摘要
以2.5 a幼龄橡胶树为研究对象,借助于15N示踪技术研究了生物炭添加(0、30、60 t·hm^(-2))对橡胶树幼苗氨态氮(NH_4^+)、硝态氮(NO_3^-)和甘氨酸氮的吸收速率的影响。结果表明:无论生物炭添加与否,幼龄橡胶树均以NH_4^+作为主要氮源。生物炭添加未显著改变橡胶树幼苗对土壤中优势氮(NH_4^+)的吸收速率,但显著改变了其对土壤中两种非优势氮素的吸收速率,且高低剂量添加下的影响效果有所不同。低剂量的生物炭添加能大幅度促进橡胶树对NO_3^-的吸收速率((4.77±1.14)μg·g^(-1)·h^(-1)),而高剂量的生物炭添加则大幅度促进了橡胶树对甘氨酸氮的吸收速率((3.15±0.58)μg·g^(-1)·h^(-1))。从而表明,低剂量与高剂量生物炭添加对橡胶树氮吸收速率的影响存在明显差异。从环境保护的角度来讲,低剂量的生物炭添加比高剂量的生物炭添加更有助于提高橡胶树对NO_3^-的吸收利用水平,从而减少因NO_3^-淋溶而造成的环境污染风险。
15 N-labeling approach was used to investigate theeffects of biochar addition(0,30 and 60 t·hm-2)on the uptake of ammonium(NH+4),nitrate(NO-3)and glycine by young rubber trees(Heveabrasiliensis).The young rubber trees took up NH+4 as the dominant N form whether biochar was added or not.Biochar addition didnot change the uptake of the dominant N form(NH+4)by rubber trees but changed the uptake of two subdominant N forms(i.e.NO-3 and glycine-N).Low biochar addition strongly increased the uptake of NO-3(4.77±1.14μg·g-1·h-1)while high biochar addition greatly increased the uptake of glycine-N(3.15±0.58μg·g-1·h-1).Therefore,the biochar addition could alter the N uptake patterns of rubber trees.From the view of environment protection,low biochar addition can better increase the uptake of NO-3 and decrease the risk of environmental pollution than high biochar addition.
作者
崔莹光
徐凡珍
刘敏
徐兴良
Cui Yingguang;Xu Fanzhen;Liu Min;Xu Xingliang(NO.2 Middle School of Binzhou,Binzhou 256600,P.R.China;Laibin Academy of Agricultural Science;Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2018年第11期41-44,50,共5页
Journal of Northeast Forestry University
基金
国家自然科学基金项目(31470560
41601318)
作者简介
崔莹光,男,1972年11月生,滨州市第二中学,高级教师。E-mail:bzezcyg@163.com;通信作者:徐兴良,中国科学院地理科学与资源研究所,研究员。E-mail:xuxingl@hotmail.com。
