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在极端干旱的塔克拉玛干沙漠腹地 ,利用咸水 (矿化度 4～ 5 g· L- 1 )灌溉建立人工绿地后 ,受植被和各种人为措施的影响 ,风沙土内部性质发生了一系列的变化 ,土壤酶活性也发生了变化。 1998年对不同种植时间、不同植被类型的样地布点采样 ,采样深度0～ 10 cm和 10～ 5 0 cm。分析测定了转化酶、蛋白酶、H2 O2 酶、脲酶、中性磷酸酶、碱性磷酸酶活性 ,结果表明 :1分析测定的 6种酶活性随着植被建立时间的增长而明显增强 ;2相同种植时间不同植被类型的样地土壤酶活性有差异 ,如 :相同种植时间 ,蔬菜地土壤酶活性要高于其他样地 ;3表层土壤酶活性高于下层 ,表明土壤酶活性随剖面深度下降而减弱 ;4通过相关性分析表明 ,土壤酶活性与有机质、氮、磷、微生物数量相关性显著 ;5通过与其他沙区土壤酶活性的比较 ,塔克拉玛干沙漠腹地土壤酶活性要相应低于其他沙区的流动和固定沙丘。
In the hinterland of the extremely arid Taklamakan desert, a series of changes have taken place in the internal properties of aeolian sandy soils due to the influence of vegetation and various man-made measures after the artificial greenland has been irrigated with salt water (salinity 4-5 g · L -1) , Soil enzyme activity has also changed. In 1998, sampling sites of different vegetation types and different vegetation types were sampled at depths of 0-10 cm and 10-500 cm. The activities of invertase, protease, H2O2, urease, neutral phosphatase and alkaline phosphatase were analyzed and determined. The results showed that the activity of 6 enzymes increased obviously with the time of vegetation establishment; The activities of soil enzymes in different types of vegetation at different times were different. For example, the enzyme activity of soil in vegetable field was higher than that in other plots at the same planting time. 3 The activity of soil enzyme in surface layer was higher than that in lower layer, indicating that soil enzyme activity was weakened with the decrease of depth ; 4 Correlation analysis showed that there was a significant correlation between soil enzyme activities and organic matter, nitrogen, phosphorus and microorganisms; 5 Comparison of soil enzyme activities in other desert areas showed that soil enzyme activities in the hinterland of the Taklamakan desert were lower than those in other sandy areas Flowing and fixing sand dunes.