Effects of Sand-burying on Seed Germination and Seedling Growth of Haloxylon ammodendron
This paper studied the effects of sand-burying on the seed germination and seedling emergence and growth of Haloxylon ammodendron in a typical arid desert region under nature conditions.Six treatments of sand-burying of depths 0,1,2,3,4 cm and 5 cm were designed and each treatment included five replicates.Results demonstrated that the seedling emergence decreased with increasing sand-burying depth.The optimal sand-burying depth for seedling emergence of H.ammodendron was 1 cm and the seedling emergence rate at this depth was 39.2 ％.The depth of 4 cm was the maximum depth for H.ammodendron to emerge.However,the seedling growth rate and survival rate of H.ammodendron increased with increasing sand-burying depth.The seedling survival rate of H.ammodendron at 4 cm burial depth was 100％ and the survival rate at 0 cm was 0.Considering both seed germination rate and seedling survival rate,the optimal burial depth was 2 cm and the seedlings at 2 cm burial depth were the main source for population regeneration.Seedling height was significantly affected by the sand burial depth.At the same period,the maximum seedling height of H.ammodendron was at 4 cm sand burial depth and the minimum was at 0 cm.In the first year,the seedling height of H.ammodendron unearthed from 4 cm was 21.5 cm and the height of seedling unearthed from surface was only 2.76 cm.
NETL
NSTL
万方数据
维普
