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《Journal of Anhui Agricultural Sciences》 2009-16
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Effects of Litter Layer and Covering Depth on the Seedling Establishment of Atremisia frigida

YOU Yong-liang et al(Institute of Grassland Science,China Agricultural University,Beijing 100193)  
[Objective] The study aimed to research the effect of litter layer,covering depth and their interaction on germination and early growing of Atremisia frigida.[Method] With the litter layer and A.frigida seeds as the tested materials,the 4 levels of covering depth(0,0.5,1.0 and 2.0 cm) and 4 weight levels of litter layer(0,50,100 and 200 g/m2)were set up to make the test according to randomized block design with two factors.[Result] The effect of covering depth on A.frigida emergence rate was remarkable.With the increase of covering depth,the A.frigida emergence rate was decreased.The emergence rate of covering depth of 1.0 cm was 5 times lower than that without covering.The emergence rate reduced to 0 when the covering depth raised to 2.0 cm.The litter had no significant influence on emergence,but it affected the growth including height and above-ground biomass noticeably.Small amount of weed litter layer(50-100 g/m2) was good for growth of A.frigida,while once the litter reached to 200 g/m2,the physical barrier effect would get obvious and the growth of A.frigida was greatly more worse than other treatments.[Conclusion] The litter layer and covering depth could all effect obviously A.frigida seedling establishment and the A.frigida emergence rate was effected by their interaction.
【Fund】: 国家“十一五”科技支撑项目“草地生态恢复与草畜平衡关键技术研究”(2006BAD16B01)
【CateGory Index】: S812
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