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Seedling Establishment Responses of Haloxylon ammodendron to Snow Thickness(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2017年08
Page:
183-189
Research Field:
Publishing date:

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Title:
Seedling Establishment Responses of Haloxylon ammodendron to Snow Thickness
Author(s):
LYU Chaoyan12ZHANG Ximing2GAO Zhixi1HAN Chang1ZHANG Baocheng1WANG Jiazhen1
(1.Department of Biological and Agricultural Technology,Zunyi Normal College,Zunyi,Guizhou 563006;2.Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi,Xinjiang 830011)
Keywords:
Haloxylon ammodendronsnow thicknessseedling growthbiomass allocationsoil water
PACS:
-
DOI:
10.11937/bfyy.201708042
Abstract:
The seedling establishment process is a critical stage for the success of plant regeneration.For arid zones,water is the key limiting environmental impact factor of the seedling establishment process.In this study,the typical natural habitats of Haloxylon ammodendron were selected.To simulate the snow thickness in different years,four water supply of 16,28,48,72 mm were designed to study the coupling relationship between seedling growth especially root growth of H.ammodendron and soil water content.The results showed that,the growth of H.ammodendron seedling was obviously seasonal by the change of soil moisture.In the early growing season (April to June),the root/shoot ratio of the seedling was the highest in the whole growth season,the vertical root length was 8—10 times higher than the seedling height,and the vertical root growth rate was 7—11 times higher than the high growth rate.In the early growing season (April to June) and late (September to October),the root/shoot ratios of seedlings treated with 72 mm water supply were greater than 28 mm and 48 mm.72 mm water treatment,the root depth in different periods had reached the corresponding deeper soil level with relatively good water condition after the surface soil moisture decreased.And it would ensure the good growth of H.ammodendron seedling.While the 28 mm and 48 mm treatments failed to reach the corresponding soil moisture level at the time of drought,which was not conducive to seedling growth.In conclusion,the changes of soil moisture caused by the thickness of snow affected the growth and biomass allocation of H.ammodendron seedling deeply.The increase of snow thickness would facilitate the early growth of H.ammodendron seedling,especially the roots,and then use the deeper soil moisture.It would help the seedling to survive trough the harsh drought period and to achieve the seedling establishment.

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Last Update: 2017-05-08