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陇东黄土丘陵沟壑区沙棘人工林分的年生长、土壤养分、土镶酶活性三者之间相互关联、相互影响，并均存在着季节性变化规律。研究结果表明：沙棘的年生长过程与脲酶、磷酸酶等转化土壤速效养分的酶活性季节变化规律相同，都为“夏高型”；转化酶、脱氢酶、过氧化氢酶、多酚氧化酶等与土壤有机质形成有关的酶活性季节变化规律为“秋高型”。土壤速效养分的季节变化规律为“夏低型”，夏季沙棘人工林分的年生长高峰造成了此时土壤速效养分较低的现象，而土壤酶的酶促作用又使得沙棘年生长结束时的土壤速效养分基本上恢复到年初水平，沙棘林分的自肥作用很好。
The annual growth of Hippophae rhamnoides plantations in loess hilly and gully regions of Loess Plateau, soil nutrient and soil enzyme activity are interrelated and influence each other, and there is a seasonal variation. The results showed that the annual variation of seabuckthorn was the same as that of urease, phosphatase and other soil available nutrients during the season, all of them were “summer-tall”; the activities of invertase, dehydrogenase, catalase, polyphenols Enzymes and soil organic matter formation of the enzyme activity of the seasonal variation of the “autumn high.” The seasonal variation of soil available nutrients was “summer low”. The annual growth peak of summer seabuckthorn artificial forest resulted in a low soil available nutrient at this time, and the enzymatic action of soil enzymes in turn led to the annual growth of seabuckthorn Soil available nutrients basically returned to the beginning of the year, seabuckthorn stands well from the role of fertilizer.