%0 Journal Article
%T Effects of sand burial on biomass, chlorophyll fluorescence and extracellular polysaccharides of man-made cyanobacterial crusts under experimental conditions<br>Effects of sand burial on biomass, chlorophyll fluores-cence and extracellular polysaccharides of man-made cyanobacterial crusts under experimental conditions
%A WANG WeiBo
%A YANG CuiYun
%A TANG DongShan
%A LI DunHai
%A LIU YongDing &
%A HU ChunXiang
%A <br>
%J 中国科学C辑(英文版)
%D 2007
%I Springer
%X Soil cyanobacterial crusts occur throughout the world, especially in the semiarid and arid regions. It always encounters sand burial, which is an important feature of mobile sand dunes. A greenhouse study was conducted to determine the effects of sand burial on biomass, chlorophyll fluorescence and extracellular polysaccharides of man-made cyanobacterial crusts in six periods of time (0, 5, 10, 15, 20 and 30 d after burying) and at five depths (0, 0.2, 0.5, 1 and 2cm). The results indicated that with the increase of the burial time and burial depth extracellular polysaccharides content and Fv/Fm decreased correspondingly and there were no significant differences between 20 and 30 burial days under dif- ferent burial depths. The degradation of chlorophyll a content appeared only at 20 and 30 burial days and there was also no significant difference between them under different burial depths.It was also observed a simultaneous decrease of the values of the Fv/Fm and the content of extracellular poly-saccharides happened in the crusted cyanobacterium Microcoleus vaginatus Gom. It may suggest that there exists a relationship between extracellular polysaccharides and recovery of the activity of pho- tosystem II (PS II) after rehydration.
%K Microcoleus vaginatus Gom
%K man-made cyanobacterial crusts
%K sand burial
%K biomass
%K photosynthetic activity
%K extracellular polysaccharides<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=180CF3A72E750F3261A8A60EDC957784&aid=8F4E43FEF85DE12A07C37B25ACE3F16C&yid=A732AF04DDA03BB3&vid=771152D1ADC1C0EB&iid=E158A972A605785F&sid=BB98BB04E861B6F5&eid=D45762219109E903&journal_id=1674-7305&journal_name=ScienceChina.Lifesciences&referenced_num=0&reference_num=25