生态学杂志2017，Vol.36Issue(7)：1847-1854,8.DOI:10.13292/j.1000-4890.201707.016
Cd胁迫下施N对台湾桤木(Alnus formosana)干物质及N、P、K、Cd积累与分配的影响
Influences of cadmium and nitrogen on the accumulation and distribution of dry matter and N, P, K, Cd in Alnus formosana
摘要
Abstract
A controlled pot-experiment with different treatments of Cd and N concentrations was conducted to investigate the biomass production and accumulation and the distribution of N,P,K and Cd in Alnus formosana.The results indicated that the dry matter accumulation,N,P,K absorption and accumulation in roots,stems and leaves in A.formosana were significantly inhibited under Cd stress without adding N;the N and K contents in roots and leaves were reduced,but there was no significant effect on P content.Under Cd stress,the A.formosana adapted to the Cd stress conditions by increasing proportions of N,P,K and dry matter in roots,reducing their proportions in leaves,and improving N and K use efficiency.The root was the main part of Cd enrichment,whose transfer coefficient ranged between 0.06 and 0.22.Cd stress decreased both transfer coefficient and enrichment coefficient of Cd in A.formosana.N addition increased the contents and accumulations of dry matter and N,K in roots,stems,and leaves of A.formosana under 30 mg · kg-1 Cd stress,alleviated N,K absorption restrictions caused by Cd stress,but had no significant effect on P content and its accumulation.Also,N addition increased the proportion of dry matter in roots and root/shoot ratio,especially under 0.4 g · kg-1 N application.Furthermore,the accumulation and proportion of Cd were increased in stems and leaves and decreased in roots.The Cd transfer factor (TF) and stern/leaf biological enrichment coefficients (BCF) increased,but the root BCF was observably reduced.Overall,N application improved A.formosana's ability to adapt to the environment under Cd stress.关键词
镉胁迫/氮肥/台湾桤木/干物质/养分利用Key words
cadmium stress/nitrogen fertilizer/Alnus formosana/dry matter/nutrient use引用本文复制引用
谭长强,黄志玲,彭玉华,申文辉,郝海坤,曹艳云,刘秀..Cd胁迫下施N对台湾桤木(Alnus formosana)干物质及N、P、K、Cd积累与分配的影响[J].生态学杂志,2017,36(7):1847-1854,8.基金项目
广西优良用材林资源培育重点实验室自主课题(15-A-02-02)、广西科技计划项目(桂科AB16380127)和广西林业科技项目(桂林科字[2016]第8号)资助. （15-A-02-02）
