作　　者： ; ; ; ; ; ; (马建伟）; (杜坤）;

机构地区： 华南农业大学林学院

出　　处： 《西北林学院学报》 2013年第3期1-6,33,共7页

摘　　要： 以江孜沙棘(Hippophae gyantsensis)、锦鸡儿(Caragana sinica)、砂生槐(Sophoramoorcroftiana)、唐古特莸(Caryopteris tangutica)4种青藏高原灌木树种为试材进行干旱胁迫模拟盆栽试验,通过对比干旱胁迫后4种灌木生物量和根系特征值的数量变化差异,对供选树种进行抗旱性能分析与评价。结果表明,锦鸡儿根冠比增加最多(233.43%),而砂生槐则基本保持稳定,江孜沙棘和唐古特莸则呈现不同程度的增加。干旱胁迫后4种灌木微细根根长、表面积、根尖数均呈现不同程度的增加,其中唐古特莸根长增加最大,达112.11%,江孜沙棘次之,锦鸡儿和砂生槐分别增加了38.84%和24.55%;根表面积方面,干旱条件下的苗木比对照增加幅度的大小为:唐古特莸>江孜沙棘>砂生槐>锦鸡儿;根尖数增幅介于45.89%～57.29%之间。干旱胁迫后锦鸡儿微细根表面积、根尖数占全根比例下降,而其他3种灌木根系特征值占全根比例均呈上升趋势。隶属函数值综合评价表明,抗旱性强弱顺序为:唐古特莸>锦鸡儿>江孜沙棘>砂生槐。 Four native shrubs（Hippophae rhamnoides,Caragana sinica,Sophora moorcroftiana,and Caryopteris tangutica） occurring in Tibetan Plateau were selected for potted experiment for simulating drought stress.The drought resistance of the chosen species was analyzed and evaluated through the comparison of the changes of biomass and root characteristics to provide scientific basis for the selection of drought resistant shrub species in the region.The results showed that C.sinica exhibited the largest increment in root shoot ratio（233.43%）,the ratio was stable for S.moorcroftiana,and increased in various degrees for H.rhamnoides and C.tangutica.On the other hand,fine root length,surface area and amount of root tip of 4 shrubs under drought stress increased in different degrees.C.tangutica had a largest increase in root length,reaching to 112.11%,H.rhamnoides was the second,C.sinica and S.moorcroftiana increased by 38.84% and 24.55%,respectively.For the root surface area,compared with seedlings under normal water condition,the amplitude of the increase of 4 species was in the order of C.tanguticaH.rhamnoidesS.moorcroftianaC.sinica.Amounts of root tip increased between 45.89% to 57.29%.C.sinica demonstrated decreases in surface area of fine roots and the proportion of small fine roots to total roots,while other 3 species exhibited increases in the ratio of root eigenvalues to the total roots.Comprehensive evaluation results of subordinate function value showed that the order of drought resistance was C.tanguticaC.sinicaH.rhamnoidesS.moorcroftiana.

关 键 词： 青藏高原 灌木 生物量 根系特征 抗旱性

领　　域： [农业科学]