类芦根系对不同强度干旱胁迫的形态学响应.docVIP

 类芦根系对不同强度干旱胁迫的形态学响 应# 蔡丽平1,2,3，吴鹏飞1,2,3，侯晓龙1,2,3，马祥庆1,2,3，张芸1,2** 5 10 15 （1. 福建农林大学林学院，福州 350002； 2. 福建农林大学森林与环境研究所，福州 350002； 3. 福建杉木研究中心， 福州 350002） 摘要：以水土保持先锋植物类芦为研究对象，通过设计 4 个不同干旱强度胁迫的盆栽试验， 测定不同处理中类芦根系形态指标，研究类芦对干旱胁迫的形态学响应。结果表明：不同干 旱强度胁迫处理，类芦根系总长度、表面积、平均直径的差异明显，而根体积差异不大。当 干旱强度达到重度胁迫（田间持水量 20%±5%）时，类芦根体积才明显变小。类芦根系平 均直径对土壤田间持水量的变化反应敏感，充足供水处理中类芦根系平均直径明显大于其它 处理。中度干旱胁迫条件下（田间持水量 40%±5%），类芦的根系长度和表面积明显大于 其它处理。 关键词：干旱胁迫; 类芦; 根系形态; 田间持水量 中图分类号：S157 文献标识码：A Morphological response to soil drought stress in the roots of 20 25 30 35 40 Neyraudia reynaudiana Cai Liping1, Wu Pengfei2, Hou Xiaolong3, Ma Xiangqing1, Zhang Yun1 (1. Forestry College of Fujian Agriculture and Forestry University,Fujian Fuzhou 350002; 2. Insititue of Forestry and Environment ,Fujian Agriculture and Forestry University, Fuzhou 350002; 3. Chinese Fir Research Center of Fujiajn ,Fuzhou 350002) Abstract: Using pioneer species- Neyraudia reynaudiana which extensively distributed in southern China region for water and soil conservation as the research object, pot experiment with four different drought stress was designed, root morphology index was determined in different treatments, and morphological response to drought stress was researched. The results indicated: among treatments with different drought stress, there was obviously different in total length, surface area, average diameter of N. reynaudiana, but not in the root volume. Root volume decreased significantly in heavy drought stress with field moisture capacity by 20%±5%. Average diameter of N. reynaudiana reacted sensitively to changes of field capacity, average diameter in treatment with enough water supply was significantly greater than that in other treatments. In moderate drought stress condition with field moisture capacity by 40%±5%, root length and surface area of N. reynaudiana was significantly greater than other treatments. Key words: Drought stress; Neyraudia reynaudiana; Root morphology; Field moisture capacity 类芦（Neyrau