Abstract: Soil enzymes are bioactive proteins in soil.And soil is good medium of soil enzymes, not only because the soil pro-3 期唐东山等:人工藻结皮对库布齐沙地土壤酶活性的影响 343 vides sorts of catalytic conditions (such as temperature, water, pH, reactant and so on), but also because soil can prevent soil enzymes from deactivation by combining with them through covalent bond, electrovalent bond or hydrogen bond.About 60 soil enzymes have been found by now, which mainly result from soil microorganisms.Soil enzymes act as an important role in the transforming of plant nutrition elements.The leading function of soil enzymes is taking part in the circulation of nutrition elements, such as C, N, P, S, and so on.Together with soil microorganisms, soil enzymes promote all of the reactions involved soil bio-chemical processes.Therefore, the activities of soil enzymes are universally taken for as characteristic index of soil quality.Chinese scientists began to study soil enzymes in 1960' s, and in 1980' s, along with the development of environmental sciences, the studies of soil enzymes became more and more important.To our knowledge, the studies mainly focused on farmland ecosystem, and some on the relationship of soil enzymes and environmental pollution, few studies have been made on the possible effects of soil enzymes in desert ecosystem, still less using soil enzymes as a way to manage and restore the desert ecosystems.