Moisture effect on carbon and nitrogen mineralization in topsoil of Changbai Mountain, Northeast China
Qi, G.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology | Wang, Q.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology | Zhou, W.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology | Ding, H.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology | Wang, X.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology | Qi, L.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology | Wang, Y.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology | Li, S.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology | Dai, L.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology
Changbai Mountain Natural Reserve of Northeast China is a typical ecosystem representing the temperate biosphere. The vegetation is vertically divided into 4 dominant zones: broadleaved Korean pine forest (annual temperature 2.32 deg C, annual precipitation 703.62 mm), dark coniferous forest (annual temperature -1.78 deg C, annual precipitation 933.67 mm), Erman's birch forest (annual temperature -2.80 deg C, annual precipitation 1,002.09 mm) and Alpine tundra (annual temperature -3.82 deg C, annual precipitation 1,075.53 mm). Based on the data of a 42-day laboratory incubation experiment, this paper investigated the relationship between soil moisture and mineralization of C and N in soils with different vegetation types on the northern slope of the Natural Reserve Zone of Changbai Mountain. The elevation influence on soil C and N mineralization was also discussed. The results indicated that for the given vegetation type of Changbai Mountain the C and N mineralization rate, potential mineralizable C (C0) and potential rate of initial C mineralization (C0k) all increased as the soil moisture rose. The elevation or vegetation type partially affected the soil C and N mineralization but without a clear pattern. The moisture-elevation interaction significantly affected soil C and NO3--N mineralization, but the effect on NH4+-N mineralization was not significant. The complex mechanism of their impact on the soil C and N mineralization of Changbai Mountain remains to be studied further based on data of field measurements in the future.
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