Supplement for the soil Seed Bank and Seed Viability of Canopy Seed Bank Along with the Railway Line of Sand Dune Areas
Seed (achene and capitulum) persistence on the parent plants, the supplement for the soil seed bank, and the maintenance of seed viability of 3 psammophyte were studied by means of field investigations and simulation experiments in sand dune areas along with the railway line. The results showed that: 1)Artemisia halodendronretained the highest number of achene and capitulum among the three study species at the end of the windy season and the start of the growing season. The delayed dispersal of achenes and capitulums differed interspecifically: the retention time wasA. halodendron >A. frigida andA. gmelinii. The persistence of canopy seed bank increased with intensifying of sand mobility; 2) Achenes were found in the soil for the 3 studied species. The maximal supplement to the soil seed bank forA. halodendron occurred in the end of windy season and the start of rainy season (the following May after maturation); 3)A. halodendron had seed viability which was higher than 80%, andA. frigida andA. gmelinii had seed viability which was less than 20% in the end of windy season and the start of rainy season. The selected psammophyte postponed seed dispersal before the end of the windy season and the onset of the rainy season. It reduced the seed loss which caused by wind erosion and sand burial, and provided the continuous supplement of seed. Canopy seed bank in sand dune areas along with the railway line played important roles in adjusting seed dispersal and timing of seed germination and seedling emergence and alleviating the impacts on seed availability and seedling recruitment, which made enlargement of population easier. The special ecological function of canopy seed bank contributes to the vegetation restoration along with the railway line of sand dune areas.
postpone dispersalgrowing seasonrailway of sand dune areasvegetation restoration
国家科技期刊平台
NSTL
万方数据
维普
