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为探讨水分在利用室内培养具鞘微鞘藻构建人工藻结皮中的作用,本文研究了不同施水量和施水时间下人工藻结皮中的藻类生物量、结皮厚度、抗压强度和微结构变化.结果表明:利用具鞘微鞘藻在裸沙上接种,无水处理藻类生物量极低,无藻结皮形成.随着施水量的增加,藻结皮开始出现直至形成稳定的藻结皮,藻类生物量、结皮厚度和抗压强度显著增加,藻丝和胞外多糖逐渐增多,与沙粒缠绕成复杂的网状结构.施水15d,形成稳定的藻结皮,藻类生物量、结皮厚度和抗压强度最高.具鞘微鞘藻形成藻结皮的最适施水量是3～4L·m-2·d-1,施水时间为15d.土壤可利用水分可促进具鞘微鞘藻的代谢活动和胞外多糖合成,从而增加藻类生物量,提高其耐旱能力,早期的水分获得是其成功形成藻结皮的关键因素.研究结果将为利用荒漠藻类进行人工生物结皮恢复提供重要的理论依据.
In order to investigate the role of water in the construction of artificial algal crusts by using the culture of the sheath micro-alga, the effects of algal biomass, crust thickness, compressive strength, The results showed that the biomass of algae was very low and there was no algal crust formation when inoculated on bare sand with M. hyodysentris, and the algal crust began to appear stable with the increase of water application Algae crust, algae biomass, crust thickness and compressive strength increased significantly, algae silk and extracellular polysaccharides gradually increased, and the sand wrapped into a complex network structure. Water 15d, the formation of a stable algal crust, algae The biomass, crust thickness and compressive strength were the highest.The optimum water application rate was 3 ~ 4L · m-2 · d-1 and the water application time was 15d.And the soil available water could be Promote the metabolic activities and the synthesis of extracellular polysaccharides of M. hyodysenteriae so as to increase the algal biomass and increase the ability of drought tolerance.The early harvesting of water is the key factor for the success of the formation of algal crust.The results of this study will be to make use of desert algae Artificial biological crusts to restore provide an important theoretical basis.