Studies On Characteristics Of Soil Chemistry And Microorganisms For Different Vegetations In Liuxihe Reservoir Area

With typical stands of Pinus massoniana forest, Cunninghamia lanceolata forest, coniferous and broadleaf mixed forest, evergreen broadleaf forest, Phyllostachs Pubescens forest and fruit forest located at Liuxihe Reservoir Area in Guangzhou, a research has been carried out into soil mineral elements, soil microorganism, soil enzyme activity, the results show that:1. Although there is a difference among different vegetation for soil organic matter and N quantity, the difference is not obvious. Both the organic matter and nitrogen in the soil are in the order of grass soils actionmyces > soils fungi. There is a difference among 7 vegetations for the soil microorganism quantity as well, the microorganism quantity in soil of Pinus massoniana forest, Cunninghamia lanceolata forest and fruit forest are the most, and in soil of coniferous and broadleaf mixed forest, Evergreen broadleaf forest, Phyllostachs Pubescens forest low, in soil of grass the lowest. The seasonal microorganism quantity keeps the same for different vegetations, i.e. it shows as a bimodal curve, the peak appears in May, the second during September to November, and the valley in January.4. For a vegetation the quantity of soil microorganisms in physiological groups is in the following order: Ammonifiers > azotobacter > Deuto-nitrobacteria > aerophil-cellulose-decomposingbacterium > anaero-cellulose-decomposing bacterium. There is a difference for the quantity of soil microorganisms in physiological groups among different vegetation, i.e. that gross content in soil of Pinus massoniana forest, Cunninghamia lanceolata forest and Phyllostachs Pubescens forset is abundant, in coniferous and broadleaf mixed forest, Evergreen broadleaf forest and fruit forest less, and in Grass plot the least.5. There is a difference for the soil enzyme activity among different vegetaions. The neutral phosphatase activity in the soil of coniferous and broadleaf mixed forest takes the first place, of Pinus massoniana forest, Cunninghamia lanceolata forest and Evergreen broadleaf forest the second place, of fruit forest, Phyllostachs Pubescens forest and Grass plot the lowest. Invertase activity in the soil of Pinus massoniana forest is the strongest, follewed by Cunninghamia lanceolata forest, fruit forest, coniferous and broadleaf mixed forest, evergreen broadleaf forest and Phyllostachs Pubescens forest, and of Grass plot is the weakest. Urease and catalase activity in soil of coniferous and broadleaf mixed forest and Evergreen broadleaf forest are the strongest, follewed by Pinus massoniana forest, Cunninghamia lanceolata forest and Phyllostachs Pubescens forest, fruit forest, of Grass plot the weakest. The soil protease activity in soil of coniferous and broadleaf mixed forest is the strongest, follewed by evergreen broadleaf forest and Phyllostachs Pubescens forest, Pinus massoniana forest, Cunninghamia lanceolata forest and fruit forest, of Grass plot is the weakest.6. There are close positive or negative relationships between the soil microorganism and the soil nutrients, between the soil microorganism and nutrient of litter, and between the soil microorganism and the soil water quality. There are correlations among soil nutrients, litter nutrients and soil water as well. Although the correlations of the soil enzyme to the other indice are very poor, the correlation of soil enzyme with litter quantity is good.