灌溉水矿化度对油葵根系生长及产量的影响

为了探明灌溉水矿化度对油葵根系生长特性的影响及减产机制,在田间试验条件下,以淡水处理作为对照,研究了灌溉水矿化度分别为3、4、5、6 g/L时0～40 cm土层油葵根系特性及相应的产量.结果表明:随着灌溉水矿化度的增大,0～40土层中的根系干物质总量逐渐减小,根系平均直径逐渐减小,根表面积显著减小,并且微咸水灌溉使油葵根系在各层土壤中的分布比例发生改变;与淡水处理相比较,3 g/L处理油葵产量略有降低,4、5、6 g/L处理分别减产5.58%、20.14%和38.75%,是其根系特征的一种响应.

Effect of saline water on root properties and yield of helianthus

To ascertain the root properties of helianthus and mechanism of yield decreasing under different salinity of irrigation water, root properties and yield of helianthus irrigated by water whose salinity is 3 g/L,4 g/L,5 g/L and 6 g/L respectively on the condition of field experiments with fresh water treatment as the control. The results show that in company with the increase of salinity of irrigation water, total dry matter, mean diameter and surface area of root in 0 - 40 cm soil horizon decrease gradually. Distribution ratio of root in different soil horizons have been influenced after irrigated by saline water. Compared with fresh water treatment, the yield of 3 g/L treatment reduces slightly, and that of 4 g/L,5 g/ L and 6 g/L treatment reduces by 5.58% ,20.14% and 38.75% respectively, which is a reaction of root properties.