Response and Factors Affecting Tamarix Tolerance to Salinity and the growth of Tamarix in Iran desert

Tamarix (scientific name: Tamarix) is a genus of the Tamarind family. Tamarind is a saltloving tree native to the arid regions of Eurasia and Africa and includes 55 species, of which about 35 species are found in the Middle East and 23 species in Iran. Tamarix is C3 plant. But there is resistant to salt. In this study, 8 field-grown Tamarix plants were irrigated with 3% (180 mM) salt for one month. Measurements of electrical conductivity (EC), physiological parameters such as stomatal conductance, stem length, leaf cover volume, chlorophyll content, and plant growth were performed on salt-treated and control plants. In the species Tamarix, the results showed that the physiological parameters of the plant showed that the plant species grown under sandy soil texture were more affected by salt exposure than the plant grown in loamy texture. Therefore, considering the greater tolerance of Tamarix to salt and/or water stress and the strict environmental regulations, the planting of native Tamarix species remains a preferred plant over non-native Tamarix around the deserts of Semnan province. Also Our results have shown that in general the number of trees planted per hectare varies from 1000 to 2500, but their number will vary greatly depending on the tree species and the type of planting.柽柳属（Tamarix）隶属于柽柳科（Tamaricaceae）。该属植物为耐盐树种，原生分布于欧亚大陆与非洲的干旱区域，共计55个物种，其中约35种分布于中东地区，23种见于伊朗境内。柽柳属于C3植物，却具备盐胁迫耐受性。 本研究选取8株田间栽培的柽柳植株，采用3%（180 mM）浓度的盐水灌溉处理1个月。分别对盐胁迫处理组与对照组植株，测定其电导率（electrical conductivity, EC）、气孔导度、茎长、叶覆盖体积、叶绿素含量等生理参数及植株生长状况。研究结果显示，对于柽柳而言，砂质土壤质地下生长的植株，其生理参数受盐胁迫的影响程度显著高于壤土质地下的植株。因此，考虑到柽柳对盐胁迫与/或水分胁迫的较强耐受性，加之严格的环保法规，在塞姆南省沙漠周边区域，本土柽柳物种的种植仍优于非本土柽柳。 此外，本研究结果表明，通常情况下每公顷种植的柽柳植株数量介于1000至2500株之间，但具体数值会因树种及种植模式的不同而产生较大差异。