中文摘要：

通过盆栽试验研究了不同有机质含量的土壤中,不同用量生物有机肥对棉花苗期土壤活性有机质和5种酶活性的影响。结果表明,不同土壤随着生物有机肥施用量的增加,其活性有机质及碳库管理指数（CMI）均显著增加。其中高有机质含量土壤施用生物有机肥20 g/kg效果显著,中等有机质含量土壤和低有机质含量土壤施用生物有机肥30、40 g/kg效果显著。5种土壤酶活性施肥处理均高于对照（CK）,并且土壤酶活性与施用量成正比。脲酶、蔗糖酶、多酚氧化酶在施用生物有机肥10、20 g/kg与其它处理相比变化显著,过氧化氢酶、蛋白酶变化不显著。相关分析表明,有机质与活性有机质和CMI在棉花出苗0 d相关系数分别为0.831＊＊、0.542＊;在出苗后60 d相关系数分别为0.928＊＊、0.635＊＊,其中有机质与活性有机质相关性最高。而CMI与有机质和活性有机质在棉花出苗0 d相关系数分别为0.542＊、0.896＊＊,在出苗后60 d分别为0.635＊＊、0.842＊＊,说明活性有机质相对于有机质与CMI关系更为密切。蔗糖酶、过氧化氢酶、多酚氧化酶与土壤有机质和活性有机质在棉花出苗0 d和出苗后60 d存在显著相关,表明活性有机质与土壤酶活性能够较好的反映肥力水平。

英文摘要：

The labile organic matter and enzyme activities of urease, protease, invertase, catalase and polyphenol oxidase were studied in soils treated with different rates of bio-organic fertilizer on soils which contained different organic matter dur- ing seedling of cotton. The results showed that： The labile organic matter and CMI were significantly increased when the or- ganic fertilizer application rate increased in different soil. Among them, high organic matter content of soil （A） application of bio-organic fertilizer 20 g/kg results were obvious ; Medium organic matter content of soil （ B ） and Low organic matter content of soil （C） application of bio-organic fertilizer 30 g/kg, 40 g/kg effect were remarkable. Fertilization of five soil enzyme activities were higher than the control （CK）. And the proportional to the amount of soil enzyme activity and appli- cation. Compared with other treatments, the changed significantly were urease, invertase and polyphenol oxidase in the ap- plication of bio-organic fertilizer 10 g/kg, 20 g/kg, but eatalase, protease did not change significantly. Correlation analy- sis showed that the correlation coefficient of the organic matter and labile organic matter and CMI in the seedling stage of cot- ton were 0. 831 ＊＊ , 0. 542 ＊ and 60 days after emergence correlation coefficient were 0. 928 ＊＊ , 0. 635 ＊＊ , which the most relevant were organic matter and labile organic matter. While the CMI and the labile organic matter and organic matter in the seedling stage of cotton were 0. 542 ＊ , 0. 896 ＊＊ and 60 days after emergence were 0. 635 ＊＊ , O. 842 ＊＊ , and the labile organ- ic matter and CMI were more closely than organic matter. The significantly related were invertase, catalase, polyphenol oxidase and soil organic matter, labile organic matter in the seedling stage and after 60 days of cotton. It showed that the labile organic matter and soil enzyme activities to better reflect the fertility level