Response of Root Morphology and Water Use Efficiency of Reaumuria soongorica to Soil Water Change
Reaumuria soongorica population is facing a serious degradation at arid and semi-arid region of Northwest.Deficient water conditions impose restrictions on seedling establishment and survival of R.soongorica.In order to study root morphology and water use efficiency of R.soongorica seedlings to provide suggestions for rehabilitating degraded ecosystem,we studied the root morphology and water use efficiency of R.soongorica seedling under different water conditions (full irrigation,FI; moderate irrigation,MI;drought treatment,DT) by pot experiment.The results showed that:(1)R.soongorica seedling root morphology demonstrated great variations under different water gradient and root order.With the decrease of irrigation amounts,R.soongorica root diameter and root volume were FI＞MI＞DT,but drought treatment promoted the elongation growth of root and increased its specific surface area and specific root length,which indicated that R.soongorica seedling through the changes of morphological characteristics such as root elongation growth,root surface area increase,root volume and root diameter decrease to adapt to drought stress.(2)With increasing of root orders,the root length and specific root length significantly decreased in different soil water conditions.However,the root with higher order had greater root diameter and volume,these phenomena indicated the highly morphological variation of fine root system of R.soongorica.(3)Compared with full irrigation,moderate irrigation and drought treatment made the total root biomass and lateral root biomass of R.soongorica seedling increased 50.00％ and 19.23％,respectively.However,the above ground growths of R.soongorica were depressed with the decrease of soil water,especially the leaves biomass reduced at maximum,which decreased 62.15％ and 83.28 ％,respectively,which resulted in the root shoot ratio increased with the reduced of irrigation amounts.(4)Drought treatment significantly increased the R.soongorica seedling water use efficiency.We conclude that R.soongorica seedling through the changes of morphological characteristics such as root length,root surface area and volume,and diameter to optimize the spatial distribution of configurations in order to adjust the plant to improve water use efficiency.
Reaumuria soongoricaroot lengthroot surface areaspecific root length(SRL)specific root surface area (SRA)root biomasswater use efficiency
单立山、李毅、段雅楠、耿东梅、李真银、张荣、段桂芳、Жигунов Анатолий Васильевич
NETL
NSTL
万方数据
维普
