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| Relationship between persistent soil seed bank and above-ground vegetation on abandoned farmland in An'sai of the North Shaanxi Province |
| Wang Ning1,2,Jia Yanfeng1,2,Jiao Juying1,Bai Wenjuan1,2,Zhang Zhenguo1,2 |
1.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Northwest A&F
University,712100,Yangling,Shaanxi;2.Graduate School of Chinese Academy of Sciences,100049,Beijing:China |
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Abstract In order to find the effects of persistent soil seed bank on the vegetation restoration on abandoned farmland in Hilly-gully area of Loess Plateau,investigation on the relationship between the persistent soil seed bank and the above-ground vegetation was taken.10 plots which abandoned for 3 to 31 years on different aspect were collected in this study.The result showed that there are 36 species belong to 15 families in the soil seed bank,the main species are annual,and also included some perennial and semi-shrub.The density of seed bank is between 1 908 seeds/m2 and 12 617 seeds/m2,and 80% is of annual.The proportion of annual declined with the time of rehabilitation,but the proportion of perennial and the typical species in this area increased with the time.The number of the species and the density increase firstly and then descend with the time.The serensen similarity index of above-ground vegetation and soil seed bank is 0.21-0.42.By the analysis of the fidelity of plants,all the preferential species in the area had the persistent soil seed bank,thus,it is considered that the persistent soil seed bank can help the vegetation restoration in part.
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Received: 15 April 2008
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