风沙静电场对植物茎秆液流传输过程影响的理论分析  

A Theoretical Analysis of the Effect of Wind-blown Sand Electrostatic Field on Vegetation Physiological Processes

作　　者：李兴财[1,2,3] 赵宁[1] 

机构地区：[1]宁夏大学物理电气信息学院,宁夏银川750021 [2]宁夏大学宁夏沙漠信息智能感知重点实验室,宁夏银川750021 [3]兰州大学西部灾害与环境力学教育部重点实验室,甘肃兰州730000

出　　处：《中国沙漠》2013年第6期1731-1734,共4页Journal of Desert Research

基　　金：西部灾害与环境力学教育部重点实验室(兰州大学)开放基金;国家自然科学基金项目(11302111);宁夏自然科学基金和宁夏大学联合资助项目(NZ12117);国家科技部国际合作项目(2011DFA11780);宁夏自治区科技支撑计划(宁陕合作)项目资助

摘　　要：风沙流对植物生理过程具有非常重要的影响,但是对其影响机理目前并无相关理论模型给予解释。本文基于植物茎秆的刚性导管模型讨论了风沙静电场对植物茎流速率的影响。结果表明:随着外部电场增强,茎流速率指数增加,即外部电场越强,水分输运速度越快;植物茎秆导管半径越大,水分输运速度越快,且电场的影响越明显。本文结果在一定程度上解释了风沙流胁迫对植物的影响远大于净风影响的实验结果,可为沙化地区的植被保护提供一定的帮助。Windblown sand has an important effect on plant physiological processes, but there is no any the oretical model to explain its mechanism. Based on the rigid conduit model of the plant stem, this paper dis cusses the effect of windsand electrostatic field on the speed of plant sap flow. The numerical result shows that with the increasing of external electric field, the sap flow rate corresponding exponentially increases, accordingly the stronger external electric field, the faster the water transport; with the increasing of con duit radius, the water transport rate increases, and the effect of environment electric field on plant sap flow is more obvious. To some extent, these results can explain why the effect of windblown sand on plant is larger than that of the net wind, and it will provide some helps for the vegetation protection on arid areas.

关 键 词：风沙流 电场 茎流速率 植物生理 

分 类 号：Q945.79[生物学—植物学]