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风沙流对梭梭冠型特征影响的风洞模拟研究*
孙涛,马剑平,师生波,韩福贵,张裕年,王方琳,万翔,张红媛
1.甘肃省治沙研究所/ 甘肃省荒漠化与风沙灾害防治重点实验室- 省部共建国家重点实验室培育基地;2.中国科学院 西北高原生物研究所
摘要:
为了研究风沙流胁迫环境对梭梭Haloxylon ammodendron 植株冠型特征的影响和适应机制,以2 a 生梭梭为研究对象,在风沙环境风洞中分别模拟5、8、10、13、16 和18 m · s-1 风沙流胁迫环境,定量分析风沙流胁迫对梭梭的生长和冠型特征的影响。结果表明:(1)不同强度风沙流胁迫后,梭梭枝条外表产生的伤害特征表现不一,植株恢复正常生长所需的时间也不同。18 m · s-1 风沙流胁迫20 min 已达到致死风速,梭梭枝条恢复困难,永久死亡。(2)梭梭冠幅和植株体积大小随风沙流胁迫强度的增加呈先升高后降低的趋势。梭梭冠幅和植株体积累计增加量大小排序分别为:轻度风沙流胁迫> 中度风沙流胁迫> 重度风沙流胁迫。(3)梭梭枝条长度、分枝数量和枝条直径大小随风沙流胁迫强度的增加呈二项式曲线变化,新生枝长度累加量呈直线方程快速减少,表明梭梭具有较强的形态可塑性与变异性。
关键词:  风洞模拟  风沙流  胁迫  梭梭  冠型特征
DOI:
分类号:
基金项目:国家自然科学基金(31660237)
Effect on the Phenotype of Haloxylon ammodendron by Wind Sand-blown Stress Simulated in the Wind Tunnel
suntao1
1.Gansu Desert Control Research Institute/State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating,;2.Northwest Institute of Plateau Biology,Chinese Academy of Sciences;3.Gansu Desert Control Research Institute/State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating,Lanzhou,Gansu 730070,China
Abstract:
In order to study the phenotype characteristic and adaptive mechanism of Haloxylon ammodendron in the stress of wind carring-sand environment, 2-years old breedings of H. ammodendron as research objects, 3 gradients of carring-sand environment had been simulated in the wind tunnel, where there were include the mild wind-sand stress environment(5,8 m · s-1), moderate (10,13 m · s-1), severe (16 m · s-1) and extra-severe wind sand-blown environment(18 m · s-1). The results showed that (1)The appearance damage of the branches of H. ammodendron caused by wind sand-blown was different related to the different gradients of wind sand-blown, while, the time required for plants to resume normal growth situation was also different after the wind-blown. The branches of H. ammodendron died permanently after 20 minutes under the extra-severe wind sand-blown of 18 m · s-1, meaning to lethal damage. (2) With the increase of the intensity of the wind sand-blown, the crown width and the plant volume of H. ammodendron increased firstly and then gradually decreased,thesequence of the accumulation of the crown and the plant volume from the high to low was: the mild sand-blown wind> the moderate wind sand-blown>the severe wind sand-blown. (3) With the increase of the intensity of wind carring-sand, the trend of the length,the number of branches and the branch’s diameter of H. ammodendron showed a binomial curve that first increased and then decreased, while,the cumulative growth length of new branches decreased sharply as a linear equation, indicating that H. ammodendron has strong morphological plasticity and variability.
Key words:  wind tunnel simulate  wind sand-blown  stress  Haloxylon ammodendron  phenotype characteristic