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Title:: Seedling Emergence and Growth Responses of Haloxylon ammodendron to Sand Burial Depth

Author(s):: LYU Chaoyan1; 2; ZHANG Ximing2; GAO Zhixi1; HAN Chang1; WANG Jiazhen3; ZHANG Baocheng3; (1.School of Agriculture and Technology，Zunyi Normal College，Zunyi，Guizhou 563002；2.Xinjiang Institute of Ecology and Geography，Chinese Academy of Sciences，Urumqi，Xinjiang 830011；3.Department of Life Science，Zunyi Normal College，Zunyi，Guizhou 563002)

Keywords:: Haloxylon ammodendron; sand burial depth; seedling emergence rate; seedling growth; biomass allocation

Abstract:: Sand burial was one of the main stress on growth and distribution of sandy plant，and it is also the main factor that affected seed germination，seedling survival and growth in sandy land.To investigate the effect of burial depth on the Haloxylon ammodendron seedling’s emergence and growth in its typical natural habitats，a simulated study was conducted with five sand burial depth (0，0.5，1.0，2.0，3.0 cm).The results showed that the seedling emergence rate increased first but decreased then with increasing burial depth，being 4.2%，31.9%,14.7%，0.9% and 0% when the burial depth were 0，0.5，1.0，2.0，3.0 cm.And during the early stage of seedling emergence the seedling mortality was high in each treatment with average 80.7%.After that it decreased and it was significantly higher in 2.0 cm than the other.Additionally，the seedling shoot and root growth and the root/shoot ratio in 0.5 cm were higher than 0 cm and 1.0 cm during the early stage of seedling emergence.And this difference became small with the time.It was suggested that the optimal sand burial depth of H.ammodendron for its seedling emergence and growth would be 0.5 cm.Totally，it could be concluded that moderate burial could promote the seed germination，seedling emergence and its growth of H.ammodendron, but intensive burial could restrain its grown，even lead the seedling to die.