本文研究了灰漠上和碱化灰漠土中小麦根际、非根际土壤中过氧化氢酶、脲酶和磷酸酶活性变化。在灰漠上小麦根际上中，上述各酶活性均大于非根际上中的各酶活性；在磁化灰漠土中，根际的过氧化氢酶和磷酸酶活性大于非根际上中，脲酶活性变化则相反。本文还初步研究了小麦不同生育期报际和非根际上中过氧化氢酶、脲酸和磷酸酶活性的变化。 In this paper, the changes of catalase, urease and phosphatase activities in rhizosphere soil and non-rhizosphere soil of gray desertification and alkaline soil desertification were studied. In the gray desert on the wheat rhizosphere, the above enzyme activity were greater than non-rhizosphere in the enzyme activity; in the desertified soil, rhizosphere catalase and phosphatase activity than non-rhizosphere , Urease activity changes the opposite. In this paper, the changes of catalase, uronic acid and phosphatase activities in the inter-and non-rhizosphere of wheat at different growth stages were also preliminary studied.