三种灌木抢墒植苗临界土壤含水量的研究

为了定量确定宁夏中部干旱风沙区主要旱作造林树种植苗造林成活率与土壤墒情的关系,在宁夏盐池县人工模拟不同土壤墒情梯度,开展了常用旱作造林树种柠条、花棒、杨柴3种灌木裸根苗植苗试验。结果表明:在宁夏河东沙地盐池县,当沙地土壤含水量在≤5.5%时,3种灌木旱作植苗造林成活率及苗木生长受土壤含水量影响较大,不适宜造林;当土壤含水量≥9.32%时造林,3种灌木植苗造林成活率可以达到造林验收标准,苗木高生长虽然随土壤含水量的增加,有所提高,但受土壤水分影响的程度不再明显。

Study on the Critical Soil Water Content for Early Planting in Three Shrub Species

For quantitative determine the survival rate of main xeric afforestation species accords with the critical soil moisture of acceptance standard for forestation in the arid winddrift sand region of the central part of Ningxia,a simulated artificially experiments of soil moisture gradient was conducted for planting three truncated plant of caragana, Hedysarum scoparuum and Hedysorm leave Maxim in Yanchi County.The results showed that when soil water content≤5.5%in sandy land,the survival rate and seedling growth of three shrub species were significantly effected by soil water content,was failed to afforestation;when soil water content≥59.32%in sandy land,the survival rate of three shrub species can reach the acceptance standard for afforestation,the seedling growth increased with the increasing of soil water content,but there was no significantly effected by soil water content.