N Mineralization and Nitrification in a Primary Lithocarpus xylocarpus Forest and Degraded Vegetation in the Ailao Mountain, Yunnan Province

编号 zgly0000328275

文献类型 期刊论文

文献题名 N Mineralization and Nitrification in a Primary Lithocarpus xylocarpus Forest and Degraded Vegetation in the Ailao Mountain, Yunnan Province

学科分类 220.1060;森林生态学

作者 LIGui-Cai  HANXing-Guo  HUANGJian-Hui 

作者单位 LaboratoryofQuantitativeVegetationEcology 

母体文献 Acta Botanica Sinica;植物学报: 英文版 

年卷期 2004,46(2)

页码 194-201

年份 2004 

分类号 Q948.113  S718.5 

关键词 木果柯林  净氮矿化率  净氨化率  净氮硝化率  哀牢山  栎类次生林  人工茶叶地 

文摘内容 Using the closed-top tube incubation method, we examined the soil nitrogen (N) mineralizationand nitrification in the primary Lithocarpus xylocarpus forest, a secondary oak forest and a tea plantationin the Ailao Mountain, Yunnan Province, China. This study was conducted in the dry season fromNovember 20, 1998 to May 15, 1999. Results showed that there were significant differences among thethree vegetation types in both net N mineralization and nitrification rates, and they also demonstratedtemporal variation. The net ammonification rate (RA) was much higher than net nitrification rate (RN), andthe latter was about 0.5%-10% of the former. Our results indicated that incubation period, vegetation typeand the location of plot all interactively affected RA, RN and net mineralization rate (RM). We providedevidence that anthropogenic disturbances could result in changes of ecosystems processes such as Nmineralization and nitrification rates. It is obvious that tea plantation and secondary growth forest havemore physically (mainly temperature and moisture) controlled N transformation processes than thewell-preserved primary L. xylocarpus forest, implying that the conservation of primary forest ecosystemsin the Ailao Mountain region should be emphasized。