tailieunhanh - Báo cáo lâm nghiệp: "Moisture effect on carbon and nitrogen mineralization in topsoil of Changbai Mountain, Northeast China"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Moisture effect on carbon and nitrogen mineralization in topsoil of Changbai Mountain, Northeast China. | JOURNAL OF FOREST SCIENCE 57 2011 8 340-348 Moisture effect on carbon and nitrogen mineralization in topsoil of Changbai Mountain Northeast China G. Qi1 2 Q. Wang1 w. Zhou1 H. Ding1 X. Wang1 2 L. Qi1 2 Y. Wang1 2 S. Li1 2 L. Dai1 Institute of Applied Ecology Chinese Academy of Sciences Shenyang . China 2Graduate University of Chinese Academy of Sciences Beijing . China ABSTRACT Changbai Mountain Natural Reserve 1 985 km2 and 2 734 m . 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 annual precipitation mm dark coniferous forest annual temperature C annual precipitation mm Erman s birch forest annual temperature C annual precipitation 1 mm and Alpine tundra annual temperature C annual precipitation 1 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 NO -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 .