华北4产地黄栌幼苗根系形态对干旱胁迫的短期响应  

Short-term responses of root morphology to drought stress of Cotinus coggygria seedlings from four varied locations in northern China

作　　者：李金航[1] 齐秀慧[1] 徐程扬[1] 王毅梅 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,干旱,半干旱地区森林培育和森林生态系统国家林业局重点实验室 [2]吉林省林业调查规划设计院

出　　处：《北京林业大学学报》2014年第1期48-54,共7页Journal of Beijing Forestry University

基　　金："十二五"国家科技支撑计划项目(2011BAD38B0303)

摘　　要：以北京西山、北京延庆、山东泰山和山西绛县4个产地的黄栌幼苗为材料，研究了田间模拟试验条件下苗木根系对土壤水分胁迫的短期形态响应。结果表明：1）黄栌幼苗通过调整根系形态以适应持续干旱环境，持续重度胁迫环境中生长的幼苗根尖数量、根系分枝数量、根系表面积以及平均根系直径分别比对照平均高46．5％、15．5％、3．4％、8．6％，且分别比持续中度胁迫环境中生长的幼苗平均高90．5％、34．2％、15．6％、18．4％。2）4产地持续干旱环境中幼苗的0．0～0．5mm根系长度和根尖数量分别占总量的54．7％～93．5％和95．1％～99．5％，因此，0．0—0．5mm细根对干旱胁迫的反应比其他径级根系更为敏感。3）恢复灌溉后，不同产地黄栌幼苗根系生长的恢复能力存在明显差异。山西绛县幼苗根系生物量的相对生长量在中度胁迫复水后分别是北京西山和北京延庆幼苗的29．0和48．6倍，在重度胁迫后恢复灌溉则比北京西山幼苗高280％，因而表现出极强的敏感性和生长恢复能力。Short-term responses of root morphology to soil drought stress in Cotinus coggyria seedlings gathered from four locations in northern China （Xishan Mountain and Yanqing County in Beijing, Taishan Mountain in Shandong Province and Jiangxian County in Shanxi Province） were studied in the field. The results indicated that： 1 ） C. coggyria seedlings adapted to continuous drought stress by altering their root morphology. The root tip number, root fork number, root surface area and average root diameter of C. coggyria seedlings treated with severe stress were higher than those of control by 46.5% , 15.5% , 3.4% , 8.6% , respectively, and they were also higher than those of seedlings continuously treated with moderate stress by 90.5% , 34.2% , 15.6% , 18.4% , respectively. 2） Fine roots at a diameter of 0.0 -0.5 mm were more sensitive to soil water stress than any other sizes of roots, presented as the length and tip number of fine roots increased, accounting for 54.7% -93.5% and 95.1% -99.5% of total root during continuous drought stress treatments. 3） The recovery growth of roots after restoring irrigation in seedlings from four different locations was remarkably different. The relative root biomass of seedlings from Jiangxian County of Shanxi Province subjecting to the moderate drought stress treatment and then restoring irrigation was 29.0 and 48.6 times of those of seedlings from Xishan Mountain and Yanqing County of Beijing, and it was 280% higher than that of seedlings from Xishan Mountain of Beijing when subjecting to severe drought stress and then restoring irrigation. Thus, the seedlings from Jiangxian County of Shanxi Province are more sensitive to soil drought stress, but they have stronger recovery ability after restoring irrigation than others.

关 键 词：黄栌 根系形态 干旱胁迫 恢复灌溉 华北 

分 类 号：S687[农业科学—观赏园艺]