文献类型：期刊文献

英文题名：Research on soil net nitrogen mineralization in Stipa grandis grassland with different stages of degradation

作者：Wen, Wanyu[1,2,3] Li, Xiaobing[2,4] Chen, Lihong[5] Wei, Dandan[2] Wang, Han[2] Zhang, Meng[2] Yu, Jing[2]

第一作者：Wen, Wanyu;文菀玉

通信作者：Li, XB[1];Li, XB[2]

机构：[1]Chinese Acad Forestry, Inst Wetland Res, Beijing 100091, Peoples R China;[2]Beijing Normal Univ, Coll Resources Sci & Technol, Beijing 100875, Peoples R China;[3]Beijing Key Lab Wetland Serv & Restorat, Beijing 100091, Peoples R China;[4]Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China;[5]Jiangsu Normal Univ, Sch Geodesy & Geomat, Xuzhou 221116, Peoples R China

年份：2016

卷号：20

期号：4

起止页码：485-494

外文期刊名：GEOSCIENCES JOURNAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000380724000005)】；

基金：This research was jointly funded by the National Key Basic Research Program of China (2014CB138803), the Natural Science Foundation of China (31570451), Programme for Changjiang Scholars and Innovative Research Team in University (IRT1108), and the project was also supported by Forestry Industry Research Special Funds for Public Welfare Projects (201500419).

语种：英文

外文关键词：ammonification; nitrification; mineral nitrogen; degradation grassland; Stipa grandis grassland

摘要：Net nitrogen mineralization is one of the nitrogen cycling process, and it is very important to understand nitrogen mineralization characteristics in degradation grassland. In the upper 0-10 cm soil layer of Stipa grandis P. A. Smirn. grassland in the Xilin river basin, Inner Mongolia, we studied the soil net nitrogen mineralization and nitrification among three varying stages of degradation grassland and analyzed the relationship between the mineralization rate of the soil net nitrogen and environmental factors, using the resin-core incubation method. Our results demonstrated that, from May to October 2012, the accumulated net nitrogen mineralization was 21.620 mg kg(-1), 12.486 mg kg(-1), and 48.053 mg kg(-1) in the slightly, medium, and heavily degraded grasslands, respectively and varied greatly among the three stages of degradation shown by the S. grandis grassland plots. During the cultivation period, the variation of net nitrogen mineralization and nitrification was similar to the variation of soil mineral nitrogen. The higher soil mineral nitrogen content indicated higher mineralization of net nitrogen. In July and August, soil moisture was positively correlated with the net nitrogen mineralization rate, and the correlation coefficients between these two factors of 0.73, 0.58, and 0.79 for the slightly, medium, and heavily degraded plots, respectively. The rates of net nitrogen mineralization and nitrification were negatively correlated with soil total nitrogen, but positively correlated with C/N ratio, and weakly correlated with other physicochemical properties.