钾对黑木相思苗木生长、根系形态的影响  

Effects of Potassium on Seedling Growth and Root Morphology of Acacia melanoxylon

作　　者：陈利娜[1,2] 裘珍飞[3] 丁晓纲[2] 张方秋[2] 李吉跃[1] 何茜[1] 杨海燕[2] 

机构地区：[1]华南农业大学林学与风景园林学院,广州510642 [2]广东省林业科学研究院,广州510520 [3]中国林业科学研究院热带林业研究所,广州510520

出　　处：《中国农学通报》2016年第22期5-9,共5页Chinese Agricultural Science Bulletin

基　　金：广东省教育部产学研结合项目"相思优良无性系规模化扩繁研究与示范"(2009B090300294)

摘　　要：旨在探求黑木相思苗木对K肥的响应机制,进而为黑木相思苗木培育提供理论依据。采用随机区组设计施钾肥方法,进行了7种浓度处理。试验结果显示150~200 mg/株为最佳施钾范围,K-200与K-150处理,苗木生长、根长处于较高的水平,并与对照和其他处理差异明显,其中K-150处理效果尤佳。试验结束时,K-150处理地径和苗高分别为2.07 mm、35.4 cm,地下部分（根）和地上部分（茎叶）生物量分别为0.19 g、1.14 g,分别较对照增加了27%,33%,90%和97%;根长为380.10 cm,较对照增加了60.3%。试验说明适量的K肥能促进黑木相思苗木生长,但施钾量过高（K-300）或者过低（K-50）都对根系生长促进作用不大,施钾量过高甚至于会阻碍根系生长,进而影响苗木生长。The study aims to explore the response mechanism of Acacia melanoxylon seedling to K fertilizers,and provide a theoretical basis for Acacia melanoxylon seedling cultivation. A randomized block design wasused to set potassium fertilizer application. Treatments with seven different concentrations were carried out.The results showed that the best fertilization range was 150-200 mg/seedling, and the effect of both treatmentK- 200 and K- 150 were significantly different from other treatments. At the end of the trial, the grounddiameter and seedling height of treatment K- 150 were 2.07 mm and 35.4 cm, while the underground andabove-ground biomass were 0.19 g and 1.14 g, which increased by 27%, 33%, 90% and 97% respectivelycompared with the control. The root length was 380.10 cm, which increased by 60.3% compared with thecontrol. The trial indicated that suitable potassium fertilizer application could promote the growth of Acacia melanoxylon seedling. However, if the application amount was too high（K-300） or too low（K-50）, it wouldeven damage the plant＇s root system and affect plant＇s growth.

关 键 词：黑木相思 钾肥 苗木生长 根系形态 

分 类 号：S731.2[农业科学—林学]