不同林分类型土壤不同化感型杉木无性系根际土壤酶活性季节变化

以杉木化感忍耐型和化感敏感型无性系为材料,以杉木1代林、杉木连栽2代林、杉木连栽3代林以及阔叶林土壤为培养基质,采用盆栽方法,测定了杉木不同化感型无性系根际土壤脲酶、转化酶、过氧化氢酶及多酚氧化酶活性季节动态变化.结果表明,同一林分类型土壤同一测试时间条件下,杉木化感忍耐型无性系根际土壤脲酶、转化酶、过氧化氢酶及多酚氧化酶活性均高于化感敏感型无性系;就同一杉木化感型无性系根际土壤酶活性差异而言,同一测试时间下连栽2代林土壤杉木化感忍耐型及化感敏感型无性系根际土壤脲酶、过氧化氢酶活性＞1代林土壤＞3代林土壤＞阔叶林土壤,而多酚氧化酶活性则表现为随着连栽代数的增多呈逐渐增强趋势.

Seasonal Changes of the Rhizosphere Soil Enzyme Activity of the Different Allelopathic Types of Cunninghamia lanceolata Clones in Different Stands' Soil

The different allelopathic types of Chinese fir clones （ tolerant-autotoxins clone and sensitive-autotoxins clone ） were acted as experimental materials, the soils with different generation Chinese fir plantation （include first, second and third generation）and evergreen broad-leaf forest（CK） were acted as substrates, the seasonal activities of urease, invertase, eatalase and pulyphenol oxidase in rhizospherie soils of different types of allelopathic Chinese fir clones were determined. The results indicated that the same forest types soil in the same testing time conditions, the urease, invertase, eatalase and polyphenol oxidase activity of Chinese fir tolerant-autotoxins clone rhizosphere soil were higher than the sensi- tive-autotoxins clone ; In respect of the same allelopathic types of Chinese fir clones rhizosphcre soil enzyme activity in terms of differences, in the same test time , the urease and catalase activity of second generations of the different allelopathic types of Chinese fir clones （ tolerant-autotoxins clone and sensitive-autotoxins clone ） rhizosphere soil 〉 first generation of forest soil 〉 third generation of forest soil 〉 broad-leaved forest soil, and polyphenol oxidase activity had a gradual increase trend with the increase of the active planted algebra.