Effects of Drip System Uniformity and Irrigation Amount on Water and Salt Distributions in Soil Under Arid Conditions

doi:10.1016/S2095-3119(13)60310-X

Journal of Integrative Agriculture ›› 2013, Vol. 12 ›› Issue (5): 924-939.DOI: 10.1016/S2095-3119(13)60310-X

• 论文 • 上一篇

Effects of Drip System Uniformity and Irrigation Amount on Water and Salt Distributions in Soil Under Arid Conditions

href="https://www.chinaagrisci.com/Jwk_zgnykxen/CN/article/advancedSearchResult.do?searchSQL=(((GUAN Hong-jie[Author]) AND 1[Journal]) AND year[Order])" target="_blank">GUAN Hong-jie, href="https://www.chinaagrisci.com/Jwk_zgnykxen/CN/article/advancedSearchResult.do?searchSQL=(((LI Jiu-sheng[Author]) AND 1[Journal]) AND year[Order])" target="_blank">LI Jiu-sheng, LI Yan-feng

1.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, P.R.China
2.National Center of Efficient Irrigation Engineering and Technology Research-Beijing, Beijing 100048, P.R.China

收稿日期:2012-08-29 出版日期:2013-05-01 发布日期:2013-05-01
通讯作者: Correspondence LI Jiu-sheng, Tel: +86-10-68786545, E-mail: lijs@iwhr.com
基金资助:
This study was supported by the National Natural Science Foundation of China (50979115).

Effects of Drip System Uniformity and Irrigation Amount on Water and Salt Distributions in Soil Under Arid Conditions

GUAN Hong-jie, LI Jiu-sheng, LI Yan-feng

1.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, P.R.China
2.National Center of Efficient Irrigation Engineering and Technology Research-Beijing, Beijing 100048, P.R.China

Received:2012-08-29 Online:2013-05-01 Published:2013-05-01
Contact: Correspondence LI Jiu-sheng, Tel: +86-10-68786545, E-mail: lijs@iwhr.com
Supported by:
This study was supported by the National Natural Science Foundation of China (50979115).

摘要/Abstract

摘要： The dynamics of water and salt in soil were monitored in the 2010 and 2011 growing seasons of cotton to evaluate the salinity risk of soil under drip irrigation in arid environments for different management practices of drip system uniformity and irrigation amount. In the experiments, three Christiansen uniformity coefficients (CU) of approximately 65, 80, and 95% (referred to as low, medium, and high uniformity, respectively) and three irrigation amounts of 50, 75, and 100% of full irrigation were used. The distribution of the soil water content and bulk electrical conductivity (ECb) was monitored continuously with approximately equally spaced frequency domain reflectometry (FDR) sensors located along a dripline. Gravimetric samples of soil were collected regularly to determine the distribution of soil salinity. A great fluctuation in CU of water content and ECb at 60 cm depth was observed for the low uniformity treatment during the irrigation season, while a relatively stable variation pattern was observed for the high uniformity treatment. The ECb CU was substantially lower than the water content CU and its value was greatly related to the water content CU and the initial ECb CU. The spatial variation of seasonal mean soil water content and seasonal mean soil bulk electrical conductivity showed a high dependence on the variation pattern of emitter discharge rate along a dripline for the low and medium uniformity treatments. A greater irrigation amount produced a significantly lower soil salinity at the end of the irrigation season, while the influence of the system uniformity on the soil salinity was insignificant at a probability level of 0.1. In arid regions, the determination of the target drip irrigation system uniformity should consider the potential salinity risk of soil caused by nonuniform water application as the influence of the system uniformity on the distribution of the soil salinity was progressively strengthened during the growing season of crop.

关键词: drip irrigation , uniformity , soil water content , soil bulk electrical conductivity , soil salinity

Abstract: The dynamics of water and salt in soil were monitored in the 2010 and 2011 growing seasons of cotton to evaluate the salinity risk of soil under drip irrigation in arid environments for different management practices of drip system uniformity and irrigation amount. In the experiments, three Christiansen uniformity coefficients (CU) of approximately 65, 80, and 95% (referred to as low, medium, and high uniformity, respectively) and three irrigation amounts of 50, 75, and 100% of full irrigation were used. The distribution of the soil water content and bulk electrical conductivity (ECb) was monitored continuously with approximately equally spaced frequency domain reflectometry (FDR) sensors located along a dripline. Gravimetric samples of soil were collected regularly to determine the distribution of soil salinity. A great fluctuation in CU of water content and ECb at 60 cm depth was observed for the low uniformity treatment during the irrigation season, while a relatively stable variation pattern was observed for the high uniformity treatment. The ECb CU was substantially lower than the water content CU and its value was greatly related to the water content CU and the initial ECb CU. The spatial variation of seasonal mean soil water content and seasonal mean soil bulk electrical conductivity showed a high dependence on the variation pattern of emitter discharge rate along a dripline for the low and medium uniformity treatments. A greater irrigation amount produced a significantly lower soil salinity at the end of the irrigation season, while the influence of the system uniformity on the soil salinity was insignificant at a probability level of 0.1. In arid regions, the determination of the target drip irrigation system uniformity should consider the potential salinity risk of soil caused by nonuniform water application as the influence of the system uniformity on the distribution of the soil salinity was progressively strengthened during the growing season of crop.

Key words: drip irrigation , uniformity , soil water content , soil bulk electrical conductivity , soil salinity

GUAN Hong-jie, LI Jiu-sheng, LI Yan-feng. Effects of Drip System Uniformity and Irrigation Amount on Water and Salt Distributions in Soil Under Arid Conditions[J]. Journal of Integrative Agriculture, 2013, 12(5): 924-939.

GUAN Hong-jie, LI Jiu-sheng, , LI Yan-feng. Effects of Drip System Uniformity and Irrigation Amount on Water and Salt Distributions in Soil Under Arid Conditions[J]. Journal of Integrative Agriculture, 2013, 12(5): 924-939.

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Effects of Drip System Uniformity and Irrigation Amount on Water and Salt Distributions in Soil Under Arid Conditions

Effects of Drip System Uniformity and Irrigation Amount on Water and Salt Distributions in Soil Under Arid Conditions

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