金安桥水电站不同渣场与其周边森林土壤种子库相似性研究

A Study on the Soil Seed Bank Similarity between Different Dumping Yards and Their Nearby Forests in Jinanqiao Hydropower Station

水电站建设弃渣场废弃地是植被恢复最困难区域之一,为了解渣场与其周边森林土壤种子库的关系,采用种子萌发实验的方法对金安桥水电站不同类型渣场与其周边森林土壤种子库相似性进行了研究。结果表明:就平台与相应周边森林群落土壤种子库的相似性而言,美河渣场平台与相应周边森林群落的相似性系数最高,为0.46;3#渣场平台的次之,为0.44;2#渣场平台的最小,为0.27;相似性随着距离及高差加大呈降低的趋势。平台与相应周边森林群落土壤种子库相似性系数都比边坡的大。各类型渣场土壤种子库中以十字花科、菊科为优势科,周边森林群落土壤种子库以菊科、莎草科、十字花科为优势科,均以草本为优势生活型。渣场中20个种有17种与其周边森林群落相同,土壤种子库相似性系数为0.49。

Dumping yards generated in Hydropower station construction are one of the most difficult places to restore,to know the relationship of soil seed bank between dumping yards and their nearby forests,a study on the soil seed bank similarity between different dumping yards and their nearby forests in Jinanqiao Hydropower Station was carried out based on seed germination trial. The results showed that the similarity coefficient between Meihe dumping yard platform and its nearby forest was highest of 0.46, the coefficient of 3 dumping yard platform （0.44） was lower than that, and the coefficient of 2# dumping yard platform was lowest of 0.27, it＇ s show a rule that the coefficient descended with the distance and high difference between platform and its nearby forest became longer and larger, as far as the similarity coefficient between platforms and nearby forests are concerned. The similarity coefficient between platforms and nearby forests was larger than that between side-slopes and their nearby forests. Crueiferae and Compositae were dominant families in dumping yards, Cru- ciferae and Cyperaceae and Compositae were dominant families in their nearby forests, herb were dominant life form in both dumping yards and their nearby forests, 17 species among 20 species in the dumping yards are the common species in the nearby forests, the similarity coefficient between the dumping yards and the nearby for- ests was 0.49.