Comparison of root architecture characteristics of Salsola collina in the southeast edge of Tengger Desert
Root architecture reflects the absorptive capacity and utilization of plant resources,and is an impor-tant aspect to reveal the mechanism of vegetation regeneration,growth and adaptation in sandy land.In this study,Salsola collina under different surface conditions(quicksand,algal crusts(semi fixed sand),moss crusts(fixed sand))in the southeast edge of Tengger Desert was selected as the research object.The traditional mining method was used to collect plant roots.Based on the quantitative root morphology index,the geometric topology and fractal theory were used to analyze the root configuration characteristics,The effects of land surface evolu-tion on the root architecture of Salsola collina and its adaptation mechanism were discussed.The results showed that the ratio of root depth to width,the ratio of root to shoot,the specific root length and the specific surface ar-ea of Salsola collina decreased significantly from quicksand,algae crusts to moss crusts,while the horizontal range of root system increased significantly;The root topological index TI was 0.8125(quicksand),0.7107(al-gal crusts),0.6313(moss crusts),which decreased gradually,and the root structure tended to change from fish-tail branching structure to fork branching structure;The fractal dimension of roots increased significantly,but the fractal abundance of roots decreased significantly.In a word,with the increase of sand fixation degree and the evolution of surface crusting and covering conditions,the investment in root growth of Salsola collina de-creased,and the spatial expansion ability degenerated.At the same time,the overall structure of the root system was further complicated.The root growth strategy changed from quantity to quality,and the resource utilization strategy changed to high competitiveness.This study can provide reference for vegetation restoration,species se-lection and allocation in desert areas.
NETL
NSTL
万方数据
