流动沙漠腹地柽柳叶片的生长规律

Growth model of Tamarix spp.leaf in the drift desert hinterland

研究极端干旱区植物叶片生长特征对筛选防风固沙植物有重要意义。在塔克拉玛干沙漠腹地塔中植物园柽柳专类园区,选择8种不同柽柳,研究了生长季内叶片生长规律。结果显示:1)柽柳属不同种的单叶表面积增长模型较为类似,总体差异不大,但其增长的规律性极强,以y=ax2+bx-c二项式增长模型为主;2)方差分析发现,不同柽柳种间单叶面积差异极显著(F>F0.01);单叶鲜重和干重的差异亦明显;3)柽柳单叶表面积与其干重存在正相关关系,以y=axb的乘幂关系为主。说明塔中沙漠植物园不同柽柳叶面积增长特征有所不同,防护林和固沙树种选择过程中可优先考虑叶面积增长迅速,生物量积累快的柽柳-长穗柽柳和刚毛柽柳。

It is of great importance to study the characteristics of plant leaf for selecting plants for sand-fixation forest growth in arid area.At Tamarix spp.area in Tazhong botanic garden of Taklimakan desert hinterland,8 species of Tamarix spp.were analyzed for their leaf growth law.The main results are： 1） growth models of different Tamarix spp.are similar,dominated by binomial y=ax2＋bx-b;2） The result of analysis variance shows that there are extremely significant differences of single leaf area,leaf fresh weight and dry weight among 8 kinds of Tamarix spp.（FF0.01）;3） Positive correlation between single leaf area and its dry weight was observed in power relationship,which is mainly expressed by y=axb.Therefore,we should first consider Tamarix spp.with high growth rate such as Tamarix elongata Ledeb.and Tamarix hispida Willd.in select trees for controlling sand and constructing shelter-forest.