植物》
Abstract： In order to detect the effect of fertilization and mowing on stoichiometry characteristics of four plant species in an semi-arid steppe in Inner-Mongolia. Four plant species including Artemisia frigida, Potentilla tanacetifolia, Leymus chinensis, and Melissitus ruthenica in the steppe were collected in August 2014. Contents of carbon, nitrogen and phosphorus, and ratios of C:N, C:P and N:P in different plants in field experiment under nitrogen fertilization and mowing treatment were investigated. The effect of nitrogen fertilization and mowing on carbon, nitrogen and phosphorus, and ratios of C:N, C:P and N:P were analyzed with ANOVAs. The differences of stoichiometry characteristics under different treatments were analyzed with Post-Hoc tests. The results indicate that neither nitrogen fertilization nor mowing alter carbon content in the steppe. Nitrogen fertilization significantly elevated the plant nitrogen content (P < 0.05), thus decreased the C:N ratio (P < 0.05) and increased the N:P ratio (P < 0.05). Mowing increased the nitrogen content of M. ruthenica by 0.18% (P < 0.05), decreased the nitrogen content of L. chinensis by 0.13% (P < 0.05), but did not affect the nitrogen content of A. frigida or P. tanacetifolia. Mowing significantly elevated the phosphorus content of Artemisia frigida and Potentilla tanacetifolia (P < 0.05), but did not affect the phosphorus content of M. ruthenica or L. chinensis. The study has approved that nitrogen fertilization and mowing can affect the plant stoichiometry characteristics in the steppe, but the affect varied with species. The results can provide data support for the study on plant functional traits in the grassland.
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