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Soil Seed Bank of Mountain Riparian Forests in Pangquangou Nature Reserve

  • In this paper, a research about soil seed bank of 9 typical riparian forests in Pangquangou Nature Reserve was conducted. Seeds in soil were separated by soil analysis sieves (0.5 mm), and then germinated in laboratory. The results showed that the soil seed bank densities of 9 communities were among 684±108 - 2 696±266 seeds per square meter, about 69.27% - 88.65% seeds were saved in the layer of 0 - 5 cm. The seed density of Hippsphae cheilophila bush was the highest, and which of Salix cheilophila bush was the lowest. Among 5 level lines of different distances away riparian, the seed densities of 10 m and 20 m were higher than that at riparian and 30 m and 40 m from the riparian. The soil seed banks of all the 9 communities were composed of 40 species, which mainly were perennial herbs. Most shrubs and herbs were interference-resistant species. In addition, there were some typical wetland plants. Pioneer species Betula platyphylla was of the highest seeds density. Among 5 tree species of soil seed bank, no viable seeds of Quercus liaotungensis was found, the seeds of other tree species could remained viable in soil for 1 - 2 years. The seeds of most herbs could remain viable more than 2 years. According to seed banks similarity indexes, 9 communities were classified into 4 succession stages: stand initiation stage, stems exclusion stage, under-story initiation stage and old growth stage. The soil seed banks of 4 succession stages were different: seeds densities, species number and similarity between soil seed bank of latter stages were smaller than earlier stages. The soil seed bank is important for regeneration and restoration of forest in nature. This research would provide references for protection and reconstruction of riparian forests of Pangquangou Nature Reserve.
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    [14] [14] 熊利民,钟章成,李旭光,等.亚热带常绿阔叶林不同演替阶段土壤种子库的初步研究[J].植物生态学与地植物学学报,1992,16(3):249-257

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Soil Seed Bank of Mountain Riparian Forests in Pangquangou Nature Reserve

Abstract: In this paper, a research about soil seed bank of 9 typical riparian forests in Pangquangou Nature Reserve was conducted. Seeds in soil were separated by soil analysis sieves (0.5 mm), and then germinated in laboratory. The results showed that the soil seed bank densities of 9 communities were among 684±108 - 2 696±266 seeds per square meter, about 69.27% - 88.65% seeds were saved in the layer of 0 - 5 cm. The seed density of Hippsphae cheilophila bush was the highest, and which of Salix cheilophila bush was the lowest. Among 5 level lines of different distances away riparian, the seed densities of 10 m and 20 m were higher than that at riparian and 30 m and 40 m from the riparian. The soil seed banks of all the 9 communities were composed of 40 species, which mainly were perennial herbs. Most shrubs and herbs were interference-resistant species. In addition, there were some typical wetland plants. Pioneer species Betula platyphylla was of the highest seeds density. Among 5 tree species of soil seed bank, no viable seeds of Quercus liaotungensis was found, the seeds of other tree species could remained viable in soil for 1 - 2 years. The seeds of most herbs could remain viable more than 2 years. According to seed banks similarity indexes, 9 communities were classified into 4 succession stages: stand initiation stage, stems exclusion stage, under-story initiation stage and old growth stage. The soil seed banks of 4 succession stages were different: seeds densities, species number and similarity between soil seed bank of latter stages were smaller than earlier stages. The soil seed bank is important for regeneration and restoration of forest in nature. This research would provide references for protection and reconstruction of riparian forests of Pangquangou Nature Reserve.

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