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土壤干旱对黄土高原4个乡土树种生长及干物质分配的影响 预览 被引量:8

Effect of soil drought on seedling growth and dry matter allocation of four native tree species on Loess Plateau
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摘要 研究了不同土壤水分条件对黄土高原4个乡土树种幼苗生长及干物质分配的影响.结果表明,中度干旱(50%~55%θf)下虎榛子(Ostryopsis davidiana Decne.)和白刺花(Sophora viciifolin Hance)的生物量比适宜水分下(70%~75%θf)增加20.23%和3.93%,而大叶细裂槭(Acer stenolobum Rehd.var.megalophyllum Fang et Wu)和辽东栎(Quercus liaotungensis Koidz.)生物量分别降低13.59%和35.25%;重度干旱(40%~45%θf)对幼苗生长均有明显抑制作用.白刺花地上部与地下部的生长受水分胁迫影响较小,较其他树种具有更强的耐旱性;干旱对辽东栎地上部生长的影响较地下部大,重度干旱下其生长明显受抑制.随干旱程度加剧幼苗的根冠比增大,在重度干旱下大叶细裂槭根冠比达2以上.虎榛子整体生长速度较慢,对干旱的适应可能更多表现在生理上的耐旱. Effects of different soil water contents on growth and dry matter allocation of four native tree species seedling on Loess Plateau were studied. The results showed that seedlings of Ostryopsis davidiana Decne. and Sophora viciifolin Hance had higher biomass under medium drought (50%-55% θ_f)) than that of under normal water (70%-75% θ_f)) , increasing 20.23% and 3.93% respectively, Quercus liaotungensis Koidz. and Acer stenolobum Rehd. var. megalophyllum Fang et Wu were on the contrary and their biomass decreased 13.59% and 35.25% respectively. The growth of four tree species seedlings had been inhibited significantly under severe drought (40%-45% θ_f)). The growth of above- and under-ground parts of S. viciifolin was decreased slightly, it had the strongest drought resistance than other tree species. The growth of above-ground part of Q. liaotungensis was decreased higher than that of under-ground part under soil drought and its growth was significantly decreased under severe drought. Root-shoot ratio of seedling had increased with descending soil water content and root-shoot ratio of A. stenolobum var. megalophyllum added up to 2 under severe drought. The growth speed of O. davidiana is slow and it probablely has more physiological drought resistance to adapt stress condition.
作者 王海珍 梁宗锁 韩蕊莲 韩路 WANG Hai-zhen~(1,2), LIANG Zong-suo~(1,①), HAN Rui-lian~1, HAN Lu~2 (1. Institute of Soil and Water Conservation, the Chinese Academy of Sciences and Ministry of Water Resources, College of Life Science of Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China; 2. Institute of Plant Science and Technology of Tarim University, Alar 843300, China),
出处 《植物资源与环境学报》 CAS CSCD 2005年第1期 10-15,共6页 Journal of Plant Resources and Environment
基金 中国科学院"西部之光"人才培养计划,中国科学院知识创新工程项目
关键词 乡土树种 土壤水分 幼苗生长 干物质分配 黄土高原 干旱 native tree species soil drought growth dry matter allocation
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