期刊
ENVIRONMENTAL POLLUTION
卷 158, 期 6, 页码 2273-2281出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2010.02.005
关键词
Elevated N deposition; Bryophyte; Carbon isotopic discrimination; Photosynthesis; City ecosystem
资金
- National Natural Science Foundation of China [40903012, 40721002]
- Ministry of Science and Technology of China [200603403200]
Epilithic mosses are characterized by insulation from substratum N and hence meet their N demand only by deposited N. This study investigated tissue C, total Chl and delta C-13 of epilithic mosses along 2 transects across Guiyang urban (SW China), aiming at testing their responses to N deposition. Tissue C and total Chl decreased from the urban to rural, but delta C-13(moss) became less negative. With measurements of atmospheric CO2 and delta(CO2)-C-13, elevated N deposition was inferred as a primary factor for changes in moss C and isotopic signatures. Correlations between total Chl, tissue C and N signals indicated a nutritional effect on C fixation of epilithic mosses, but the response of delta C-13(moss) to N deposition could not be clearly differentiated from effects of other factors. Collective evidences suggest that C signals of epilithic mosses are useful proxies for N deposition but further works on physiological mechanisms are still needed. (C) 2010 Elsevier Ltd. All rights reserved.
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