Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

Responses of fine root growth of Caragana microphylla shrub plantation to irrigation and nitrogen addition in a semi-arid region of northern China

HUANG Gang 1,2 ;ZHAO Xue-yong1;SU Yan-gui1;HUANG Ying-xin1;CUI Jian-yuan1.1 Naiman Desert Experimental Research Station,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou,730000,P.R.China;2 Graduate University of Chinese Academy of Sciences,Beijing,100049,P.R.China  
Root growth,distribution and production of a desert shrub in arid and semiarid areas can be regulated by water and nitrogen.We examined the responses of root growth(root length density and fine root production)to short-term irrigation,nitrogen addition and the interaction of irrigation and nitrogen addition in a 21-year-old artificial Caragana microphylla Lam.plantation in the Horqin Sandy Land in northern China.Root length density(RLD)and fine root production(FRP)in the growth season were estimated using minirhizotrons and ingrowth cores,respectively.Irrigation,nitrogen addition and their interaction significantly increased RLD(0--140 cm),and FRP(0--20 cm).In dry season,irrigation,nitrogen addition and their interaction did not have significant effects on RLD.In wet season,nitrogen addition had a significant effect on RLD by promoting root distribution into deeper soil layer.These results indicate that in the low N soil condition,root development,distribution and production of desert shrubs are strongly stimulated by N availability when soil water content is in the proper status.
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved