首页|Response of root distribution of Haloxylon ammodendron seedlings to irrigation amounts in the hinterlands of the Taklimakan Desert, China

Response of root distribution of Haloxylon ammodendron seedlings to irrigation amounts in the hinterlands of the Taklimakan Desert, China

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We excavated soil to study root distribution in Haloxylon ammodendron seedlings grown with different amounts of irrigation (35, 24.5 and 14 kg water for each plant each time) in the hinterland of the Taklimakan Desert.The results indicated that: 1) With decreasing irrigation amounts, the root biomass tended to be distributed in deeper soil layers. Underground biomass had a signifi-cantly negative logarithmic relationship with soil depth under different irrigation amounts. 2) Maximum horizontal spread of roots was twice that of vertical root spread, and horizontal distribution of root biomass was similar under all irrigation amounts. 3) Vertical distribution of fine roots was nearly consistent with vertical changes in soil moisture, and all had a unimodal curve; but peak values of fine root biomass in different soil layers varied with different irrigation amounts. The smaller the amount of irrigation, the deeper were the fine roots concentrated in soil layers. 4) Root length, root surface area and root volume all exhibited a unimodal curve under different irrigation amounts; the less the irrigation amount, the deeper the peak values appeared in soil layers. 5) Root- shoot ratio and ratio of vertical root depth to plant height both increased as irrigation amounts decreased.

root systemroot surface areaunderground biomassroot-shoot ratio

Lishan SHAN、Ximing ZHANG、Yonghui HUA、Tingting XIE、Hailong YAN、Hua FAN

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Forestry Department, Gansu Agricultural University, Lanzhou 730070,China

Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China

Xinjiang Institute of Water Resources and Hydropower Research,Urumqi 830049, China

Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

Heilongjiang Soil and Water Conservation Scientific Research Institute,Binxian 150400, China

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2009

10.1007/s11461-009-0002-x

中国高等学校学术文摘·林学
高等教育出版社

中国高等学校学术文摘·林学

ISSN：1673-3517
年,卷(期)：2009.4(1)
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