施肥与刈割对内蒙古草地生态化学计量特征的影响.

In order to detect the effects 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, Aneurotepidimu chinemis, and Melissitus ruthenica in the steppe were collected in August 2014. Contents of carbon, nitrogen and phosphorus, and ratios of C : N and N : P in different plants in field experiment under nitrogen fertilization and mowing treatments were investigated. The effects of nitrogen fertilization and mowing on carbon, nitrogen and phosphorus, and ratios of C : N and N : P were analyzed with ANOV As. The differences of stoichiometry characteristics under different treatments were analyzed with Post-Hoc tests. The results wer'e as follows: Neither nitrogen fertilization nor mowing allowed carbon content in the steppe. Nitrogen fertilization significantly devated 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 Melissitus ruthenica by 0.18% ( P<0.05), decreased the nitrogen content of Aneurotepidimu chinensis by 0.13% (P<0.05), but did not affect the nitrogen content of Aartemisia frigida or Potentilla tanacetifolia. Mowing significantly devaled the phosphorus contents of Artemisia frigida and Potentilla tanacetifolia ( P < 0. 05), but did not affect the phosphorus content of Melissitus ruthenica or Aneruotepidimu chinensis. The study has approved that nitrogen fertilization and mowing can affect the plant stoichiomtry characteristics in the steppe, but the affect varied with species. The results provide data support for the study on plant functional trails in the grassland. [ABSTRACT FROM AUTHOR]