不同滴灌处理下沙棘林内土壤盐分变化研究

为了研究滴灌措施下干旱地区防护林内土壤盐分的变化情况,选择建平地区常见的荒山绿化树种——沙棘作为研究对象,开展了滴灌与不滴灌、不同滴灌年限处理下的土壤盐分含量研究,结果表明,滴灌处理可以明显降低浅层土壤中的盐分含量,不灌溉林地处理下土壤盐分变化情况与流动沙丘的对照处理趋于一致,但是后者盐分空间分布的异质性程度更强;滴灌后1~3年,随着年限的增加,同土层中盐分含量逐渐降低,根系生物量干重逐渐增加,且根系分布情况上移,主要集中在0~60 cm的土层中。由此可知,滴灌对浅层土的洗盐效果较好,但是滴灌时间长了根系有向浅层土层集中的趋势,建议每年大水漫灌1次,以有利于根系的下扎。

Study on Soil Salinity Changes of Hippophae rhamnoides Forest under Different Drip Irrigation

In order to study the changes of soil salinity in protective forests in arid areas under drip irrigation,Hippophae rhamnoides,a common barren hill tree species in Chaoyang area,was selected as the research object.The soil salt content under drip irrigation and non-drip irrigation and different drip irrigation years were studied.The results showed that drip irrigation treatment could significantly reduce the salt content in shallow soil.The change of soil salinity under the treatment of non-irrigated forest land was consistent with the control treatment of mobile sand dune,but the spatial distribution of salt content in the latter was more heterogeneous;After 1~3 years,with the increase of years,the salt content in the same soil layer gradually decreased,the dry weight of root biomass increased gradually,and the root distribution increased,mainly concentrated in the 0~60 cm soil layer.It can be seen that drip irrigation has a good effect on salt washing in shallow soil,but the drip irrigation time has a tendency to concentrate the shallow soil layer.It is recommended to flood the water once a year to facilitate the lowering of the root system.