文献类型：期刊文献

中文题名：形态变化对叶片表面温度的影响

英文题名：Effects of leaf shape plasticity on leaf surface temperature

作者：李永华[1,2,3] 李臻[4] 辛智鸣[4] 刘明虎[4] 李艳丽[1,2,3] 郝玉光[4]

第一作者：李永华

机构：[1]中国林业科学研究院荒漠化研究所;[2]国家林业局库姆塔格荒漠生态系统定位研究站;[3]国家林业局敦煌漠生态系统定位研究站;[4]中国林业科学研究院沙漠林业实验中心

年份：2018

卷号：42

期号：2

起止页码：202-208

中文期刊名：植物生态学报

外文期刊名：Chinese Journal of Plant Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：中国林业科学研究院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2016MA012);国家自然科学基金(41671049和31200536)~~;

语种：中文

中文关键词：叶片形态;叶片温度;热成像;叶片边界层阻力

外文关键词：leaf shape; leaf temperature; infrared thermal imaging; leaf boundary layer resistance

分类号：Q945.11

摘要：干旱区植物叶片形态可塑性是植物适应高温干旱环境的重要生存策略,但目前仍缺乏直观的数据予以证明。该研究应用热成像技术和图像分析技术,同步测定真实叶片与模拟叶片的叶温、形态及风速、辐射和温度等环境参数。研究结果显示:在干旱、高温环境下,除了蒸腾,叶片形态变化也是调控叶温的重要因子。干旱区植物叶片变小,有利于加速叶片与环境的物质及热量交换,从而达到降低叶温的目的。样地数据显示,在高温、低风速环境下,叶片宽度每减少1 cm,叶片表面温度降低约2.1℃,而模拟叶片叶宽度每减少1 cm,叶片表面温度降低0.60–0.86℃。该研究对深入理解植物生存策略与环境适能力具有重要意义。
Aims The shape plasticity of plant leaves is an important survival strategy to high temperature and drought in arid region, yet reliable evidences are insufficient to validate the fundamental concepts. Our objective was to demonstrate the specific effects of leaf morphology on leaf surface temperature. Methods Infrared thermal images were processed to determine the leaf temperature and shape parameters of simulated and actual leaf shape. Microclimatic conditions were recorded using a automatic weather station near the sampling plot, including wind speed, radiation and air temperature. Important findings Under the drought and high temperature, the plasticity of leaf shape appeared an important measure to regulate leaf temperature, except leaf transpiration. The exchange rates of matter and energy between leaves and the environment were enhanced by smaller leaves that effectively decreased leaf temperature. With low wind speed and high temperature, leaf surface temperature decreased 2.1 °C per 1 cm reduction in leaf width. However, leaf surface temperature of a simulated leaf decreased 0.60-0.86 °C per 1 cm reduction in leaf width. Results from this study will help us to understand plant adaptability and survival strategy in arid region.