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    于海霞, 戴伟, 夏良放, 邓宗付, 王旭琴, 聂立水. 亚热带不同人工林对土壤酶活性及其动力学特征的影响[J]. 北京林业大学学报, 2007, 29(1): 114-118. DOI: 10.13332/j.1000-1522.2007.01.020
    引用本文: 于海霞, 戴伟, 夏良放, 邓宗付, 王旭琴, 聂立水. 亚热带不同人工林对土壤酶活性及其动力学特征的影响[J]. 北京林业大学学报, 2007, 29(1): 114-118. DOI: 10.13332/j.1000-1522.2007.01.020
    YU Hai-xia, DAI Wei, XIA Liang-fang, DENG Zong-fu, WANG Xu-qin, NIE Li-shui. Effects of different plantations on the activity of soil enzymes and their kinetic characteristics in subtropical zone[J]. Journal of Beijing Forestry University, 2007, 29(1): 114-118. DOI: 10.13332/j.1000-1522.2007.01.020
    Citation: YU Hai-xia, DAI Wei, XIA Liang-fang, DENG Zong-fu, WANG Xu-qin, NIE Li-shui. Effects of different plantations on the activity of soil enzymes and their kinetic characteristics in subtropical zone[J]. Journal of Beijing Forestry University, 2007, 29(1): 114-118. DOI: 10.13332/j.1000-1522.2007.01.020

    亚热带不同人工林对土壤酶活性及其动力学特征的影响

    Effects of different plantations on the activity of soil enzymes and their kinetic characteristics in subtropical zone

    • 摘要: 在江西省大岗山区选取杉木林、马褂木林、马尾松林、马褂木-桤木混交林4种人工林及对照次生林,通过对林下土壤脲酶、过氧化物酶、多酚氧化酶的活性及其动力学特征进行比较分析,探讨天然次生林采伐更新为不同人工林类型后,对土壤酶活性及其动力学特征的影响.结果表明:①4种人工林的土壤脲酶、过氧化物酶和多酚氧化酶的活性,VmaxVmax/Km随土壤深度的增加而降低.②与对照次生林相比,杉木林0~0.2 m土层的脲酶、过氧化物酶、多酚氧化酶活性分别降低了35%、4%、58%;脲酶的VmaxVmax/Km降低了46%和47%,其他土壤酶的动力学参数也有降低的趋势.③马褂木林的土壤酶活性及各项动力学参数均出现下降现象.④马尾松林0~0.2 m和0.2~0.4 m土层的脲酶活性分别降低了54%和62%,过氧化物酶活性均增加了23%,多酚氧化酶活性分别增加了28%和42%;过氧化物酶Km值分别降低了44%和48%,Vmax/Km增加了58%和92%,脲酶各项动力学参数明显降低,而多酚氧化酶各项动力学参数均增加.⑤混交林0~0.2 m土层的脲酶和多酚氧化酶活性分别降低了38%和9%,但过氧化物酶活性变化不明显;多酚氧化酶、过氧化物酶、脲酶的Vmax/Km分别下降了7%、38%、54%.

       

      Abstract: The activity of three soil enzymes (ureases, peroxidases and polyphenol oxidases) and the corresponding kinetic characteristics (Vmax, Vmax/Km and Km) were studied by comparing four regenerated plantations (Cunninghamia lanceolata plantation, Liriodendron chinense plantation, Pinus massoniana plantation, Alnus-Liriodendron mixed plantation) with the local natural secondary forests in subtropical zone of Dagang Mountains of Jiangxi Province.The results showed that:1) the enzyme activity, Vmax and Vmax/Km of soil ureases, peroxidases and polyphenol oxidases of the four different plantations decreased with the increase of soil depth;2) comparing with the natural secondary forests, the activity of ureases, peroxidases and polyphenol oxidases of C.lanceolata plantation decreased by 35%, 4% and 58% respectively in the depth of 0-0.2 m, while Vmax and Vmax/Km of soil ureases decreased by 46% and 47%;3) the activity of other soil enzymes had the same tendency in this plantation;4) and the soil enzyme activity and kinetic characteristics in the L.chinense plantation decreased too.In the soil depth of 0 (-) 0.2 m and 0.2 (-) 0.4 m in P.massoniana plantation, the activity of ureases decreased by 54% and 62% respectively, while the peroxidases both increased by 23%, and polyphenol oxidases decreased by 28% and 42% respectively.Km of peroxidases decreased by 44% and 48%, while Vmax/Km increased by 58% and 92% respectively.All the kinetic parameters of soil ureases decreased evidently, while polyphenol oxidases increased;5) the activity of soil ureases and polyphenol oxidases in the depth of 0 (-) 0.2 m of the Alnus-Liriodendron mixed forests decreased by 38% and 9%, and Vmax/Km of ureases, peroxidases and polyphenol oxidases decreased by 7%, 38% and 54% respectively, but the activity of peroxidases showed no evident changes.

       

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