不同土壤基质势对滴灌枸杞生长的影响研究

采用滴头正下方0．2m深处埋设负压计控制土壤基质势下限进行水盐调控，通过田间试验研究了不同土壤基质势对宁夏枸杞生长和产量的影响。试验结果表明，2010年枸杞生长周期内，随着土壤基质势的降低，不同处理的累计灌水量显著减少，不同土壤基质势处理对枸杞生长和产量都没有显著影响。当滴头正下方0．2m处土壤基质势为-20kPa时，...

Effect of Soil Matric Potential on Lycium barbarbum L. Growth under Drip-irrigation

Field experiment was conducted to research the effect of soil matric potential on Lycium barbarbum L.growth and yield,in which controlled the soil matric potential by tensiometer at 0.2 m depth immediately under the emitters for salinity and water management.The results showed,in 2010,during Lycium barbarbum L.growing season for different treatments,with the reducing soil matric potential,seasonal irrigation amount decreased,but had no significant impact on Lycium barbarbum L.growth and yield;Moreover,when soil matric potential was kept higher than-20 kPa at 0.2 m depth immediately under the emitters,the soil salinity content reduced obviously in radial distance 0.5 m and vertical 1.2 m of emitter,especially the electrical conductivity of the saturated soil-paste extract(ECe) value decreased gradually in the roots distribution layer 40～80 cm and the deeper layer 80～120 cm;Lycium barbarbum L.of crown,twig and fruit branch were rapidest growth,the highest yields of fruit and dry were achieved.Therefore drip-irrigation Lycium barbarbum L.in Ningxia,it can be used to schedule irrigation by controlling the soil matric potential at 0.2 m depth immediately under drip emitters above-20 kPa,so ideal output and better efficiency on the leaching soil salt of crop roots range will be get.