Soil Seed Bank and Natural Regeneration Potential of Reaumuria Soongorica Shrubs at Different Slope Positions in Loess Hilly and Gully Region

YANG Caihong; LI Yi; SHAN Lishan; DUAN Yanan

doi:10.13961/j.cnki.stbctb.2016.02.020

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Soil Seed Bank and Natural Regeneration Potential of Reaumuria Soongorica Shrubs at Different Slope Positions in Loess Hilly and Gully Region

- Soil Seed Bank and Natural Regeneration Potential of Reaumuria Soongorica Shrubs at Different Slope Positions in Loess Hilly and Gully Region
- Bulletin of Soiland Water Conservation Vol. 36, Issue 2, Pages: 105-109(2016)
- 作者机构：
  
  甘肃农业大学林学院,甘肃,兰州,730070
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2016.02.020
  CLC：
- Published：2016
- 稿件说明：
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YANG Caihong, LI Yi, SHAN Lishan, et al. Soil Seed Bank and Natural Regeneration Potential of Reaumuria Soongorica Shrubs at Different Slope Positions in Loess Hilly and Gully Region[J]. Bulletin of Soiland Water Conservation, 2016, 36(2): 105-109.
DOI：

YANG Caihong, LI Yi, SHAN Lishan, et al. Soil Seed Bank and Natural Regeneration Potential of Reaumuria Soongorica Shrubs at Different Slope Positions in Loess Hilly and Gully Region[J]. Bulletin of Soiland Water Conservation, 2016, 36(2): 105-109. DOI： 10.13961/j.cnki.stbctb.2016.02.020.

摘要

[目的

]

对黄土丘陵沟壑区红砂灌丛植被土壤种子库的特征及红砂灌丛植被自然更新潜力进行分析和评估

以说明红砂灌丛土壤种子库在植被恢复与重建中的重要作用。[方法

]

采用土壤种子库"萌发法"(每个地段10个2 m×2 m样方内分表土层0-2 cm和2-5 cm土层采集土样)及野外植被调查方法

对黄土丘陵沟壑不同坡位红砂灌丛土壤种子库进行研究。[结果

]

黄土丘陵沟壑区红砂灌丛植被土壤种子库发芽试验共观察到的4 251株幼苗

分属于9个物种。土壤种子库密度在100~1 000粒/m

物种数在0.8~1.2种/0.01 m

下坡段的土壤种子库平均种子密度和平均物种数均比上坡段高。3个坡段的2个层次的平均种子密度和平均物种数均随土层加深而减小。3个坡段土壤种子库和地上植被的组成物种多为草本植物和红砂灌丛

地上植被与其土壤种子库的密度及物种数均呈不显著相关;物种组成的Sorensen相似性指数较高

均达到0.60以上

且土壤种子库比地上植被具有更高的物种丰富度。[结论

]

黄土丘陵沟壑区红砂灌丛具有依靠土壤种子库实现自然更新的潜力

但由于物种组成种类较少

现存灌丛植被一旦遭到破坏

仅靠土壤种子库恢复现存植被是困难的

需要在对自然恢复潜力评估的基础上

积极采取人工保护促进自然恢复的策略。

Abstract

[Objective] To evaluate and predict the natural regeneration potential of Reaumuria soongorica shrub vegetation in the hilly-gullied loess plateau region

we investigated the soil seed bank and its associated vegetation in the upper

middle and the lower slope site. [Methods] Seed germination method and field vegetation survey were both used. Ten plots(2 m×2 m) at each site were established for vegetation investigation and seed bank sampling at layers of 0-2 cm and 2-5 cm. [Results] A total of 4 251 seedlings belonging to 9 species of the soil seed banks were recorded. The soil seed bank density was 100~1 000 seed/m2 and the number of species was 0.8~1.2 species/0.01 m2. Both the mean seed density(seed/m2) and the mean number of species(species/0.01 m2) were found to be higher in the lower slope site than that in the upper slope site. The mean values of the seed density and the species number for soil seed bank at 0-2 cm soil layer were significant higher than that of 2-5 cm soil layer for all three slope sites. Most of the species found in the soil seed banks and in aboveground vegetations at the three slope sites were herb and Reaumuria soongorica shrub vegetation. The mean density and the mean number of species in the soil seed banks were not correlated with the ones of vegetation. Soil seed bank was found had high similarity(Sorensen's index > 0.60) to its associated vegetation in species composition. And the species richness of soil seed banks was higher than that of aboveground vegetations. [Conclusion] Natural regeneration potential of Reaumuria soongorica shrub vegetation by germination of soil seed banks in the hilly-gullied loess plateau region was low. Once the present vegetation is destroyed

the natural restoration of vegetations is hardly possible. Therefore

artificial restoration strategy in combination with natural regeneration should be applied to promote vegetation recovery.

关键词

Keywords

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