Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Geochimica》 2008-06
Add to Favorite Get Latest Update

Ammonium nitrogen in surface soil of arid and semiarid Central East Asia

HU Lu1,2,LEE Xin-qing1,HUANG Dai-kuan1,2 and CHENG Jian-zhong1,21.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China  
Ammonium nitrogen in soil is an important component of mineralized nitrogen,which can be absorbed and utilized by vegetation directly.Changes of-N concentration have relationship with many biochemical processes of nitrogen circle,thus a significant part in nitrogen biogeochemistry.There are various factors influencing-N concentration,however,the major factor is uncertain.With excellent gradients of vegetation and soil type zone,as well as gradients of temperature and precipitation,Central East Asia provides an ideal background for developing the relationship between Ammonium nitrogen and the climatic parameters.Analysis of surface soil from a transect that crosses the various climatic and vegetation zones reveals a significant linear correlation between-N and the mean temperature from May to September,yet a very poor relationship between-N and precipitation.And a close correlation between-N and the soil pH value is also observed.These results indicate that both variation of temperature and soil pH value are key factors affecting soil ammonium nitrogen,while the precipitation plays a short,quick,and rush impact.
【Fund】: 中国科学院创新团队国际合作伙伴计划项目;; 中国科学院百人计划项目(20020723)
【CateGory Index】: P596
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved