【摘要】 为揭示化感水稻根际土壤酶活性与水稻化感潜力的关系,在前期研究的基础上,以化感水稻"PI312777"、"IAC47"、"Iguape"和非化感水稻"Lemont"为材料,测定了苗期旱作水稻根际土壤酶活性。结果表明,化感水稻抑制了根际土壤的脱氢酶、过氧化物酶、多酚氧化酶、脲酶活性、纤维素分解酶活性,提高了酸性磷酸酶、碱性磷酸酶、蔗糖酶、过氧化氢酶活性。脲酶、多酚氧化酶活性与水稻化感潜力呈显著负相关,酸性磷酸酶、碱性磷酸酶与水稻化感潜力呈显著正相关,蛋白酶、脱氢酶活性与其他土壤酶、土壤微生物区系、水稻化感潜力间均无显著相关性。化感水稻降低根际土壤多酚氧化酶活性,有利于根际化感物质的积累,提高了酸性磷酸酶、碱性磷酸酶、蔗糖酶活性,促进土壤磷、碳循环,为实现水稻化感效应奠定基础。更多还原

【Abstract】 In order to determine the relationship between allelopathic potential of rice and soil enzyme activity in rhizospheric soils, a dry cultivation experiment was conducted on enzyme activity in rhizospheric soil of allelopathic rice "PI312777", "IAC47" and "Iguape", and non-allelopathic rice "Lemont" at seedling stage. The results show that allelopathic rice inhibits dehydrogenase, peroxide, polyphenol oxidase, urease, and cellulose activity and enhances acid phosphatase, alkaline-phosphatase, invertase and catalase activity in rhizospheric soils. Correlation analyses show that urease and polyphenol oxidase activity is significantly negatively correlated with rice allelopathic potential, while acid phosphatase and alkaline-phosphatase activity is significantly positively correlated with rice allelopathic potential. No significant relationship exists between protease and dehydrogenase activity with other enzymes or microbial amount and rice allelopathic potiential. Allelopathic rice decreases polyphenol oxidase activity, increases acid-phosphatase, alkaline-phosphatase and invertase activity, which is beneficial for allelopathic substance accumulation, soil carbon and phosphorus cycle enhancement.更多还原