施肥对盆栽香樟幼苗细根生长的影响  

Effects of Fertilization on the Fine Root Growing of Cinnamomum camphora seedings

作　　者：黄复兴[1] 范川[1] 李晓清[2] 李贤伟[1] 张炜[2] 舒翔[1] 徐玲玲[1] 王杰 

机构地区：[1]四川农业大学林学院,长江上游林业生态工程四川省重点实验室,四川雅安625014 [2]四川省林业科学研究院,四川成都610081

出　　处：《西北林学院学报》2013年第5期103-108,114,共7页Journal of Northwest Forestry University

基　　金：林业公益性行业科研专项(201104109);国家“十二五”科技支撑项目(2011BAC09B05)

摘　　要：以盆栽的1年生香樟实生苗为研究对象,采用指数施肥的方式,测定了细根平均直径、平均根长以及比根长3个指标。探讨施肥对香樟幼苗细根形态的影响,为香樟的速生丰产及培育过程中资源的高效利用提供理论依据。结果表明:1)氮磷钾对细根直径影响程度依次为氮>磷>钾,氮素显著提高了1～2级根的平均直径(p<0.05)。2)氮肥能促进了香樟1～2级根的平均根长的增加。适宜浓度的氮磷钾混合肥能显著促进1级细根伸长(p>0.05)。3)氮肥对1～2级根的比根长的增加有显著作用(p<0.05)、施肥对3级以上细根的比根长无显著影响(p>0.05)。综合分析得出:处理9对香樟苗期根系形态指标影响最为显著,即施肥量为氮素4g·株-1、磷素4g·株-1、钾素2g·株-1时,对香樟幼苗细根的生长发育有较好的促进作用。Effects of fertilization on the growth of the fine roots of camphor seedlings were investigated by using 1-year-old potted camphor seedlings and adopting exponential fertilization method. Three root indices, such as the average diameter, average length and specific length were measured. 1）The degree of in-fluence of the three main nutrients on fine root diameter was NPK. Nitrogen significantly （p〈0.05） improved the average diameter of the roots with the 1t-2nd order. 2）Nitrogen fertilizer promoted the aver- age length of the roots with the 1st-2na order. The proper proportion of N, P, K mixed fertilizers could sig- nificantly （p〉0.05） promote the elongation of the roots with 1s order. 3）Nitrogen fertilizer could signifi cantly （p〈0.05） promote the specific length of the roots with the l--2nd order, while no significant in- fluence on the roots with the 3ra or high order. It was concluded that the optimal fertilization amounts on one seedling were 4 g nitrogen, 4 g phosphorus, and 2 g potassium.

关 键 词：香樟 施肥 细根直径 细根根长 细根比根长 

分 类 号：S792.230.4[农业科学—林木遗传育种]