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干旱区科学  2014, Vol. 6 Issue (3): 361-370    DOI: 10.1007/s40333-014-0001-0
  学术论文 本期目录 | 过刊浏览 | 高级检索 |
Localized salt accumulation: the main reason for cotton root length decrease during advanced growth stages under drip irrigation with mulch film in a saline soil
WenXuan MAI, ChangYan TIAN, Li LI
State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
Localized salt accumulation: the main reason for cotton root length decrease during advanced growth stages under drip irrigation with mulch film in a saline soil
WenXuan MAI, ChangYan TIAN, Li LI
State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
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摘要 High salinity in soil can prevent root growth of most plants. To investigate soil salinity dynamics under drip irrigation with mulch film (DI) and its effects on cotton root length, we conducted field experiments in saline soil based on a monolith method using flooding irrigation with mulch film (FI) as a control at the Korla Experimental Station of the Xinjiang Academy of Agricultural Sciences, China in 2009 and 2010. The results showed that the total root length decreased 120 days after sowing (DAS) under DI, and was mainly centered in the 0–30 cm soil layer and at distances of 30–70 cm from the drip-lines. There was almost complete overlap in the area of root length decline and salt accumulation. In the soil depth of 0–30 cm and at distances of 30–70 cm from the drip-lines at 110 to 160 DAS in 2009 and 171 DAS in 2010, the electrical conductivity (EC) in all soil samples was at least 3 mS/cm and in some cases exceeded 5 mS/cm under DI treatment. However, EC barely exceeded 3 mS/cm and no reduc-tion in root length was observed under FI treatment. Correlation analysis of soil EC and root length density indicated that the root length declined when the soil EC exceeded 2.8 mS/cm. The main reason for the decrease of root length in cotton under DI was localized accumulation of salinity.
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WenXuan MAI
ChangYan TIAN
Li LI
关键词:  actual evaporation  GRACE satellite data  water storage change  water balance equation  source region of the Yellow River    
Abstract: High salinity in soil can prevent root growth of most plants. To investigate soil salinity dynamics under drip irrigation with mulch film (DI) and its effects on cotton root length, we conducted field experiments in saline soil based on a monolith method using flooding irrigation with mulch film (FI) as a control at the Korla Experimental Station of the Xinjiang Academy of Agricultural Sciences, China in 2009 and 2010. The results showed that the total root length decreased 120 days after sowing (DAS) under DI, and was mainly centered in the 0–30 cm soil layer and at distances of 30–70 cm from the drip-lines. There was almost complete overlap in the area of root length decline and salt accumulation. In the soil depth of 0–30 cm and at distances of 30–70 cm from the drip-lines at 110 to 160 DAS in 2009 and 171 DAS in 2010, the electrical conductivity (EC) in all soil samples was at least 3 mS/cm and in some cases exceeded 5 mS/cm under DI treatment. However, EC barely exceeded 3 mS/cm and no reduc-tion in root length was observed under FI treatment. Correlation analysis of soil EC and root length density indicated that the root length declined when the soil EC exceeded 2.8 mS/cm. The main reason for the decrease of root length in cotton under DI was localized accumulation of salinity.
Key words:  actual evaporation    GRACE satellite data    water storage change    water balance equation    source region of the Yellow River
收稿日期:  2013-05-07      修回日期:  2013-09-25           出版日期:  2014-06-10      发布日期:  2014-06-10      期的出版日期:  2014-06-10
基金资助: 

The National Natural Science Foun-dation of China (31000252, 31201681), and the Science and Technology Supporting Project of the Department of Science and Technology of Xinjiang, China (200840102-08).

通讯作者:  Li LI    E-mail:  lili@ms.xjb.ac.cn
引用本文:    
WenXuan MAI, ChangYan TIAN, Li LI. Localized salt accumulation: the main reason for cotton root length decrease during advanced growth stages under drip irrigation with mulch film in a saline soil[J]. 干旱区科学, 2014, 6(3): 361-370.
WenXuan MAI, ChangYan TIAN, Li LI. Localized salt accumulation: the main reason for cotton root length decrease during advanced growth stages under drip irrigation with mulch film in a saline soil. Journal of Arid Land, 2014, 6(3): 361-370.
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[1] Min XU, BaiSheng YE, QiuDong ZHAO, ShiQing ZHANG, Jiang WANG. Estimation of water balance in the source region of the Yellow River based on GRACE satellite data[J]. 干旱区科学, 2013, 5(3): 384-395.
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