庐山不同森林植被下土壤酶活性及微生物特性研究
毕业论文关键词：土壤酶活性；微生物量碳氮磷；微生物特性；森林植被类型；庐山
Research on soil enzyme activity and microbial characteristics under different forest vegetation in Mt.Lushan
Abstract: This paper measured the activities of soil cellulase, urease, catalase, polyphenol oxidase and acid phosphatase in eight typical vegetation zones. We also studied the evolution characterstics of soil microbial biomass and the functional persity of soilmicrobial community in Lushan. The results show that: (1)Mt jade bamboo forest has the highest cellulase enzyme activity, bushwood has the lowest; Eight kinds of forest vegetation types of urease activity are bushwood > evergreen and deciduous broad-leaved mixed forest > evergreen broad-leaf forest >broadleaved deciduous forest > pinus massoniana forest > Mt jade bamboo
forest > pinus taiwanensis forest > mixed coniferous broad leaved forest; evergreen and deciduous broad -leaved mixed forest has the highest catalase enzyme activity, pinus massoniana forest has the lowest; evergreen broad-leaf forest has the highest polyphenol oxidase enzyme activity, mixed coniferous broad- leaved forest has the lowest; eight kinds of forest vegetation types of acid phosphatase activity are Mt jade bamboo forest > evergreen broad-leaf forest > evergreen and deciduous broad leaved mixed forest> broad- leaved deciduous forest > mixed coniferous broad leaved forest > bushwood > pinus massoniana forest > pinus taiwanensis forest; with the soil deepen, thesoil enzyme activity decline, there is significantly difference between the surface soil(0 ~20 cm) and the subsoil(20~ 40 cm), soil in 20 ~ 40 cm and 40 ~ 60 cm enzyme activity is not obviously different. (2) soil microbial biomass carbon，nitrogen and phosphorus under different vegetation types have differences. Evergreen and deciduous broad-leaved forest and evergreen and deciduous broad-leaved forest of microbial carbon and nitrogen and phosphorus are obviously higher than the average of a brush, the soil microbial biomass carbon nitrogen and phosphorus of brushwood are the lowest; As the soil deepen, soil microbial biomass carbon and nitrogen phosphorus is declining, and the of difference 0~20 cm and 20~40 cm is obvious; MBC/SOC of Lushan soil is 2.57 ~4.18%; MBP/TP is7.72~24.42%.(3)Bushwood’s Shannon persity index is the biggest，pinus taiwanensis forest’s is the shallest. The differrences of shannon persity index under different vegetation in Lushan are not obvious Simpson index under different vegetation types is not obviously different overall. The change of the most common dominant species in the community is not serious overall.
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