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《Arid Zone Research》 2007-05
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Study on the Effect of Different Ecological Factors on the Growth of Chlorococcum humicola in Soil Microbiotic Crust

ZHANG Bing-chang1,ZHAO Jian-cheng2,ZHANG Yuan-ming1,LI Wen-zhai2,ZHENG Yun-pu2(1.Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;2.College of Life Science,Hebei Normal University,Shijiazhuang 050016,China)  
Chlorococcum humicola is a common species,and it can grow not only in humid soil,but also in arid and semiarid desert habitats.In this paper,the effects of pH,illumination intensity,temperature and three different concentrations of K+,Ca2+ and Mg2+ on the growth of Chlorococcum humicola in soil microbiotic crusts are studied by separating,purifying and cultivating C.humicola.The results show that the effects of pH and temperature on the growth of C.humicola are extremely significant,that of Ca2+ and Mg2+ concentrations on the growth of C.humicola are significant,but that of K+ concentration and illumination intensity on the growth of C.humicola are not so significant.The results also reveal that alkaline soil is advantageous for the growth of C.humicola,and the biomass of C.humicola growing under the acidic conditions is ten or several ten times lower than that under the alkaline conditions;the optimal conditions of cultivating C.humicola are at pH of 12,temperature of 25 ℃,and Ca2+ and Mg2+ concentrations of 1.77×10-4 mol·L-1 and 2.04×10-5 mol·L-1,respectively.The study results can be regarded as the theoretic bases in artificially cultivating soil microbiotic crusts in the further.
【Fund】: 中国科学院知识创新工程重要方向项目(KZCX3-SW-343);; 国家自然科学基金(40571085 90202019)资助
【CateGory Index】: S154
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