Rainy season direct seeding afforestation technology of Forsythia suspensa(Thunb.)Vahl.in Taihang Mountain area
A trial of direct seeding afforestation of Forsythia suspensa(Thunb.)Vahl.during the rainy season was conducted in the Taihang Mountain area.The planting methods under non irrigated conditions were probed by measuring such indica-tors as emergence rate,survival rate during winter and summer,retention rate and growth.The method induded seed treat-ment,application of water retaining agents,selection of sowing time during the rainy season,selection of afforestation site,and presence or absence of ground cover.On the 4th,9th,13th,and 20th of July,seeds treated with composite coating a-gents were sown on semi-shaded or sunny slopes,the emergence rate,retention rate,and growth were significantly higher than those of the control(CK)and other treatments.Direct seeding in late June was not conducive to seed germination due to relatively low precipitation and long rain intervals.Although there was sufficient rainfall from late July to August,contin-uous rainfall could wash away seeds,and high temperatures could inhibit seed germination.In early September,the suitable growth period for seedlings became shorter,making seedlings wintering more difficult and the retention rate decrease gradu-ally.On shaded and semi-shaded slopes with a soil layer thickness more than 12.5 cm and ground cover,the survival of seedlings during summer and winter was 80％,and the plant height got above 90.81 cm.It was concluded that direct see-ding afforestation of F.suspensa(Thunb.)Vahl.in the rainy season without irrigation was most suitable for implementation in early and middle of July,and better to do on semi-shaded slopes with soil thickness over 12.5 cm or sunny slopes with veg-etation coverage.
Taihang MountainNo irrigation conditionForsythia suspensa(Thunb.)Vahl.Rainy season direct seedingAf-forestationWeathering summer and winter
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