翅碱蓬生态化学计量内稳性对模拟氮磷沉降的响应  

Response of Stoichiometric Homeostasis and Allometric Scaling in Halophyte Suaeda heteroptera Kitag. to Simulated Nitrogen and Phosphorus Deposition

作　　者：陶韦 武嘉文 刘长发[1] 方蕾[1] 刘远[1] 苑静涵 李晋 TAO Wei WU Jia-wen LIU Chang-fa FANG Lei LIU Yuan YUAN Jing-han LI Jin(Key Laboratory of Marine Environmental Research, Dalian Ocean University, Dalian 116023, P. R. China Institute of Ocean and Fisheries of Panjin, Panjin 124010,P. R. China)

机构地区：[1]近岸海洋环境科学与技术辽宁省高校重点实验室大连海洋大学,大连116023 [2]辽宁省盘锦市海洋与渔业研究所,盘锦124010

出　　处：《水生态学杂志》2017年第4期18-26,共9页Journal of Hydroecology

基　　金：国家自然科学基金(41171389);国家海洋公益性行业科研专项(201305043);辽宁省高等学校优秀科技人才支持计划(LR2013035);国家海洋局近岸海域生态环境重点实验室基金(201305)

摘　　要：生物有机体元素组成内稳性是生态化学计量学核心概念之一,研究植物N、P生态化学计量内稳性及N、P分配可以明确其生态策略和适应性、竞争性。采用室内盆栽方法,研究了翅碱蓬(Suaeda heteroptera)N、P内稳性与生长对模拟N、P沉降增加的响应。结果表明,N沉降增加情况下,翅碱蓬吸收积累N表现为"绝对"的生态化学计量内稳性;P沉降增加情况下,翅碱蓬吸收积累P呈现一定的生态化学内稳性,调节系数HP为0.754,HN∶P为0.792。N沉降增加促进了翅碱蓬积累P,翅碱蓬生长可能受N限制。N、P沉降增加情况下,翅碱蓬株重、P吸收积累量与株高间均表现为异速生长。N沉降增加,翅碱蓬株重生长比株高快,P积累相对减慢。P沉降增加,翅碱蓬株高生长比株重快,P积累也相对更快。Stoichiometric homeostasis is a core concept in ecological stoichiometry,defining the balance of chemical elements（ especially carbon,nitrogen and phosphorus） in living organisms. Investigating the maintenance of stoichiometric homeostasis in plants,and the allocation of nitrogen and phosphorus,will increase understanding of ecological strategies for improving adaptability and competitiveness. In this study,stoichiometric homeostasis of nitrogen and phosphorus in the pioneer halophytic plant Suaeda heteroptera Kitag. in response to simulated nitrogen and phosphorus deposition were examined using pot culture in a greenhouse. The effect of stoichiometric homeostasis of nitrogen and phosphorus on the allometric growth of Suaeda heteroptera was analyzed. A total of 13 N,P deposition treatments were set,including a control with no N or P deposition： six P gradient deposition treatments（ 0,1,2,3,4,5 mg/L） with a fixed N deposition concentration of 5 mg/L and six N gradient deposition treatments（ 0,4,8,12,16,20 mg/L） with a fixed P deposition concentration of 2 mg/L. All treatments were run in triplicate. On June 1,2012,Suaeda heteroptera seeds（ 0. 5 g） were planted in each treatment pot and thinned to five plants per pot after plants reached 5 cm. The experiment lasted 150 d,after which the height（ above ground） and dry weight of the plants were measured and the N and P concentrations of plants and soil were determined for each group. A strick nitrogen stoichiometric homeostasis was observed in the different nitrogen deposition treatments,while a lower degree of phosphorus stoichiometric homeostasis was observed in phosphorus deposition treatments,with homeostatic regulation coefficients of 0. 754（ HP） and 0. 792（ HN ∶ P）. The phosphorus content of Suaeda heteroptera increased with increasing nitrogen deposition,indicating that plant growth was limited by nitrogen supply. Plant weight and phosphorus content exhibited allometric scaling with plant height at all N,P deposition treatments.

关 键 词：N沉降 P沉降 生态化学计量内稳性 异速生长 翅碱蓬 

分 类 号：X826[环境科学与工程—环境工程]