Effect of Exogenous Phosphorus Inputs on Seed Germination of Soil Seed Bank in Marshes in Xingkai Lake
A seed bank assay was performed in a greenhouse to evaluate the effects of phosphorus enrichment on seed germination from seed banks of marshes dominated by Glyceria spiculosa and Pycreus korshinskyi, restored marsh and soybean field and paddy field in Xingkai Lake area respectively. The results showed that phosphorus nutrient inputs didn't have significant effects on the composition of species germinated from soil seed banks of natural marshes dominated by Glyceria spiculosa and Pycreus korshinskyi respectively. But with the contents of phosphorus nutrient inputs increased from 2 g/m3 to 8 g/m3, the number of seedlings germinated from the two natural marshes showed the trend from decreasing to increasing to significant decreasing, 8 g/m3 phosphorus nutrient input resulted in the number of seedlings germinated from the two natural marshes decreasing significantly. Phosphorus nutrient inputs didn' t significantly affect seedlings emergence from restored marsh and crop fields. The number of seedlings of Echinochloa crusgalli decreased significantly with 2 g/m3 phosphorus nutrient input, while Pycreus korshinskyi, Sagittaria trifolia decreased significantly with 8 g/m3 phosphorus nutrient input, which meant that phosphorus nutrient inputs might affect the number of seedlings of the species in marshes and cause the alteration of plant community structure and composition of marshes. The nutrient enrichment should be considered and controlled to protect the stabilization of plant communities and ecosystem in wetlands.
phosphorusGlyceria spiculosaPycreus korshinskyimarshnutrient inputseed bank
NETL
NSTL
万方数据
维普
