Effects of elevated nitrogen deposition on soil microbial biomass carbon in major subtropical forests of southern China |
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Authors: | Hui Wang Jiangming Mo Xiankai Lu Jinghua Xue Jiong Li Yunting Fang |
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Institution: | (1) Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Key Laboratory of Forest Ecology and Environment, State Forestry Administration, Beijing, 100091, China;(2) Dinghushan Forest Ecosystem Research Station, South China Botanical Garden, the Chinese Academy of Sciences, Zhaoqing, 526070, China |
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Abstract: | The effects of elevated nitrogen deposition on soil microbial biomass carbon (C) and extractable dissolved organic carbon
(DOC) in three types of forest of southern China were studied in November, 2004 and June, 2006. Plots were established in
a pine forest (PF), a mixed pine and broad-leaved forest (MF) and monsoon evergreen broad-leaved forest (MEBF) in the Dinghushan
Nature Reserve. Nitrogen treatments included a control (no N addition), low N (50 kg N/(hm2·a)), medium N (100 kg N/(hm2·a)) and high N (150 kg N/(hm2·a)). Microbial biomass C and extractable DOC were determined using a chloroform fumigation-extraction method. Results indicate
that microbial biomass C and extractable DOC were higher in June, 2006 than in November, 2004 and higher in the MEBF than
in the PF or the MF. The response of soil microbial biomass C and extractable DOC to nitrogen deposition varied depending
on the forest type and the level of nitrogen treatment. In the PF or MF forests, no significantly different effects of nitrogen
addition were found on soil microbial biomass C and extractable DOC. In the MEBF, however, the soil microbial biomass C generally
decreased with increased nitrogen levels and high nitrogen addition significantly reduced soil microbial biomass C. The response
of soil extractable DOC to added nitrogen in the MEBF shows the opposite trend to soil microbial biomass C. These results
suggest that nitrogen deposition may increase the accumulation of soil organic carbon in the MEBF in the study region.
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Translated from Acta Ecologica Sinica, 2008, 28(2): 470–478 译自: 生态学报] |
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Keywords: | nitrogen deposition microbial biomass extractable dissolved orgamic carbon (DOC) subtropical forest |
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