天山高寒草原植物叶片氮磷化学计量特征对氮沉降的响应

doi:10.13866/j.azr.2019.02.19

Abstract

Abstract: Atmospheric nitrogen (N) deposition is rapidly increased due to the increase of human activities and climate change,which enhances the N availability and affects the nutrient cycling of plants in alpine grasslands.However,there is still much debate about how the change of nutrient availability affects P content in plants,therefore,the effects of N addition on N and P contents and N∶P stoichiometry in mature and senesced leaves at plant organ level in the Bayinbuluk alpine grasslands in the northwest Tianshanin Mountains in China were examined based on a 10-year field experiment.The nitrogen and phosphorus contents in mature and senesced leaves of Potentilla bifurca,Leymus tianschanicus and Koeleria cristata were measured,and the values of foliar stoichiometry under N addition treatments at levels of 0,3,9 g·m^-2·a^-1) were estimated.Results showed that there were the significant differences of the values of nutrient concentration and foliar stoichiometry between the mature and senesced leaves.The N contents in mature and senesced leaves were 12.78 mg·g^-1 and 6.88 mg·g^-1,and the P contents were 0.88 mg·g^-1 and 0.46 mg·g^-1,respectively.N and P concentrations in mature and senesced leaves were in an order of P.bifurca>L.tiansecalinus >K.cristata.After the N treatments for 10 years,the N contents in mature and senesced leaves were increased by 12% and 48% respectively.It was found that there was a divergent response of P content in leaves,the effect of N addition on foliar P content was different from different plant species,and the P content in senesced leaves was decreased by N addition.N∶P in senesced leaves was increased significantly but not in mature leaves.In addition,the correlations between N and P elements and plant stoichiometry in mature and senesced leaves were different.There was a positive correlation between foliar N and P contents of P.bifurca in mature leaves (P<0.05),but a negative correlation in senesced leaves.Our finds revealed that nitrogen addition affected significantly the nutrient content and stoichiometry in leaves of the three species,but there was a significant difference among species.The increase of N deposition would affect the nutrient cycling of plants in grasslands in the Tianshan Mountains.

Key words: plant leaves, nitrogen content, phosphorus content, stoichiometric, nitrogen deposition, alpine grasslands, Bayinbuluk

SU Yuan, LUO Yan, GENG Feng-zhan, HAN Wen-xuan, ZHU Yu-mei, LI Kai-hui, LIU Xue-jun. Response of Stoichiometric Characteristics of Nitrogen and Phosphorus in Plant Leaves in an Alpine Grasslands to Nitrogen Deposition in the Tianshan Mountains[J].Arid Zone Research, 2019, 36(2): 430-436.

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Response of Stoichiometric Characteristics of Nitrogen and Phosphorus in Plant Leaves in an Alpine Grasslands to Nitrogen Deposition in the Tianshan Mountains

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