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Study on Soil Seed Bank of Pinus Tabulaeformis Forests in Ziwuling Mountains

Author: XiongChuQiao
Tutor: ChengJiMin
School: Northwest University of Science and Technology
Course: Grassland
Keywords: Ziwuling Maintains Pinus Tabulaeformis Forests soil seed bank revegetation
CLC: S714
Type: Master's thesis
Year: 2009
Downloads: 19
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Abstract


Field survey and laboratory observation experiment were conducted to study the character of soil seed bank for Pinus Tabulaeformis Forests in Ziwuling Mountains,such as species composition, density, and the vertical distribution of species,and the soil seed bank of barren hill was compared as a check.The main conclusion as following:1. There were 47 kinds of higher plants,which were belonged to 21 families.Prennial herb life-form to the highest proportion ,followed by deciduous shrubs ,other life-form such as deciduous trees,everygreen shrubs and annual herb was low.The direction of slope was the main effect of the growth condition of the Pinus Tabulaeformis,the sunny slope growth condition surpassed half shady side.2. The contrast of the upper vegetation between the Pinus Tabulaeformis Forests and the barren hill indicated: in the case of tree cover, shrub layer of species diversity increased, the species diversity of herb layer decreased. Correlation analysis showed that: In the herb layer, the middle slope and the check have the greatest similar coefficient, in the shrub layer,the similar coefficient between the upper slope and the down slope was biggest.3. The average reserve of seed banks was 5711 grains/m2,the minimum and the maximum storage were 3563 grains/m2 and 9537 grains/m2 respectively. The soil seed bank reserves had the rule which elevated along with the altitude gradually. The soil seed bank vertical distribution mainly concentrated in 0-2.5cm, 2.5-5cm and the 5-7.5cm three levels, the forest flooring and the 7.5-10cm level distribution were few.4. 29 kinds of seedlings were identified in the germination tests, of which only 5 kinds of shrubs, the mumber of herb species reahed 24. Pinus seedlings were not found .The 24 kinds of herb included 16 kinds of perennial herbaceous plants,8 kinds of annual herbaceous plants. Perennial herbaceous plants was the highest proportion in all kinds of life-forms.5. It showed that there was a low similar coeffection between the upper vegetation and soil seed bank in Pinus Tabulaeformis Forests ,and human disturbance and the altitude were the two valuable factors.6. The contrast between Pinus Tabulaeformis Forests and barren hill showed:there were differences in the composition of soil seed bank. The upper vegetation species diversity directly impacted the number of the soil seed bank species.The building of man-made forest was a kind of method which could raised the reserve and species diversity of the soil seed bank.

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CLC: > Agricultural Sciences > Forestry > Forestry basic science > Forest soil science
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