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当前位置: 首页 > 文章 > 盐度和氮添加对盐碱湿地芦苇幼苗生长及生物量分配的影响 土壤与作物 2018 (2) 257-265
Position: Home > Articles > Effects of salinity and nitrogen addition on growth and biomass allocation of Phragmites australias seedlings in saline-alkali wetland Soil and Crop 2018 (2) 257-265

盐度和氮添加对盐碱湿地芦苇幼苗生长及生物量分配的影响

作  者：
潘艳文;古勇波;唐占辉;姜明;吕宪国;娄彦景
单  位：
中国科学院大学;中国科学院东北地理与农业生态研究所湿地生态与环境重点实验室;东北师范大学环境学院国家环保部湿地生态与植被恢复重点实验室
关键词：
功能性状;地上生物量;地下生物量;根冠比;盐沼
摘  要：
以莫莫格国家自然保护区盐碱湿地的芦苇(Phragmites australias)为研究对象,基于氮(0、11.25 g·m~(-2)、45 g·m~(-2)及90 g·m~(-2)NH_4NO_3)/盐(0、5‰、10‰及15‰NaCl)交互的盆栽实验,探究盐度和氮添加对植株幼苗生长及生物量分配的影响。结果表明:(1)随着盐度的增加,芦苇幼苗的株高、叶面积和比叶面积都显著降低(P<0.05),根冠比增加,而地上生物量、地下生物量和总生物量都先增加后降低(P>0.05);(2)随着氮添加的增多,芦苇幼苗的株高、叶面积、地上生物量、地下生物量和总生物量都显著增加(P<0.05),而比叶面积和根冠比降低(P>0.05);(3)盐度和氮添加二者交互作用对幼苗生长和生物量分配的影响都不显著(P>0.05),但任何盐度梯度下增加氮含量均能够促进幼苗生长和生物量积累。对盐沼芦苇而言,在其幼苗生长阶段,施加适量的氮肥可以缓解盐胁迫产生的危害,从而有利于幼苗生长,是一种可行的调控措施。
译  名：
Effects of salinity and nitrogen addition on growth and biomass allocation of Phragmites australias seedlings in saline-alkali wetland
作  者：
PAN Yanwen;GU Yongbo;TANG Zhanhui;JIANG Ming;L Xianguo;LOU Yanjing;Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agroecology,CAS;University of Chinese Academy of Sciences;Key Laboratory of Wetland Ecology and Vegetation Restoration,State Environmental Protection,Northeast Normal University;
关键词：
functional traits;;aboveground biomass;;belowground biomass;;root-shoot ratio;;salt marsh
摘  要：
Aiming at understanding the effects of salinity and nitrogen addition on growth and biomass allocation of Phragmites australias seedling in Momoge National Nature Reserve,we conducted a pot experiment with four levels of N addition( 0,11. 25,45 and 90 g·m~(-2) NH_4NO_3) and salinity( 0,5‰,10‰ and 15‰ NaCl) treatments. Our results showed that:( 1) salinity had significant effects on the seedling growth,but not on biomass. With salinity increasing,the individual height,leaf area and special leaf area of the seedling decreased,and the shoot-root ratio increased,while aboveground,belowground and total biomass increased first and then decreased.( 2) N addition had significant effects on individual height,leaf area,aboveground,belowground and total biomass,but not on special leaf area and root-shoot ratio. With the increase of N concentration, the individual height, leaf area,aboveground,belowground and total biomass of the seedlings increased significantly while special leaf area and root-shoot ratio decreased.( 3) the interaction of salinity and N addition had no significant effects on seedling growth and biomass allocation,but increasing N concentration could promote seedling growth and biomass accumulation under all salinity treatments( 0-15‰). Our study demonstrated that increasing N concentration moderately in the growth stage would be a feasible regulatory approach for Phragmites australias in salt marsh to alleviate the damage caused by salt stress.

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