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王继伟,赵成章,赵连春,王小鹏,李 群.内陆盐沼芦苇根系形态及生物量分配对土壤盐分因子的响应.生态学报,2018,(13).http://dx.doi.org/10.5846/stxb201707141283  
内陆盐沼芦苇根系形态及生物量分配对土壤盐分因子的响应
Response of root morphology and biomass of Phragmites australis to Soil salinity in an inland salt marsh
投稿时间:2017-07-14  修订日期:2018-02-03
DOI: 10.5846/stxb201707141283
关键词芦苇  根系形态  根系生物量  土壤盐分因子  适应策略
Key WordsPhragmites australis  root morphology  root biomass  The factor of soil salt  adaptation strategy
基金项目国家自然科学基金(41461013和91125014)和甘肃省生态学重点学科
作者单位E-mail
王继伟 西北师范大学地理与环境科学学院甘肃省湿地资源保护与产业发展工程研究中心 wangjiwei1209@163.com 
赵成章 西北师范大学地理与环境科学学院甘肃省湿地资源保护与产业发展工程研究中心 zhaocz601@163.com 
赵连春 西北师范大学地理与环境科学学院  
王小鹏 西北师范大学地理与环境科学学院  
李 群 西北师范大学地理与环境科学学院  
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摘要:
根系形态和生物量分配是决定根系吸收能力发挥的重要特征,其对环境限制因子的响应与适应策略一直是研究的热点。然而,有关土壤盐分对植物根系性状的影响还存在许多不确定性。选择兰州秦王川国家湿地公园芦苇群落为研究对象,垂直于沙河河岸从湿地边缘至湿地中心,依次设置3个不同土壤盐分梯度样地(样地I、样地II和样地III),采用全根挖掘法和Win-RHIZO根系分析仪相结合的方法,研究了芦苇(Phragmites australis)根冠比、根总长度、比根长、根分叉数、根平均直径等形态参数的变化特征。结果表明:研究区土壤水分含量总体较高,随着土壤盐分含量的增加,湿地群落的高度、盖度、密度、地上生物量逐渐下降;土壤含盐量以中度盐渍化为主,表层土壤盐分呈现强变异性,随着土层深度的增加各样地土壤含盐量均呈下降趋势,而变异程度有所差异;不同盐分梯度下芦苇根系形态学参数的响应不同,随着盐分胁迫程度的加剧,根冠比、根分叉数呈逐渐减小的趋势,比根长、根总长度呈先下降后上升的趋势,而根平均直径呈相反的变化趋势;相关性分析可知,土壤含盐量与根总长度和比根长呈极显著相关关系(P < 0.01),与根冠比、根分叉数呈显著相关(P < 0.05),而与根平均直径相关性不显著。内陆盐沼的芦苇表现出敏感植物的特性,通过根系形态的调整和生物量分配策略的改变来适应盐分强变异的土壤环境,体现了逆境胁迫下湿地植物应对多重环境选择压力的生态适应机制。
Abstract:
Root morphology and biomass allocation are important features to determine the capacity of root absorption, and which response to environmental constraints factor and adaptation strategies have been a hot topic of research. However, there are still many uncertainties about the effects of soil salinity on root traits of plant.The Phragmites australis community was selected as the object of study which in Qinwangchuan National Wetland Park of Lanzhou. Three different plots of soil salinity gradien(plot I、II and III) were set up from the edge to the center of wetland ,which perpendicular to the bank of Sha river. The Change characteristics of the morphological parameters , such as the ratio of root to shoot, total length of root, specific length of root, root forks and average diameter of root of Phragmites australis were studied using the Combined method of total root excavation with Win-RHIZO root analyzer.The results showed that the soil water content in the study area was higher . With the increase of soil salinity, the height, coverage, density and above-ground biomass of the wetland community decreased gradually. The soil salinity was dominated by moderate salinization, and the surface soil salinity showed strong variability, with the increase of soil depth, the soil salinity of the plots showed a decreasing trend, and the variation degree was different. The responses of root morphological parameters were different under different salt gradients. With the increase of salt stress, the ratio of root to shoot and root forks decreased gradually, and Specific root length and the total length of roots decreased firstly and then increased, while the average diameter of root shows the opposite trend. According to the correlation analysis, there was a significant correlation between soil salinity , total root length, soil salinity and Specific root length (P <0.01), significantly correlated between soil salinity with root/shoot ratio and root forks (P <0.05), but not significantly correlated with root mean diameter。The Phragmites australis of the inland salt marshes showed the characteristics of sensitive plants. It adapted to the soil environment with strong salt variation through the adjustment of root morphology and the change of the biomass allocation strategy,Which reflected the ecological adaptation mechanism of wetland plants to cope with multiple environmental selection pressures under adversity stress.
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