1. Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China of Ministry of Education, Nanjing, Jiangsu 210098, China; 2.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China
Abstract:A field experimental study was conducted to identify the effect of saline water irrigation on soil salinity movement and summer maize growth under subsurface drainage system. This study was comprised of nine treatments combined with three subsurface drainage depths, namely 0 m-no subsurface drainage(D0), 0.8 m(D1)and 1.2 m(D2)and three water salinity levels, such as 0.78 dS/m(S1), 3.75 dS/m(S2), and 6.25 dS/m(S3). The results indicate that the accumulated salt in the soil is effectively removed under subsurface drainage during the studied period. At the drainage depth of 80cm, the soil electronic conductivity within the root depth is decreased by 39.00%, 31.56% and 29.43% in S1, S2 and S3, respectively. But at the drainage depth of 120 cm, the soil electronic conductivity is decreased by 31.91%, 18.08% and 7.44% in S1, S2 and S3, respectively. The dry matter and yield of summer maize are reduced with increasing irrigation water salinity at the same drainage depth. The water use efficiency of summer maize from large to small is D1,D2 and D0 at the same irrigation water salinity. At the same drainage depth, the water use efficiency is decreased gradually with increasing irrigation water salinity.
[1]WANG X P, YANG J S, LIU G M, et al. Impact of irrigation volume and water salinity on winter wheat productivity and soil salinity distribution[J]. Agricultural water management, 2015, 149: 44-54.[2]王全九,单鱼洋. 微咸水灌溉与土壤水盐调控研究进展[J].农业机械学报, 2015,46(12):117-126. WANG Quanjiu, SHAN Yuyang. Review of research development on water and soil regulation with brackish water irrigation[J]. Transactions of the CSAM, 2015,46(12):117-126.(in Chinese)[3]吴忠东,王卫华,张照录,等.咸淡组合淋洗对土壤水盐分布特征的影响[J]. 排灌机械工程学报,2014,32(12):1085-1090. WU Zhongdong, WANG Weihua, ZHANG Zhaolu, et al. Effect of infiltrated by fresh and saline water alternately on water-salt distribution properties[J]. Journal of drainage and irrigation machinery engineering, 2014,32(12):1085-1090.(in Chinese)[4]张展羽,冯根祥,马海燕, 等. 微咸水膜孔沟灌土壤水盐分布与灌水质量分析[J]. 农业机械学报,2013,44(11):112-116. ZHANG Zhanyu, FENG Genxiang, MA Haiyan, et al. Analysis of soil water-salt distribution and irrigation performance under brackish water film hole furrow irrigation[J]. Transactions of the CSAM, 2013, 44(11): 112-116.(in Chinese)[5]吴忠东,王全九.不同微咸水组合灌溉对土壤水盐分布和冬小麦产量影响的田间试验研究[J].农业工程学报,2007,23(11):71-76. WU Zhongdong, WANG Quanjiu. Field study on impacts of soil water-salt distribution and winter wheat yield by different saline water combination irrigations[J]. Transactions of the CSAE, 2007,23(11):71-76.(in Chinese)[6]冯棣,张俊鹏,曹彩云,等. 适宜棉花成苗的咸水灌溉方式及矿化度指标确定[J]. 农业工程学报,2014,30(22):95-101. FENG Di, ZHANG Junpeng, CAO Caiyun, et al. Optimal irrigation method in pre-sowing irrigation with saline water and determination of mineralization degree index for cotton seedling[J]. Transactions of the CSAE, 2014, 30(22): 95-101.(in Chinese)[7]张洁,常婷婷,邵孝侯. 暗管排水对大棚土壤次生盐渍化改良及番茄产量的影响[J]. 农业工程学报,2012,28(3):81-86. ZHANG Jie, CHANG Tingting, SHAO Xiaohou. Improvement effect of subsurface drainage on secondary salinization of greenhouse soil and tomato yield[J]. Transactions of the CSAE, 2012, 28(3): 81-86.(in Chinese)[8]陈阳,张展羽,冯根祥,等. 滨海盐碱地暗管排水除盐效果试验研究[J]. 灌溉排水学报,2014,33(3):38-41. CHEN Yang, ZHANG Zhanyu, FENG Genxiang, et al. Desalination of subsurface pipe drainage in saline-alkali land of coastal areas[J]. Journal of irrigation and drai-nage, 2014, 33(3): 38-41.(in Chinese)[9]JIANG J, HUO Z L, FENG S F, et al. Effect of irrigation amount and watersalinity on water consumption and water productivity of spring wheat in northwest China[J]. Field crop research, 2012, 137: 78-88.[10]JIANG C S, CHEN S K, KUO Y M. Applying indicator-based geostatistical approaches to determine potential zones of groundwater recharge based on borehole data[J]. Catena,2013, 101: 178-187.