黄土高原沟壑区10龄沙棘林年生长开始之际7种土壤酶随坡向、坡位、土层、地类呈现出规律性变化,影响N、P水解转化的脲酶、磷酸酶、转化酶等酶活性均为阳坡大于阴坡,山坡大于沟坡,上层土壤大于下层土壤,有林地大于无林地;容重小、孔隙度大、水稳性团粒含量多的土壤酶活性较高;土壤化学性质与酶活性呈显著或极显著正相关。 The soil enzymes of seven kinds of soil showed regular changes along slope, slope position, soil layer and landform at the beginning of year of growth of Hippophae rhamnoides L. forest in the gully region of the Loess Plateau. The urease, phosphatase and invertase The activities of the enzyme in the sunny slope were larger than the shady slopes, the slopes were larger than the slopes, the upper soil was larger than the lower soil, and the forest land was larger than the non-forest land. The enzyme activity was higher in the soil with larger bulk density, And the enzyme activity was significant or very significant positive correlation.