Studies On Desert Microbiotic Crust Characteristics In Erdos Sandland Area

Microbiotic crust act important parts in preventing desertification, soil corrosion, and in influencing humidity distribution. In resent years, domestic and overseas scientists have done lots of correlative research, but reports about microbiotic crusts in Erdos seldom appear. This paper has done a pilot study on the characteristics of microbiotic crusts in Erdos, the result shows that particle size composition of microbiotic crust are fine sand and thick powder sand, but particle size composition of wind-drift sand are coarse sand and fine sand; that microbiotic crust can influence the reallocation of precipitation and can reduce the evaporation of infiltration moisture; and that all of the content, molecular makeup, complexity extent and the changing of optic characteristics of crust humus takes on obvious zone particularity, which indicates the development of crust soil takes on climatic zonation and is a precondition of sand soil evolvement; that soil enzyme activity is affinitive with edaphon content, enzyme activity of all the catalase, urease, sucrase ( except for polyphenol oxidase) are more active than comparison wind-drift sand, what means once crust came into being, then the content of soil organic matters will increase, the activity of microbe and soil enzyme will enhance, the organism of crust microbes will enhance the soil nutrient after they died, thus provide a entironment for altitude vegetation subsistence; that microbiotic crust possesses functions of water conservation and nutrients enrichment; that artificial algae crusts can enrich plant diversity.