施肥对盆栽香樟幼苗不同根序细根养分的影响  

Effects of fertilization on nutrient concentrations of different root orders,fine roots in Cinnamomum camphora seedings

作　　者：范川[1] 黄复兴[1] 李晓清[2] 李贤伟[1] 舒翔[1] 李平[1] 

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,成都610081

出　　处：《广西植物》2015年第4期507-514,共8页Guihaia

基　　金：国家林业公益性行业科研专项(201104109);国家"十二五"科技支撑计划项目(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1~5级细根的(C、N、P、K含量,并探讨施肥对香樟幼苗细根养分浓度的影响。结果表明:(1)不同根序细根的全(C浓度差异不显著,施肥对细根全(C浓度影响不显著(P>0.05);(2)在所有根序中,N、P浓度最高的是1级根,但其K浓度却最低;N、P含量最低的是5级根;(3)细根的N、P含量随着根序的增加呈显著的下降趋势(P<0.05);(4)施N肥能显著增加1~2级细根的N含量,施P肥能显著增加1级根的P含量,N+P肥较之P肥更能提高1级根对P的吸收;(5)(C:N:P受根序的影响非常明显,1级根平均为366:16:1,5级根则为807:12:1,而且(C:N:P随着根序增加而显著升高,但N:P无显著影响;(6)虽然施肥对细根(C含量无影响,但施N肥或N+P肥对1~2级细根中N的含量有显著性增加。综合分析可知,处理9对香樟苗期养分浓度指标影响最为显著,即施肥量为氮素4 g·株^(-1)、磷素4 g·株^(-1)、钾素2 g·株^(-1)时,对香樟幼苗细根的生长发育有较好地促进作用。研究结果可为香樟的速生丰产及资源的高效利用提供理论依据。Setting one-yearold potted Cinnmomum ca mphora seedlings as the research object, using exponemial fertiliza- tion method, we detected the first to the fifth order fine roots C, N and P contents, in order to explore the effects of fer- tilization on C. camphora seedlings, and to provide a theoretical basis for C. camphor fast growing and efficient use of resources in nurturing process. The results were as follows： （1） C concentrations of the differences orders＇ fine root were not significant, with the rise of the root order, while C content overall upward trend. Fertilization had no significant effect on the C concentration of fine root（P〉0.05） ; （2） N and P concentrations of first order roots were the maximum, while fifth order roots were the minimum, with the rise of root orders. N and P concentrations significantly decreased （P〈0.05） ; （3） N significantly increased the N content level of the first to the second fine roots, P fertilizer significantly in- creased the P content Of a root, mix of nitrogen and phosphorus fertilizer could improve the root uptake of P; （4） C ： N ： P had a significant difference in different root orders roots;（5） The first order roots＇ mean C ： N ： P was 366 ： 16 ： 1, the fifth order root 807 ： 12 ： 1, with increased root order, C ratio of three kinds of elements increased significant- ly, while the N ： P changed little;（6）Fertilization did not change the proportion of C; however, N fertilizer or mix of nitrogen and phosphorus fertilizer significantly increased the N proportion of the first to second order roots. In conclu- sion： The treatment 9 pairs of C. camphor on seedling stage indicators impact most significantly. A fertilizer with the ni- trogen 4 g · plant^-1 , the phosphorus 4 g· plant^-1 and the potassium 2 g ·plant^-1 , would have significant promote grow- ing for growing and development of fine roots in C. camphor seedlings.

关 键 词：香樟 施肥 细根 根序 

分 类 号：Q945.12[生物学—植物学] S792.23[农业科学—林木遗传育种]