Study On Sprouting And Ecological Characteristis Of Adventitious Roots Of Sabina Vulgaris In Mu Us Sandland

The sprouting and ecological characteristics of adventitious roots of natural Sabina vulgaris community in the Mu Us Sandland were studied. The results were as follows: The roots primordium which are able to develop to the adventitious roots on the 2 years old prostate stems of Sabina vulgaris are influenced by the thickness of sand-cover, the soil moisture content and other factors to sprout to the adventitious roots. For many prostate stems, it takes 3? year to touch the grund surface to grow, and another 2? years to be covered enough sand. The minimum required thickness of sand-cover for the roots primordium to sprout is about 4.0cm. The roots primordium sprout to the adventitious roots when the soil moisture content (0-40cm soil layer below the sand-covered stems) which could be improved effectively is above 1.5%. The roots of Sabina vulgaris are mainly composed of short roots .The roots (diameter 1棐3mm) are 42.05% of the total amounts and the hairy roots (diameterstems>roots>branches. The hairy roots (dimbter