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Seed Dormancy Characteristies of Cyperaceae Brassicaceae and Caryophyllaceae in the Aipine Meadow on the Eastern Qinghai-Tibet Plateau

Author: LiuWei
Tutor: DuGuoZuo
School: Lanzhou University
Course: Ecology
Keywords: Alpine meadow Elevation Habitat Phylogenetic Seed size Illumination Dormancy Germination
CLC: S812
Type: Master's thesis
Year: 2009
Downloads: 118
Quote: 2
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Abstract


So far, a lot of research on seed germination and dormancy of Comparative Study between species rarely, mostly concentrated in tropical or temperate regions, and even fewer for the alpine meadow habitats. Therefore, the eastern Tibetan Plateau alpine meadow sedge, cruciferous Caryophyllaceae (93) in this study the development of common plant seeds as materials research systems, lighting, seed size, habitat and altitude of seed dormancy impact, summarizes the sleep characteristics of alpine meadow species to artificial planting plant communities, restoration of degraded grassland ecological basis. Our results show that: 1) the three subjects used in this study, 15 species of sedge throughout almost no germination, more than half of the species germination percentage does not reach 20%, and that is in a dormant state, cruciferous and Caryophyllaceae dormancy is lower; 2) the same subjects the average seed dormancy rate differences among different genera than belong to more significant within the average seed dormancy rate differences; 3) used in this study, three families, 93 species, more than 1/3 (32 species) species germination optimum light intensity (10% or 40% of the light) for light but strong light in strong light; less than 1/4 (19 species), species (80% light) seed dormancy rate lowest easily in dark lighting conditions; rate of just 5 seed dormancy dormancy breaking light but inhibited seed germination; sedge seed dormancy whether very sensitive lighting; 4) in the Division level, seed dormancy rate seed size was significantly positively related to the larger seed dormancy rate is higher; 5) Acquisition of habitat differences on the Branch seed dormancy than the case within the seed dormancy is more significant; habitat differences and acquisition of several large genus is within the seed dormancy are not significant; Locality Health and environment illumination differences may not as factors affecting seed dormancy of the seed dormancy of genetic mechanisms; 6) elevation gradient only Caryophyllaceae plant seed dormancy has significantly affected, altitude gradient chickweed genera and Tinglizi of the case has a significant effect on seed dormancy genus. Comprehensive discussion of factors affecting seed germination and dormancy, we found that the phylogenetic contribution to explain the degree of seed dormancy variation. Therefore, we believe that the eastern Tibetan Plateau alpine meadow plant seed dormancy variation jointly controlled by the phylogeny, and environmental factors. Investigate seed dormancy variation between species, we should also consider the impact of ecological factors and phylogenetic history.

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CLC: > Agricultural Sciences > Livestock, animal medicine,hunting,silkworm,bee > General Animal Science > Grassland Science,prairie school
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