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Seed and Seedling Regeneration Dynamic in a Typical Mixed Broadleaved-Korean Pine Forest in Xiaoxing’an Mountains, China

Author: ZhangZuo
Tutor: JinGuangZe
School: Northeast Forestry University
Course: Ecology
Keywords: seed rain gap seedling recruitment seasonal dynamics death cycle
CLC: S718.5
Type: Master's thesis
Year: 2011
Downloads: 75
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Abstract


Seed dispersal and seedling recruitment are important for understanding the population distributing and the mechanisms of forest regeneration. Set the plot in 2005, we established 299 seed traps (seed traps acreage 0.5 m2) and 319 seedling sample plot (1×1) to survey the seed rain and one-year-old seedling in the central of the permanent sample plots of the broadleaved-Korean pine in Liangshui nature reserve. The composition and size of the seed rain, the gap effect to the seed rain and the relation between seed rain and the one-year-old seedling, seedling germination, death, seasonal dynamics, the gap effect to the seeding and one-year-old seeding and life cycle were analysis during the past five years. The result showed that:The composition of seed rain of major species of the broadleaved-Korean pine had a great interannual variation, Betula costata was the dominant tree specie of seed rain. The densities of Fraxinus mandshurica, Tilia mandshurica and Picea koraiensis were very little in some years however were not have seed. Quercus mangolica was found only in 2009. The gap was not significantly affected the seed rain. The pertinence was very clear between the seed rain and the one-year-old seedlings of the Abies nephrolepis, Fraxinus mandshurica, Acer mono, A. tegmentosum, A. ukurunduense and Ulmu japonica. Fraxinus mandshurica was the dominant tree specie of the one-year-old seedling, A. tegmentosum was less than Fraxinus mandshurica. The largest density of Fraxinus mandshurica and A. tegmentosum was 80% and 46.1% respectively of thefive years. The one-year-old seedlings of Abies nephrolepis, Fraxinus mandshurica, Acer mono, A. tegmentosum, A. ukurunduense were changed significantly different in various years. There were a lot of one-year-old seedlings appeared from the mid-June to the mid-July in every year. There were a lot of one-year-old seedlings died because of the cold and aridity of the winter form the end of each growing season to the next spring. Gap have significant inhibition to the seedlings, the non-gap growing environment is the major factor which caused the seedlings’death. The limiting factor of seedlings death was the soil moisture, so the death cycle of seedlings centrally appeared in the first and the second winter.

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CLC: > Agricultural Sciences > Forestry > Forestry basic science > Forest Biology > Forest Ecology
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