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滇西北纳帕海湿地区域土壤速效氮组分的分异及指示意义()

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《山地学报》[ISSN:1008-2186/CN:51-1516]

Title:: Variation of Soil Rapid Available Nitrogen Components and Its Implication in Napahai LakeMarsh Region, Northwest Yunnan Mountain

Author(s):: HU Jinming; YUAN Han; LI Jie; DONG Yunxia; MA Binbin; Asian International Rivers Center, Yunnan University, Kunming 650091, China

Keywords:: wetland; soil; rapid available N component; variation; implication; Napahai

摘要:: 对纳帕海湿地区的弃耕地-中生草甸土(AFMMS)、中生草甸土(MMS)、湿草甸土(WMS)和沼泽土(MS)的0~10 cm、10~20 cm、20~30 cm层位采样,分析各层土壤速效氮(RAN)、溶解有机氮(DON)、铵态氮(NH4+-N)、硝态氮(NO3--N)含量。发现:本区4类土壤中,沼泽土各层速效氮素组分含量都显著高于其他3类土壤对应层的含量。4类土壤上层均为RAN和DON的主要分布层,且两者在上层的分异都为AFMMS

Abstract:: Contents of Rapid Available N (RAN), Dissolved Organic N (DON), Ammonium N and Nitrate N at 3 layers (1st 0-10 cm, 2nd 10-20 cm, 3rd 20-30 cm) were analyzed for the 4 soil types：Abandoned Farmland Mesophytic Meadow Soil (AFMMS), Mesophytic Meadow Soil (MMS), Wet Meadow Soil (WMS), and Marsh Soil (MS) in Napahai reserve, northwest Yunnan,China. It showed: RAN and 3 components at each layer of MS were significantly higher than those at corresponding layers of other 3 soils. RAN and DON were mainly distributed at the 1st layers for 4 soils. Both orders of RAN and DON among 4 soils were mainly shown as AFMMSMMS>WMS>MS, but DON/IN at the 1st and 2nd layer as AFMMS>WMS>MMS>MS. This study indicated variations of soil water and vegetation significantly drove the variation of soil RAN and its components. Total contents of 3 components only accounted for few percentages of RAN, meaning still large part of hydrolysable soil organic N needs to be studied. Due to its easily usable and losable with water, DON might play more important roles in soil nitrogen supplication and have important environmental implication, comparing to the relatively lower content of IN. Becoming drying would increase relative DON percentage to RAN and exacerbate its loss of wetland soil.

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备注/Memo:: 收稿日期(Received date)：2011-01-21；改回日期(Accepted) : 2011-04-04。
基金项目（Foundation item）：国家自然科学
基金项目(40961003)、云南省社会发展科技计划项目(2008CA006)。\[National Sciences Foundation of China (40961003); Social Development S&T Project, Yunnan Province (2008CA006).\]
作者简介（Biography）：胡金明(1973-)，男，安徽枞阳人，博士，教授，从事湿地生态研究。\[Hu Jinming (1973-), male, Dr. & Professor, major in study of wetland ecology.\] E-mail: jhuynu@163.com, Tel: 0871-5034577

更新日期/Last Update: 1900-01-01