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Effects of man-made algal crusts on water uptake and content of topsoil in Dalateqi County of Inner Mongolia(eastern edge of Qubqi Desert)

【摘要】:正In order to determine the influence of algal crusts on water uptake(non-rainfall water) and water content of topsoil,Microcoleus vaginatus Gom.and Scytonema javanicum(Kütz) Born et Flah.isolated from microbial soil crusts of Dalateqi County(Inner Mongolia,the eastern edge of Qubqi Desert) were batch cultured in greenhouse,and spraying inoculated onto the local unstabilized sandy surface.After a week,the algal crusts formed,and algal biomass obviously changed with the soil water from that time on.With the growth of the crusts,they took up and retained more water.Among water,the part taken up from air had obvious increase since the 15~(th) day after inoculation(4.48±0.92μg Chl-a cm~(-2)),the soil water content was markedly enhanced since the 20~(th) day(1.60±0.19μg Chl -a cm~(-2) ),and the increased parts also existed even when the algae died during the dry periods.In addition,we further found that the water uptake from air accounted for 25.07-39.83%of the total water uptake,and it was mainly taken up by water vapor adsorption mechanism during the dry nights;but the part from soil substrate was even more,and it covered 60.17-74.93%.

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