Low nitrate retention capacity in calcareous soil under woodland in the karst region of southwestern China

摘要：

　　A 15N-tracing study was conducted to investigate the gross N transformation rates involved in the production and consumption of NH4+and NO3-in karst region soils(a calcareous and a red soil)from southwest China under woodland.The gross mineralization rate of organic N to NH4+was much lower in calcareous soil(3.71 mg N kg-1 d-1)than in red soil(5.57 mg N kg-1 d-1),while the total gross nitrification rate was significantly higher in calcareous soil(5.80 mg N kg-1 d-1)than in red soil(0.70 mg N kg-1 d-1).Microbial NO3-immobilization accounted for 2.9%and 153%of the total nitrification in calcareous soil and red soils respectively.Thus the calcareous soils in the karst region have a low biological N retention capacity and high N losses,which are further aggravated by the high precipitation and fractured soil structure.

关键词： Karst Calcareous soil 15N dilution technique Gross nitrogen transformations Nitrate retention

作者: Tongbin Zhu Siman Zeng Hanlian Qin Kexin Zhou Hui Yang Funing Lan Fen Huang Jinhua Cao Christoph Müller

作者单位: Institute of Karst Geology,CAGS,Karst Dynamics Laboratory,MLR and Guangxi,Guilin 541004,China;Intern Soil Ecology Lab,College of Resources and Environmental Sciences,Nanjing Agricultural University,Nan Institute of Karst Geology,CAGS,Karst Dynamics Laboratory,MLR and Guangxi,Guilin 541004,China Nanjing Institute of Environmental Sciences,Ministry of Environmental Protection,Nanjing 210042,Chin Institute of Karst Geology,CAGS,Karst Dynamics Laboratory,MLR and Guangxi,Guilin 541004,China;Intern Department of Plant Ecology,Justus-Liebig University Giessen,Heinrich-Buff-Ring 26,35392 Giessen,Ger

会议类型: 国内会议

会议名称: 国土资源部广西岩溶动力学重点实验室和国土资源部岩溶生态系统与石漠化治理重点实验室2016年度学术委员会会议

会议地点: 广西桂林

会议语种:英文

页码: 99-101

在线出版日期: 2016-12-02（万方平台首次上网日期，不代表论文的发表时间）