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• W2313637037 abstract "PDF HTML阅读 XML下载 导出引用 引用提醒 模拟长期大风对木本猪毛菜表观特征的影响 DOI: 10.5846/stxb201201160099 作者: 作者单位: 新疆师范大学,新疆师范大学 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目(30960086, 31260101);新疆师范大学研究生科技创新基金项目(20111212);新疆师范大学珍稀濒危物种保护生物学重点实验室 The effect of simulated chronic high wind on the phenotype of Salsola arbuscula Author: Affiliation: Xinjiang Normal University,Xinjiang Normal University Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:风是一个重要的生态因子,对植物地上部分的生长和构型有重要影响。植物表观特征对植物获取光能、抵抗外界机械压力有着重要作用。木本猪毛菜(Salsola arbuscula Pall.)是新疆达坂城大风区植被的共建种,也是该区植被恢复潜在的先锋植物。为了研究木本猪毛菜在长期大风环境中形成的独特适应机制,以盆栽实验为手段,设置3个风速(小风:3 m/s,中风:7 m/s,大风:12 m/s),持续吹风105d,定量分析长期大风作用下木本猪毛菜地上部分的生长和空间构型的变化。结果表明:(1)风胁迫减小了木本猪毛菜的株高,增大了其顺风向的基径;大风减小了木本猪毛菜的叶片长度,中风和小风对其叶片长度没有影响;大风和中风增加了木本猪毛菜的叶片数,小风对叶片数没有影响。(2)木本猪毛菜植冠的空间构型在迎风面和背风面出现明显的不对称性;风胁迫减小了木本猪毛菜的主茎弯曲角度、叶倾角;大风和小风减小了木本猪毛菜的冠幅,中风没有影响;大风和中风减小了木本猪毛菜的枝倾角,小风没有影响;木本猪毛菜在大风和中风作用下出现了二级分枝,在小风作用下没有出现二级分枝。木本猪毛菜主要通过减小自身的扩大生长,增加空间构型的不对称性,减小枝与叶的受力面积等方式来降低风的阻力,以适应长期大风。 Abstract:Wind is an important ecological factor, seriously influencing the aboveground growth and architecture of the plant. The plant can adjust the aboveground architecture to change the capture of light and to regulate the resistance to the external mechanical pressure. Salsola arbuscula,one of native shrubs in Dabancheng, grows in the habitat with strong wind and drought. However, its resistance capacity to wind has not been assessed. We investigated the phenotype of S. arbuscula under chronic strong wind to know how S. arbuscula responds to wind disturbance in growth and architecture.Wind generators and pots were used to simulate, lasting for 105 days. The wind generators operated for 6 hours each day from 14:00 to 20:00.Four treatments in wind speeds 0.3(control), 3, 7, 12 m/s were designed. Strong wind led to asymmetrical canopies and basal stem the diameter along the wind direction was significantly thicker than that perpendicular to wind direction. In the wind speeds of 3, 7, 12m/s, the height of S. arbuscula was reduced by 31%, 45% and 72% respectively. The trunk angle to horizon was reduced by 49%, 69% and 80%respectively. the leaf angle to trunk in the windward sector was reduced by 32%, 39% and 47%respectively; and that in the leeward sector was by 36%, 67% and 68%respectively.But the leaf angle to trunk perpendicular to the wind in the west was decreased by 44%, 50% and 59%respectively; that in the east was by 53%, 59% and 62%respectively. S. arbuscula had the second order branch, and the branch angle to trunk was reduced by 24% and 40%, while the number of leave was increased by 54% and 31% under the wind speeds of 7 and 12m/s, respectively. In the wind speeds of 3, 12m/s, the crown area of S. arbuscula was reduced by 54% and 68%, respectively. However, in the wind speed of 12m/s, the leaf length of S. arbuscula in the windward and leeward sector and perpendicular to the wind(west and east) were reduced 39%, 38%, 40% and 36%, respectively. But the total branch number, number of the first order branch, trunk length, average branch length and length of the first order branch of S. arbuscula were not significantly changed with wind load, compared with control plants.It is indicated that S. arbuscula has the capacity to significantly reduce its exposed surface area and the aerodynamic drag in response to chronic high wind disturbance, by reconfiguring the non-uniform canopy architecture to present a streamlined shape to adapt the prevailing wind, and decreasing the angle of the primary branches and leaves. 参考文献 相似文献 引证文献" @default.
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• W2313637037 title "The effect of simulated chronic high wind on the phenotype ofSalsola arbuscula" @default.
• W2313637037 doi "https://doi.org/10.5846/stxb201201160099" @default.
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