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| Effects of mulching on emergence rate of direct seeding of four tree species |
| Liu Yan1,Song Yumin2,Chen Huailiang1,Ma Fengyun1,Hou Longyu3 |
| 1.Forestry College of Shandong Agricultural University,271018,Tai'an,Shandong;2.Shandong Academy of Forestry,251000,Jinan;3.Institute of Botany,Chinese Academy of Sciences,1000193,Beijing:China |
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Abstract In order to solve the problems of drought and animal damages and so on with direct seeding in spring in Shandong barren mountain area,taking four species tree seeds as the test material,a new film mulching(film mulching 2) was studied.The results showed that compared with the conventional film mulching(film mulching 1) and open field(control area),film mulching 1 increases day average temperature of surface and soil temperature of vertical profile,which supplies suitable temperature to the generation of seeds,and that the surface temperature of film mulching 2 is higher than that of the soil,which is suitable to sow in later spring.Film mulching 2 can effectively improve water content in the soil of 020 cm depth and use limited precipitation resource and the water preservation and storage capacity are higher than these of the conventional film mulching,which efficiently settles the problems of drought and supplied a perfect water environment to seedling growth.The enmergence rate and seedling height of four tree species with film mulching methods are significantly higher than those with open field treatment.And for litter seeds,including Robinia pseudoacacia L.and Amorpha fruticosa L.,the enmergence rate and seedling height with film mulching 1 are higher,while those are greater with film mulching 2 for big seeds,including Sophora japonica L.and Gleditsia sinensis Lam..Those big seeds should be choosen in direct seeding in barren field.For direct seeding with little seeds,more grains in each hole are needed to keep high enmergence rate.
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Received: 10 September 2008
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