Reclamation of very heavy coastal saline soil using drip-irrigation with saline water on salt-sensitive plants

摘要: High salt content in soil, poor soil structure and fresh water shortage are the restricting factors for construction of ecological landscapes coastal regions with very heavy saline silt-soil. The aim this work was to develop a method reclamate using drip-irrigation salt-sensitive plants. A field experiment five treatments salinity levels 0.8, 3.1, 4.7, 6.3 7.8 dS/m irrigation imposed silt-soil 2012-2014. initial experimental plots tilled broken, gravel-sand layer created at 120 cm depth. Chinese rose (Rosa chinensis) is sensitive chosen as representative plant. Soil indexes (electrical conductivity saturated extract (ECe), pH sodium adsorption ratio (SAR)), growth characters dry matter production were determined. results showed that level had no significant effect on leaching 0-120 profile, effects only occurred shallow layers. ECe SAR profile decreased time, but initially increased then decreased. Rose weight increasing salinity. values tolerance threshold 2.24 emergence 4.48 period after emergence. rate by 53.30% each unit increase root zone, zero when exceeded 536 dS/m. regulatory scheduled control matric potential (SMP) under soils effective reclamation (silt soil) species such rose. An SMP higher above -5 kPa 20 depth emitter first year -10 second year, 6 mm up 4.01 can be used scheduling, while also maintaining 50% survival rate. (C) 2014 Elsevier B.V. All rights reserved.