Modeling effects of different irrigation managements on root-zone soil salinity
Chen Yanmei1,2, Wang Shaoli1,2, Gao Zhanyi1,2, Guan Xiaoyan1,2, Hu Yaqiong1,2
1.National Center for Efficient Irrigation Engineering and Technology Research-Beijing, Beijing 100048, China; 2. Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100048, China
Abstract：Taking Shahao canal irrigation region in Hetao irrigation district as an example, effects of different irrigation management on root-zone soil salinity were explored based on the SaltMod model in the paper. The model was calibrated and validated by using the data in 2008—2010, then the root-zone soil salinity in that region was simulated and predicted. The results showed that under the present irrigation and drainage conditions, the soil salinity not only stayed in a stable level, but has exhibited a slightly desalinated tendency, it was predicted that the root-zone salinity would be reduced by 3% after 10 years. During crop growth stage, the exchange between water and salt is remarked in the vertical direction; to control the soil salinity, irrigation water amount should be kept as small as possible. In winter, the root-zone soil salinity was decreased with increasing irrigation quota, but the slope of increase in the salinity was gradually decreased. According to the crop planting structure in a local irrigation district and comprehensively considering water saving irrigation, crop production, water and salt concentrations in the soil of root-zone, it is suggested that optimal irrigation net quota should be 2 700-3 500 m3/hm2 in crop growth stage, the quota in winter should be about 2 700 m3/hm2.
李志杰,孙文彦,马卫萍,等. 盐碱土改良技术回顾与展望[J]. 山东农业科学,2010(2):73-77. Li Zhijie, Sun Wenyan, Ma Weiping, et al. Review and prospects of improvement technology for saline-alkali soil[J]. Shandong Agricultural Sciences, 2010(2):73-77.(in Chinese)Singh G. Salinity-related desertification and management strategies: Indian experience[J]. Land Degradation and Development, 2009,4(20):367-385.刘阳春,何文寿,何进智,等. 盐碱地改良利用研究进展[J]. 农业科学研究,2007,28(2):68-71. Liu Yangchun, He Wenshou, He Jinzhi, et al. Progress of improvement and utilization of saline-alkali land[J]. Journal of Agricultural Sciences, 2007, 28(2):68-71.(in Chinese)You Wenrui, Meng Fanhua. Salt-water dynamics in soils: II. Effect of precipitation on salt-water dynamics[J]. Pedosphere, 1992,2(4):289-306.胡安焱,高瑾,贺屹,等. 干旱内陆灌区土壤水盐模型[J]. 水科学进展,2002,13(6):726-729. Hu Anyan, Gao Jin, He Yi, et al. Soil water and salt balance model for irrigation district in arid and inland region[J]. Advances in Water Science, 2002, 13(6):726-729.(in Chinese)岳卫峰,杨金忠,童菊秀,等. 干旱地区灌区水盐运移及平衡分析[J]. 水利学报,2008,39(5):623-626. Yue Weifeng, Yang Jinzhong, Tong Juxiu, et al. Theoretical model for delayed response of reservoir sedimentation[J]. Journal of Hydraulic Engineering, 2008,39(5):623-626.(in Chinese)余美,芮孝芳. 宁夏银北灌区水盐均衡模型及其应用[J]. 河海大学学报:自然科学版,2009,37(4):367-372. Yu Mei,Rui Xiaofang. Application of water and salt ba-lance model in Yinbei irrigation district of Ningxia[J]. Journal of Hohai University: Natural Sciences, 2009, 37(4):367-372.(in Chinese)齐学斌,庞鸿宾. 节水灌溉的环境效应研究现状及研究重点[J]. 农业工程学报,2000,16(4):37-40. Qi Xuebin, Pang Hongbin. Present situation of research on the impact of water-saving irrigation on farm land ecological environment and major problems[J]. Transactions of the CSAE, 2000,16(4):37-40.(in Chinese)巨龙,王全九,王琳芳,等. 灌水量对半干旱区土壤水盐分布特征及冬小麦产量的影响[J]. 农业工程学报,2007,23(1):86-90. Ju Long, Wang Quanjiu, Wang Linfang, et al. Effect of irrigation amounts on yield of winter wheat and distribution characteristics of soil water-salt in semi-arid region[J]. Transactions of the CSAE, 2007, 23(1):86-90.(in Chinese)管孝艳,高占义,王少丽,等. 河套灌区秋浇定额对农田土壤盐分淋失的影响[C]//现代节水高效农业与生态灌区建设(下). 昆明:云南大学出版社,2010:463-470.李瑞平,史海滨,赤江刚夫,等. 基于SHAW模型的内蒙古河套灌区秋浇节水灌溉制度[J]. 农业工程学报,2010,26(2):31-36. Li Ruiping, Shi Haibin, Takeo Akae, et al. Scheme of water saving irrigation in autumn based on SHAW model in Inner Mongolia Hetao irrigation district[J]. Transactions of the CSAE, 2010,26(2):31-36.(in Chinese)Oosterbaan R J. SaltMod: Description of Principles, User Manual, and Examples of Application[CP]. Ver 1.1. Wageningen, The Netherlands: ILRI, 2000.Bahçeci I, Dinç N, Tari A F, et al. Water and salt ba-lance studies, using SaltMod, to improve subsurface drainage design in the Konya-Çumra Plain, Turkey[J]. Agricultural Water Management, 2006,85(3):261-271.Bahçeci I, Nacar A S. Estimation of root zone salinity, using SaltMod, in the arid region of Turkey[J]. Irrigation and Drainage, 2007,56(5):601-614.Singh M, Bhattacharya A K, Singh A K, et al. Application of SaltMod in coastal clay soil in India[J]. Irrigation and Drainage Systems, 2002,16(3):213-231.戴佳信,史海滨,夏永红,等. 河套灌区套种作物需水量与灌溉制度试验研究[C]//现代节水高效农业与生态灌区建设(上). 昆明:云南大学出版社,2010:584-593.