摘要
为探究施肥对美国山核桃(Carya illinoensis)幼苗生长和氮素积累的影响,以一年生美国山核桃实生苗为试验材料,共设置0(CK)、100、200、400、600和800 mg·株^(-1)6个供氮水平,运用指数施肥法研究了6个供氮水平处理下美国山核桃生物量和氮积累的变化。结果表明:美国山核桃幼苗茎生物量、叶生物量和总生物量均随施氮量的增加而呈现先增后减的趋势,均在600 mg·株^(-1)达到最大值,分别为2.30、4.39和9.33 g,是CK组的2.30、4.99和2.17倍,而根生物量随着施氮量的增加呈现递减的趋势;与CK组相比,各指数施肥处理的美国山核桃幼苗根、茎、叶氮质量分数分别提高了0.79~6.40、1.01~3.52和0.43~1.03倍,而根、茎、叶氮积累量分别提高了1.84~6.66、2.40~9.35和4.02~8.23倍;当施氮量为≤600 mg·株^(-1)时,美国山核桃幼苗的总生物量和总氮累积量均随施氮量的增加而增加,而当施氮量达到800 mg·株^(-1)时,其幼苗的总生物量和总氮累积量出现明显下降,总氮质量分数始终保持上升趋势。因此,施氮量600 mg·株^(-1)左右为美国山核桃幼苗温室培育的最适施氮量。
An exponential fertilization experiment was conducted with six N application levels( 0( CK),100,200,400,600,800 mg·seedling^-1) to examine the effects of N application levels on the growth and N accumulation of pecan( Carya illinoensis) seedlings. The objective of this study was to reveal the N demand and determine the optimal N application amount for pecan seedlings. Results showed that the stem biomass,leaf biomass,and total biomass of pecan seedlings increased as fertilization levels increased from 0 to 600 mg·seedling^-1 and then decreased with the levels increased from 600 to 800 mg ·seedling^-1. The maximum values of these three variables were 2.30,4.39 and 9.33 g·seedling^-1,being 2.30,4.99 and 2.17 times as high as that of the CK respectively. Root biomass decreased with the increases of N supply. For exponential fertilization treatments,the N concentration increased by 79%-640% in roots,101%-352%in stems,and 43%^-103% in leaves with N content increasing 184%-666% in roots,240%-935% in stems,and 402%-823% in leaves. The N content and total biomass of pecan seedlings increased as the N fertilization increased from 0 to 600 mg·seedling^-1 and then decreased with the fertilization levels from 600 to 800 mg·seedling^-1. The N concentration of pecan seedlings increased with the increases of N supply. We concluded that 600 mg·seedling^-1 would be the optimal N application level for pecan seedlings in greenhouse.
作者
王益明
李瑞瑞
张慧
鞠昌华
裴文明
胡菲
万福绪
WANG Yi-ming;LI Rui-rui;ZHANG Hui;JU Chang-hua;PEI Wen-ming;HU Fei;WAN Fu-xu(Co-Innovation Centre for Sustainable Forestry in Southern China,Col-lege of Forestry,Nanjing Forestry University,Nanfing 210037,China;Nanjing Institute of Envi-ronmental Sciences,Ministry of Ecology and Environment,Nanjing 210042,China).)
出处
《生态学杂志》
CAS
CSCD
北大核心
2018年第10期2920-2926,共7页
Chinese Journal of Ecology
基金
江苏省林业三新工程(LYSX[2015]20)
江苏省高校优势学科建设工程项目(PAPD)资助
关键词
美国山核桃
指数施肥
氮素
生物量分配
pecan
exponential fertilization
nitrogen
biomass allocation.