黄土高原不同地区杜松的种子萌发特性及其与生态因子的相关性  

Seed germination performance of Juniperus rigida in different regions of the Loess Plateau and its relation with ecological factors

作　　者：李谭宝[1] 张亚芳[2] 李登武[2,3] 王彩云 

机构地区：[1]国家林业局西北林业调查规划设计院,陕西西安710048 [2]西北农林科技大学林学院,陕西杨凌712100 [3]宁夏贺兰山森林生态定位研究站,宁夏银川750000 [4]吕梁市园林绿化管理处,山西吕梁033000

出　　处：《干旱地区农业研究》2015年第3期139-143,288,共6页Agricultural Research in the Arid Areas

基　　金：中央高校基本科研业务费专项资金项目-科技创新专项(重点项目)(QN2011077)

摘　　要：选取黄土高原5个地区杜松(Juniperus rigida)种子,采用种子萌发实验及相关分析的方法,研究其大小特征、萌发特性及其与生态因子的相关性,以了解不同地区杜松的种子萌发特性。结果表明,不同地区杜松的种子大小差异显著,府谷地区的种子最大、最重,平均长6.83 mm,宽3.56 mm,千粒重为25.89 g;种子长及种子长宽比随纬度的升高、土壤全磷含量的增加而变小;种子千粒重随1月和7月均温的增加而增加,随土壤有机质、速效磷、全氮含量的增加而减少。种子大小对萌发特征影响显著,种子萌发率、萌发势及发芽指数均随种子长、种子长宽比的增加呈减小的趋势。不同地区杜松的萌发差异显著,武川的种子萌发最快最高,府谷与贺兰山最慢、最低;萌发率、萌发势及发芽指数均随纬度的升高而增加,萌发势和发芽指数随土壤全磷含量的增加而增加。研究认为武川及浑源地区是杜松优良的选种地。In the present study ,the biological characteristics of seed germination were investigated for five typical populations of Juniperus rigida growing in different regions of the Loess Plateau ,and their relation with climatic and soil factors were studied .The results showed significant difference in seed size among the five regions ,with Wuchuan being the smallest with respect to seed length （6 .83 mm ） ,width （3 .56 mm ） ,and seed weight （25 .89 g ） .Seed length and ratio of length/width decreased as latitude and soil total phosphorus content increased .Seed weight increased with in-creased mean temperature in January and July ,but decreased with increased organic matter ,available phosphorus and to-tal nitrogen of soil .There was a significantly negative correlation between germination and seed size .Seed germination differed among regions ,with Wuchuan region being the fastest and highest whereas Fugu the slowest and lowest .Germi-nation rate ,germination energy and germination index increased with latitude .Additionally ,Wuchuan and Hunyuan are suitable for growing Juniperus rigida .

关 键 词：杜松 种子萌发 地区差异 生态因子 黄土高原 

分 类 号：S791.450.2[农业科学—林木遗传育种]