晋北风沙区引种灌木根系生长与肥土效果分析

通过对晋北风沙区引种的沙枣、沙地柏等5种生态经济型灌木树种根系生长与改良土壤养分状况进行分析,5种灌木主根长均超过130 cm,一级、二级侧根总数达14条～36条。且栽植灌木3 a后,土壤肥力得到极大提高,灌木林地有机质、全氮、硝态氮、有效磷分别比对照(未栽植地)提高了27.3%,37.5%,88.9%和18.5%,其中,以连翘、枸杞、沙地柏改良效果最好。同时,所有灌木改良效果均表现出根际、灌丛下、灌丛间逐渐减小的趋势,根际肥岛效果明显,5种灌木根际间硝态氮分别比灌丛下、灌丛间高47%和150%.

Analysis of Root Growth and Soil Fertility of Introduced Shrub in Wind Sandy Area of Northern Shanxi

Root growth and soil fertility of ecological and economic introduced shrubs such as Elaeagnus angustifolia, Sabi- na vulgaris and other three kinds in wind sandy area of northern Shanxi were analyzed. The results showed that the length of taproot of 5 shrubs were more than 130 cm and the quantity of secondary root and tertiary root was from 14 to 36. Contents of organic matter, total nitrogen, nitrate nitrogen, available phosphorus in woodland of 3 years old shrubs increased by 27. 3%, 37.5%, 88.9% and 18.5% respectively compared with non-cultivated land, and Forsythia suspense, Lycium chinense, Sabina vulgaris could improve soil fertility significantly. Soil fertility gradually reduced from rhizosphere area to shrub land and contents of nitrate nitrogen of shrubs in rhizosphere area increased from 45% to 150%.