Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Acta Ecologica Sinica》 2007-03
Add to Favorite Get Latest Update

Effects of biological soil crusts on soil seed bank and seed germination of desert plants in North China

SU Yan-Gui1,2, LI Xin-Rong1, CHEN Ying-Wu1, TAN Hui-Juan1, JIA Rong-Liang11 Shapotou Desert Research and Experiment Station, Cold and Arid Regions and Environmental &Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 73000, China2 Graduate school of the Chinese Academy of Sciences, Beijing 100049, China.  
We investigated the influences of algae crust and moss crust universally spreading in southeast of the Tengger Desert with four developing phrases (24-, 41-, 50-year-old crusts in the sand-binding vegetation areas and crusts in natural vegetation) on desert plants. Variable treatments (natural field condition, greenhouse and shadow) were assigned, and two soil moisture regimes were designed to investigate how desert plants responded under different moisture regimes of crusts. Our results showed that seed bank storage was significantly higher in moss crust than in algae crust. With the development of crusts, seed bank storage increased in moss crust while decreased in algae crust. With regard to the moisture, Significant differences in crust moisture were found among four developing phases for both algae and moss crust (p0.05). The higher moisture kept in crusts, the more seedlings occurred. However, crust surface temperature and subsurface temperature did not have significant effects on seed germination for both crusts (p0.05). For moss crust, more seed germination occurred under higher surface temperature, contrarily, more seed germination occurred under lower temperature on algae crust.
【Fund】: 国家自然科学基金资助项目(40471006)~~
【CateGory Index】: S154
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