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贾雪莹,邹元春,姜明.模拟气候变化背景下铁输入对小兴凯湖狭叶甜茅生理生态的影响.生态学报,2017,37(14):4725~4733 本文二维码信息
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模拟气候变化背景下铁输入对小兴凯湖狭叶甜茅生理生态的影响
Effects of iron input on the performance of Glyceria spiculosa from the Xiaoxingkai Lake under simulated climate change
投稿时间:2016-04-15  
DOI: 10.5846/stxb201604150694
关键词温度  水位  铁输入  气候变化  小兴凯湖
Key Wordstemperature  water level  iron input  climate change  Xiaoxingkai Lake
基金项目国家自然科学基金资助项目(41271106,41271107)
作者单位E-mail
贾雪莹 中国科学院湿地生态与环境重点实验室, 中国科学院东北地理与农业生态研究所, 长春 130102;中国科学院大学, 北京 100049  
邹元春 中国科学院湿地生态与环境重点实验室, 中国科学院东北地理与农业生态研究所, 长春 130102  
姜明 中国科学院湿地生态与环境重点实验室, 中国科学院东北地理与农业生态研究所, 长春 130102 jiangm@neigae.ac.cn 
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摘要:
富铁地下水从农田流入湿地生态系统是近些年来湿地所面临的环境问题之一,在气候变化背景下更为复杂。通过湿地微生境人工模拟实验,研究铁输入、温度和水位3因素对兴凯湖湿地植物优势物种——狭叶甜茅(Glyceria spiculosa (Fr.Schmidt.) Rosh.)整个生长周期生理生态的影响。对狭叶甜茅的株高、叶片数目、基茎、叶面积,叶片叶绿素a、b,地上生物量及其总氮(TN)、总碳(TC)、总磷(TP)、总铁(TFe)含量的分析测试结果表明:(1)温度为主要影响因素,降温2℃效果明显且对株高、叶片数目和叶面积最显著。对照温度处理叶绿素a、b值最大,主要为生长速度相对缓慢而造成叶绿素聚集在细胞中导致浓度较高。(2)水位对狭叶甜茅基茎、地上部分总铁含量影响最显著,5 cm淹水处理更有利于地上部分总铁含量富集。(3) 3个铁输入强度对狭叶甜茅生理生态各指标没有达到显著水平。综合各指标特征加权分析表明,温度升高对其生长产生不利影响,降温2℃处理植物表现出良好的适应性,淹水及铁输入条件下其生长状况显著增强,以目前小兴凯湖外源铁输入强度情况下湿地植物铁含量会有所增加。可以推测,在全球变暖趋势下,狭叶甜茅这种对气候变化敏感的物种,其生存将面临一定的威胁。
Abstract:
In recent years, iron-rich groundwater from farmland drainage and upstream runoff has emerged as a serious environmental problem affecting into wetland ecosystems. This problem is further complicated by the background of climate change. A microcosm experiment was designed to investigate the responses of (Glyceria spiculosa (Fr.Schmidt.) Rosh.) to covarying iron (Fe) concentrations, hydroperiods, and temperatures, in order to better predict the future distribution of G.spiculosa in the Xiaoxingkai Lake wetlands. To test the entire growth cycle of G.spiculosa under conditions that prevail in the field, this study used three artificial climate chambers and a factorial design consisting of three Fe levels, three temperature settings, and three water levels. Plant response variables were height, leaf number, stem diameter, leaf area, chlorophyll a and b, biomass; also measured were total concentrations of iron, carbon, phosphorus, and nitrogen. The results showed the following: 1) The main effect of temperature on plant height, leaf number, and leaf area was significant, with the greatest values occurring in the -2℃ treatment. The temperature effect on chlorophyll a and b was significant, as well, with the greatest values in the ambient temperature treatment, likely because of the relatively slow growth rate and higher chlorophyll accumulation in cells; 2) The main effect of water level on stem diameter and total iron concentration of aboveground biomass was highly significant (P<0.001). The 5 cm waterlogging treatment was the most favorable for increasing Fe uptake and accumulation in plants, such that total Fe concentration aboveground was increased by 227.1% and 475.9% versus the 0 cm and -5 cm treatment levels, respectively. Lastly, 3) the main effect of Fe level on all the ecophysiological traits investigated were insignificant (P<0.05). Based on this comprehensive analysis of G.spiculosa in its different growing stages, we conclude that an increase in temperature had adverse effects on G.spiculosa growth, and that it performed the best in the -2℃ treatment. It is also noteworthy that G.spiculosa grew better under flooded conditions. However, the current Fe input concentrations should not significantly affect the growth of G.spiculosa. Presumably, under accelerated global warming, G.spiculosa-which was clearly sensitive to climate change-will face a near-certain threat. This could have consequences for the ecological structure and functions of these wetlands
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