文献类型：期刊文献

中文题名：盐胁迫对红楠幼苗生长及Na^+、K^+吸收和分布的影响

英文题名：Effects of Salt Stress on Seedling Growth of Machilus thunbergii and Na^+,K^+ Absorption and Distribution

作者：刘军[1] 徐金良[2] 邹军[3] 陈文荣[3] 姜景民[1]

第一作者：刘军

机构：[1]中国林业科学研究院亚热带林业研究所;[2]浙江省开化县林场;[3]福建省国有来舟林业试验场

年份：2013

卷号：26

期号：6

起止页码：790-794

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家林业公益性行业科研专项重大项目(201204307);浙江省林木种苗与花卉产业技术创新战略联盟项目(2010LM202-5)

语种：中文

中文关键词：红楠;盐胁迫;生物量;根系形态;离子吸收

外文关键词：Machilus thunbergii ; salt stress ; biomass ; root morphology; ion absorption

分类号：S722.3

摘要：土壤盐渍化是一个世界性的资源和生态问题，土壤中所含的盐分影响到植物的正常生长。根据联合国教科文组织和粮农组织不完全统计，全世界盐渍土面积为9．5438亿hm2，其中我国为9913万hm2，占全国耕地面积的6．62％，近年来更多的可用耕地受到盐渍化的威胁。
In order to explore the salt tolerance mechanism of Machilus thunbergii, the effects of salt stress on seed- ling biomass, root morphology, sodium and potassium absorption and distribution were studied. The results showed that the above-ground biomass increased slightly under lower salt stress conditions, while the below-ground biomass, root length and root surface area showed a downtrend. The above-ground growth was limited under high concentra- tion salt stress, while the under-ground growth was not subject to significant restrictions. The absorption of Na ~ in root increased under salt stress, but that of K ＋ decreased. The ability of Na ＋ transporting from root to leaf and stem was weakened. The accumulation of Na＋ in stem and leaves was less. With the decreased absorption of K ＋ , the ra- tio of Na＋/K＋ also continuously increased. With the increased concentration of salt stress, the ability of K ＋ absorp- tion in roots increased. The ability of K＋transporting from root to leaf and stem was enhanced, which resulted in significant increase of K ＋ in the leaves and stem. The accumulation of Na ＋ in the under-ground was significantly greater than that in above-ground, while the K＋ content in above-ground increased significantly, which played a key role in maintaining normal growth and metabolism of M. thunbergii.