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Liu Weiqiu,Liu Binyang,Lei Chunyi,Zhang Yishun,Guo Wei.Physiological responses of Pogonatum cirratum subsp. fuscatum living in different habitats to simulated nitrogen deposition[J].stxben,2011,31(6):291~297
DOI:10.1016/j.chnaes.2011.07.007
Physiological responses of Pogonatum cirratum subsp. fuscatum living in different habitats to simulated nitrogen deposition
Liu Weiqiu1,,,Liu Binyang1,Lei Chunyi2,Zhang Yishun1,Guo Wei1
1.State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
2.Heishiding Nature Reserve, Zhaoqing 526536, China
Abstract
      The effects of nitrogen (N) deposition on Pogonatum cirratum (Sw.) Bird. subsp. fuscatum (Mitt.) Hyvoenen, a species of moss widely distributed in South China, were investigated. Plots subjected to a gradient of N treatments were established in 3 habitats with different illumination and humidity conditions. N was sprayed onto plots with NH4NO3 solutions, at doses equivalent to 20, 40 and 60 kg N ha-1, in 4 applications during May 2006 and January 2007. The results suggest that high N deposition affects both carbon (C) and N metabolism of P. cirratum subsp. fuscatum, as well as the interaction between them. On the other hand, the sensitivity of the moss varied according to the humidity and light conditions. Moss in a habitat with high humidity and moderate light was more tolerant to an N deposition increase than moss in a habitat with low humidity and low light, as the latter was extremely sensitive to an increase in N deposition.
Key Words:Nitrogen deposition  Pogonatum cirratum subsp. fuscatum  Physiological response  Environmental factor
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