Research on Salt Movement Law in Jujube Root Zone under Indirect Subsurface Drip Irrigation
In order to study transport and distribution characteristics of soil salinity under indirect subsurface drip irrigation,a field experiment was designed to analyze salt distribution characteristics and the effect of water-conducting device diameter (50,75,90 mm) and irrigation quantity (9,13,17 L/plant per time) on salt transportation in jujube root zone under indirect subsurface drip irrigation.The results showed that soil salt content of 10 ～40 cm soil layer was relatively low,and soil salt content of 0 ～ 10 cm soil layer was the highest in vertical direction,while soil salt content of each soil layer showed a increasing trend with the increase of distance from the outlet in horizontal direction under treatments after a period of time.After a single irrigation,desalination rate of each soil layer increased with the increase of irrigation quantity under a certain water-conducting device diameter.Desalination rate decreased with the increase of water-conducting device diameter in 10 ～40 cm soil layer under a certain irrigation quantity,while desalination rates in 0 ～ 10 cm and 40 ～ 50 cm soil layer had a trend of "low-high-low" with the increase of water-conducting device diameter.Soil salt content in 0 ～50 cm soil layer was relatively low when water-conducting device diameter was 75mm,irrigation quantity was respectively 13 and 17 L/plant from July to September,while soil salt content varied little.As a result,water-conducting device diameter was 75 mm,and irrigation quantity was 13 L/pant,which was the suitable treatment that determined with consideration of the factors of water-saving and restraining salt.The research results had a theoretical support for the water-salt regulation and reasonable irrigation schedule in jujube field in southern Xinjiang.
JujubeSoilIndirect subsurface drip irrigationSalt movement
国家科技期刊平台
NSTL
万方数据
维普
