养分胁迫对降香黄檀幼苗生长及叶片养分状况的影响  

Effects of nutrient stress on seedling growth and foliar nutrient status of Dalbergia odorifera

作　　者：赵霞[1] 徐大平[1] 杨曾奖[1] 刘小金[1] 张宁南[1] 

机构地区：[1]中国林业科学研究院热带林业研究所,广州510520

出　　处：《生态学杂志》2017年第6期1503-1508,共6页Chinese Journal of Ecology

基　　金：广东省林业科技创新专项资金项目(2013KJCX004-01);中央级公益性科研院所基本科研业务专项资金项目(RITFYWZX201407)资助

摘　　要：设置氮、磷、钾缺乏和过量,钙、镁、硫缺乏以及全素等10个处理,采用砂培法研究大量元素缺失或过量对降香黄檀幼苗生长及叶片养分状况的影响。结果表明:处理约20 d时幼苗叶片开始出现不同症状,其中氮、磷、镁的影响最为明显;养分胁迫显著影响苗木生长,缺磷、磷过量和缺氮的苗高分别比对照下降64.5%、61.6%和56.0%,叶面积下降95.1%、92.8%和76.3%,生物量下降92.1%、93.0%和80.6%。向量分析结果表明,在大量元素缺乏的情况下,叶片营养元素间存在协同或拮抗作用,氮和钙之间具明显的协同作用,而磷过量和钾过量会降低钙的吸收。Major nutritional elements nitrogen （N） , phosphorus （P）, potassium （K）, calcium （ Ca）, magnesium （ Mg）, sulfur （S） were tested with sand culture method for their deficiency or overdose effects on seedling growth and foliar major element composition of Dalbergia odorifera. Specific leaf symptoms were observed in all nutritional stress treatments after 20 days, especially those of N, P and Mg. The nutritional stress had significant effects on seedling growth, with per- centages of decrease being 64.5%, 61.6% and 56.0% in seedling height, 95.1%, 92.8% and 76.3% in leaf area, and 92.1%, 93.0% and 80.6% in biomass caused by P deficiency, P over- dose, and N deficiency, respectively. Vector analyses indicated that deficiency of major nutrition- al elements could lead to synergism or antagonism between foliar major nutrient elements, such as pronounced synergism between Ca and N but antagonism of Ca （reduction） with P and K （over- dose）.

关 键 词：养分胁迫 降香黄檀 幼苗生长 养分状况 

分 类 号：S792.28[农业科学—林木遗传育种]