石羊河下游红砂天然更新特征  

Study on Natural Regeneration Feature of Reaumuria songarica in the Lower Reaches of Shiyanghe

作　　者：刘永刚[1] 许丽[1] 王菊莲 方青[1] 王海燕 李玉成 魏林生 石光明 LIU Yonggang;XU Li;WANG Julian;FANG Qing;WANG Haiyan;LI Yucheng;WEI Linsheng;SHI Guangming(Shiyanghe Forestry Center of Wuwei City,Minqin Gansu 733399,China)

机构地区：[1]甘肃省武威市石羊河林业总场,甘肃民勤733399

出　　处：《甘肃林业科技》2022年第1期18-21,共4页Journal of Gansu Forestry Science and Technology

基　　金：甘肃省林草局2020年自列科技项目“石羊河下游不同立地条件红砂种群天然更新与人工促进更新技术研究”(2020kj016)。

摘　　要：红砂是石羊河下游荒漠灌丛植被的主要优势种和建群种。为了研究红砂天然更新能力,在石羊河下游选择8个样地,观察红砂更新幼苗密度、次年存活率、高生长等指标。结果表明:红砂种子发芽成苗随立地条件变化最为剧烈,幼苗存活和苗高生长随立地条件变化较平缓。地理坐标、海拔,以及土壤全氮、速效磷、有机质含量与红砂种子发芽成苗、幼苗存活、幼苗高生长关联不明显。地势平坦,土壤保水性能强有利于红砂种子发芽成苗及幼苗存活,反之则不利,盐碱过重则限制红砂种子发芽成苗,沙丘大保水性差严重抵制幼苗存活。黏性土壤有利于红砂更新及幼苗高生长,沙性土壤不利于红砂更新及幼苗高生长。Reaumuria songarica is the dominant and constructive species of desert shrub vegetation in the lower reaches of Shiyanghe.In order to study the natural regeneration ability of Reaumuria songarica,8 sample plots were selected in the lower reaches of Shiyanghe to observe the regeneration seedling density,survival rate and high growth of Reaumuria songarica.The results showed that the germination and seedling growth of Reaumuria songarica changed most rapidly with the site conditions,but the seedling survival and seedling height growth changed slowly with the site conditions.Geographical coordinates,altitude,soil total nitrogen,available phosphorus and organic matter contents were not significantly correlated with seed germination,seedling survival and seedling height growth of Reaumuria songarica.Flat terrain and strong soil water retention are favorable for seed germination and seedling survival of Reaumuria songarica,whereas unfavorable for seed germination and seedling survival on arid sand.Excessive salt and alkali limit seed germination and seedling survival of arid sand.Cohesive soil is favorable for Reaumuria songarica regeneration and seedling height growth,while sandy soil is unfavorable for Reaumuria songarica regeneration and seedling height growth.

关 键 词：石羊河下游 立地 红砂 更新 

分 类 号：S793.902[农业科学—林木遗传育种]