Abstract:

To explore the nitrogen absorbing character in different root parts of Tamarix chinensis Lour., the flux of NH4+ and NO3- in the root tip, meristematic zone, elongation zone and mature region of Tamarix chinensis roots were measured by Non-invasive Micro-test Technique. The influence on the root growing of Tamarix chinensis and infection rate of Cistanche tubulosa was studied. The results showed that: (1) The NO3- was influx in the root tip, meristematic zone and elongation zone of Tamarix chinensis roots, the values were 9.7, 12.9, 11.7 pmol/(cm2?s) respectively. However in the mature region it showed efflux, the value was 11.0 pmol/(cm2?s); the NH4+ showed efflux in all rigions were measured, the mean values were 7.3, 36.7, 37.8, 21.7 pmol/(cm2?s) respectively. These results suggested the Tamarix chinensis preferred to take up NO3-. (2) The nitrate could increase the number of Tamarix chinensis roots and the Cistanche tubulosa.