Moisture effect on carbon and nitrogen mineralization in topsoil of Changbai Mountain, Northeast China
G. Qi, Q. Wang, W. Zhou, H. Ding, X. Wang, L. Qi, Y. Wang, S. Li, L. Daihttps://doi.org/10.17221/56/2010-JFSCitation:Qi G., Wang Q., Zhou W., Ding H., Wang X., Qi L., Wang Y., Li S., Dai L. (2011): Moisture effect on carbon and nitrogen mineralization in topsoil of Changbai Mountain, Northeast China. J. For. Sci., 57: 340-348.
Changbai Mountain Natural Reserve (1,985 km2 and 2,734 m a.s.l.) 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°C, annual precipitation 703.62 mm), dark coniferous forest (annual temperature –1.78°C, annual precipitation 933.67 mm), Erman's birch forest (annual temperature –2.80°C, annual precipitation 1,002.09 mm) and Alpine tundra (annual temperature –3.82°C, annual precipitation 1,075.53 mm). Studies of soil carbon (C) and nitrogen (N) mineralization have attracted wide attention in the context of global climate change. 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.Keywords:
soil moisture; soil C and N mineralization; incubation experiment; Changbai Mountain; Northeast China