Dissolved organic carbon and nitrogen in precipitation, throughfall and stemflow fromSchima superba andCunninghamia lanceolata plantations in subtropical China |
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| Authors: | Guo Jian-fen Yang Yu-sheng Chen Guang-shui Lin Peng |
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| Institution: | (1) College of Life Science, Xiamen University, 361005 Xiamen, P.R. China;(2) College of Geography Science, Fujian Normal University, 350007 Fuzhou, P.R. China |
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| Abstract: | Despite growing attention to the role of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) in forest nutrient
cycling, their monthly concentration dynamics in forest ecosystems, especially in subtropical forests only were little known.
The goal of this study is to measure the concentrations and monthly dynamics of DOC and DON in precipitation, throughfall
and stemflow for two plantations ofSchima superba (SS) and Chinese fir (Cunninghamia lanceolata, CF) in Jianou, Fujian, China. Samples of precipitation, throughfall and stemflow were collected on a rain event base from
January 2002 to December 2002. Upon collection, all water samples were analyzed for DOC, NO3
−−N, NH4
+−N and total dissolved N (TDN). DON was calculated by subtracting NO3
−−N and NH4
+−N from TDN. The results showed that the precipitation had a mean DOC concentration of 1.7 mg·L−1 and DON concentration of 0.13 mg·L−1. The mean DOC and DON concentrations in throughfall were 11.2 and 0.24 mg·L−1 in the SS and 10.3 and 0.19 mg·L−1 in the CF respectively. Stemflow DOC and DON concentrations in the CF (19.1 and 0.66 mg·L−1 respectively) were significantly higher than those in the SS (17.6 and 0.48 mg·L−1 respectively). No clear monthly variation in precipitation DOC concentration was found in our study, while DON concentration
in precipitation tended to be higher in summer or autumn. The monthly variations of DON concentrations were very similar in
throughfall and stemflow at both forests, showing an increase at the beginning of the rainy season in March. In contrast,
monthly changes of the DOC concentrations in throughfall of the SS and CF were different to those in stemflow. Throughfall
DOC concentrations were higher from February to April, while relatively higher DOC concentrations in stemflow were found during
September–November period.
Foundation item: This study was supported by the Teaching and Research Award program for MOE P.R.C. (TRAPOYT).
Biography: Guo Jian-fen (1977-), female, Ph. Doctor in College of Life Science, Xiamen University, Xiamen 361005, P.R. China.
Responsible editor: Zhu Hong |
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| Keywords: | Dissolved organic carbon (DOC) Dissolved organic nitrogen (DON) Precipitation Throughfall Stemflow Schima superba Cunninghamia lanceolata Plantation |
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