Study on Natural Regeneration of Different Shrub Forest Transformation Models on Xiaolongshan in Gansu
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1.
Research Institute of Forestry, Chinese Academy of Forestry
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2.
Key Laboratory of Tree Breeding and Cultivation,State Forestry Administration, Beijing 100091, China
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3.
Xiaolongshan Forest Experiment Bureau of Gansu Province, Tianshui 741020, Gansu, China
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Received Date:
2009-12-31
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Abstract
Natural regeneration is important on forest management and it's reflecting the trend of forest development. The quadrat method is used to study the natural regeneration density and species diversity of seedling trees under five different shrub forest transformation models on Xiaolongshan, the result show that natural regenerations under the five shrub forest transformation models are good, the number of seedling with the height class lower than 50 cm is relative less and the preserving rate of seedling with height class greater than 50 cm is higher; the dominant regeneration species is Quercus aliena for all of the five shrub forest transformation models. The natural regeneration tree species abundance of transformed Larix kaempferi stand with overall shrub cutting (Model 3) is the highest and that of transformed Pinus tabulaeformis stand with overall shrub cutting (Model 2) is the lowest; the tree species diversities of the transform models with zonal shrub cutting (Model 4 and Model 5) and transformed Pinus armandii stand with overall shrub cutting (Model 1) are higher, the distribution of tree species in stand was uniform and the concentration tendency was lower. The natural regeneration ability of Pinus armandii is stronger than that of Pinus tabulaeformis and Larix kaempferi and the transform model with zonal shrub cutting is beneficial to Pinus armandii's natural regeneration.
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Proportional views
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