Soil salinity management with drip irrigation and its effects on soil hydraulic properties in north China coastal saline soils

摘要: A field experiment with five soil matric potential (SMP) treatments (-5, -10, -15, -20 and -25 kPa) was used to study the effects of drip irrigation on salinity, hydraulic properties vegetation growth in coastal saline soils north China. Irrigation water came from local groundwater electrical conductivity 1.7-2.1 dS m(-1). The conducted over three years: 2009-2011. Soil (hydraulic conductivities, Gardner alpha contribution pore classes flow) were measured times, i.e. baseline value (CK) before 2009, after one two years salinity leaching 2010 2011, respectively. Results indicated that low zones existed experimental had expanded during when SMP controlled at higher than kPa, average saturation paste extract (ECe) root below 8 m(-1) for -5, kPa treatments, highest ratio desalinization (the removal salt content accounted percentage initial by leaching) whole profile -5 treatment 64.4%. Meanwhile, pH saturated extracts concomitantly increased profile, whereas it slightly affected under irrigation. In addition, macropores (>0.5 mm) mesopores (0.5-0.25 flow surface layer all greater those CK treatment, which structure improved. native reed [Phragmites australis (Cav.) Trin. ex Steud.] suaeda (Suaeda glauca Bge) community. After survival rate salt-tolerant plants (Hibiscus syriacus, Prunus cerasifera Ehrh., Ilex buxoides S.Y. Hu Ligustrum lucidum) 48.9% end third year treatment. Overall, based desalinization, above a depth 20 cm immediately emitter could be as an indicator scheduling rehabilitation China soils. (c) 2012 Elsevier B.V. All rights reserved.