邻株低磷竞争处理对杉木幼苗生长的影响  

Effect of Competition for Low Phosphorus on Growth of Chinese Fir Seedlings

作　　者：李琦[1,2] 吴鹏飞[1,2] 陈智裕 邹显花[1,2] 

机构地区：[1]福建农林大学林学院,福建福州350002 [2]国家林业局杉木工程技术研究中心,福建福州350002

出　　处：《信阳师范学院学报（自然科学版）》2014年第3期351-354,共4页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(31100472);教育部高校博士学科专项基金项目(20103515120004);福建省科技重大专项项目(2012NZ0001)

摘　　要：以南方林区广泛种植杉木无性系为研究对象,利用室内沙培模拟装置,设置缺磷(0 mg/kg KH2PO4)、低磷(6 mg/kg KH2PO4)和正常供磷(12 mg/kg KH2PO4)3个供磷水平,构建邻株磷竞争环境.结果表明:邻株低磷竞争处理可明显促进杉木苗高生长,但竞争条件下,缺磷处理抑制杉木苗高生长.不同邻株磷竞争处理条件下杉木地径生长差异未达显著水平.在邻株低磷竞争处理条件下杉木根系长度、表面积、直径、体积等形态指标增量最大.Objected with Chinese fir planted widely in South China recently, using the sand-culture indoor simula- tion pots supplying with three different P levels, which were 0 mg/kg, 6 mg/kg and 12 mg/kg of KH2 PO4 respectively, a competition between neighbor trees environment for P was constructed. Main results were as follows. The treatment of competition for low P could obviously promote the height growth of seedlings of Chinese fir, but P deficiency under competition stress inhibited the growth. Effects of all treatments with different supplying P levels and whether competition or not on root collar diameter growth of Chinese fir were not significant, but the synergistic effect on the ground di-meter growth had a certain influence. Increments of all the roots morphological indexes, including length, surface area, diameter and volume, were large under competition for low P.

关 键 词：杉木 低磷胁迫 邻株竞争 根系生长 

分 类 号：S722.5[农业科学—林木遗传育种]