河套灌区微咸淡水交替灌溉对加工番茄根系生长的影响
Effect of alternative irrigation between brackish water and fresh water on root growth of processing tomato in Hetao

为研究微咸水灌溉对加工番茄根系生长的影响,于2013-2014年连续2年在河套灌区对加工番茄进行不同生育期微咸水(矿化度3 g/L)淡水(矿化度1 g/L)交替灌溉的田间试验。结果表明:1)番茄根系的干物质量主要集中在0~20 cm的土层,在开花期进行微咸水灌溉处理,番茄的根长密度较淡水灌溉减小25%~30%,根表面积减小约20%;果期进行微咸水灌溉处理,番茄的根长密度较淡水灌溉增加22%~24%,根表面积增加20%~30%;开花期和果期都进行微咸水灌溉处理对根系总长度、根长密度和根表面积没有显著影响。2)微咸水对根系的影响主要集中体现在直径<2 mm的根系上。3)微咸水灌溉对加工番茄根系的空间分布没有显著影响。
To study the effect of brackish water irrigation on root growth of processing tomato,experiment of alternate irrigation between brackish water and fresh water was carried on a two-year (2013-2014) field in Hetao irrigation district.Results showed that:1) The amount of dry matter was mainly concentrated in 0-20 cm soil layer.The treatment of brackish water throughout the flowering stage inhibited the root growth,while the root length density decreased by 25%-30% and the root surface area decreased by 20%.Throughout the fruiting stage,the treatment of brackish water irrigation promoted the root development with the root length density increasing by 22%-24% and the root surface area increasing by 20%-30%.However,the total length of root,root length density and root surface area was not affected by the treatment of brackish water throughout the whole growth stage;2) Main influence was reflected on roots with the diameter of less than 2 mm;3) There was no significant effect on processing tomato's root spatial distribution under brackish water irrigation.