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哀牢山木果柯林及退化植被下土壤氮素矿化和硝化作用(英文)
引用本文:李贵才,韩兴国,黄建辉.哀牢山木果柯林及退化植被下土壤氮素矿化和硝化作用(英文)[J].Acta Botanica Sinica,2004,46(2):194-201.
作者姓名:李贵才  韩兴国  黄建辉
作者单位:中国科学院植物研究所植被数量生态学重点实验室,中国科学院植物研究所植被数量生态学重点实验室,中国科学院植物研究所植被数量生态学重点实验室 北京 100093 中国科学院遥感应用研究所遥感信息科学实验室,北京 100101,北京 100093,北京 100093
基金项目:国家自然科学基金(40071085),中国科学院知识创新工程重大项目(KZCX1-SW-01-02)~~
摘    要:采用封顶埋管法,我们于11月对21至次年4月15日,分3个培养期共165天(包括干季初期、中期和末期),对哀牢山原生本果柯林(Lithocarpus xylocarpus forest)、栎类次生林(sccondary oak forest)和人工茶叶地(tea planation)三种群落类型的土壤氮素矿化和硝化作用进行了研究。结果表明:在3个培养期中,不同群落下土壤的氮素矿化和硝化作用都具有明显差异;而且它们均具有明显的干季动态,但变化趋势不尽相同。净氨化速率远高于净硝化速率,后者约为前者的0.5%~10%。结果表明,培养期、群落类型和样方诸因子对净氮矿化速率和净硝化速率的影响均存在不同程度的交互作用。人为干扰能导致氮素矿化和硝化速率等生态系统过程的变化,我们的研究结果为此提供了证据支持。与木果柯原始林相比,茶地和次生林的氮素转化过程更多地受物理因素的控制(如温度和水分)。这意味着哀牢山地区的木果柯原始林的保护应该受到重视。

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

N Mineralization and Nitrification in a Primary Lithocarpus xylocarpus Forest and Degraded Vegetation in the Ailao Mountain, Yunnan Province
Authors:LIGui-Cai HANXing-Guo HUANGJian-Hui
Institution:LaboratoryofQuantitativeVegetationEcology,InstituteBeijing100093,China
Abstract: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.
Keywords:Lithocarpus xylocarpus forest  net mineralization rate (Rm)  net ammonification rate (RA)  net nitrification rate (RN)
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