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引用本文:冯文娟,徐力刚,王晓龙,程俊翔,姜加虎,鄢帮有.鄱阳湖湿地植物灰化薹草(Carex cinerascens)对不同地下水位的生理生态响应.湖泊科学,2018,30(3):763-769. DOI:10.18307/2018.0318
FENG Wenjuan,XU Ligang,WANG Xiaolong,CHENG Junxiang,JIANG Jiahu,YAN Bangyou.Ecophysiological response of a wetland plant (Carex cinerascens) to different groundwater depths in Lake Poyang wetland. J. Lake Sci.2018,30(3):763-769. DOI:10.18307/2018.0318
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鄱阳湖湿地植物灰化薹草(Carex cinerascens)对不同地下水位的生理生态响应
冯文娟1,2, 徐力刚1, 王晓龙1, 程俊翔1,2, 姜加虎1, 鄢帮有3
1.中国科学院南京地理与湖泊研究所中国科学院流域地理学重点实验室, 南京 210008;2.中国科学院大学, 北京 100049;3.江西省山江湖开发治理委员会办公室, 南昌 330046
摘要:
地下水位在非淹水期对湿地植物的生长影响较大,但目前相关研究十分缺乏.本文选择鄱阳湖典型植被灰化薹草(Carex cinerascens)为研究对象,研究不同地下水位(地下水位埋深10、20、40、80和120 cm)对灰化薹草形态指标、地上生物量和生理指标的影响.结果表明,随着地下水位埋深的增加,灰化薹草的株高、叶长和生物量均显著降低,地下水位10 cm处理组的灰化薹草生物量为0.371±0.017 g,为地下水位120 cm处理组(0.084±0.004 g)的4.4倍;处理组间灰化薹草叶片中超氧化物歧化酶活性、过氧化物酶活性、游离脯氨酸含量和叶绿素含量均存在显著差异,其中游离脯氨酸含量由地下水位10 cm处理组的6.29±0.70 μg/g增加到地下水位120 cm处理组的8.54±1.37 μg/g,表明随着地下水位埋深的增加,灰化薹草面临一定程度的干旱胁迫.灰化薹草的生理生态响应综合表明,地下水位埋深20 cm以内适宜灰化薹草的生长,地下水位埋深80 cm以上的干旱胁迫会阻碍灰化薹草的生长.
关键词:  鄱阳湖湿地  灰化薹草  地下水位埋深  形态特征  地上生物量  酶活性  生理生态响应
DOI:10.18307/2018.0318
分类号:
基金项目:国家自然科学基金项目(41371121,41271034)、国家重点基础研究发展计划"973"项目(2012CB417005)和赣鄱英才555工程项目联合资助.
Ecophysiological response of a wetland plant (Carex cinerascens) to different groundwater depths in Lake Poyang wetland
FENG Wenjuan1,2, XU Ligang1, WANG Xiaolong1, CHENG Junxiang1,2, JIANG Jiahu1, YAN Bangyou3
1.Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.University of Chinese Academy of Sciences, Beijing 100049, P. R. China;3.Office of the Mountain-River-Lake Development Committee of Jiangxi Province, Nanchang 330046, P. R. China
Abstract:
Groundwater depth is important to wetland vegetation during non-inundation. However, the relationship between groundwater and wetland plants is still scarce. In this study, we investigated the effects of groundwater depth on the growth of Carex cinerascens, one of the dominant species in the Lake Poyang wetland based on controlled experiments. The experiment includes five groundwater depth treatments (10, 20, 40, 80 and 120 cm). Morphological and physiological characteristics of C. cinerascens as well as aboveground biomass were monitored. The results showed that the plant height, leaf length and aboveground biomass decreased with increasing groundwater depth. The biomass in 10 cm treatment (0.371±0.017 g) is 4.4 times of that in 120 cm treatment (0.084±0.004 g). The groundwater depth has significant effect on the enzyme activities, proline and chlorophyll. The proline content increased from 6.29±0.70 μg/g in 10 cm treatment to 8.54±1.37 μg/g in 120 cm treatment. These physiological differences among treatments suggested C. cinerascens would encounter some drought stress along with increased groundwater depth. All the results indicated areas with groundwater depth of less than 20 cm were suitable for C. cinerascens growth, but the growth of C. cinerascens would be impeded when the groundwater depth was below 80 cm.
Key words:  Lake Poyang wetland  Carex cinerascens  groundwater depth  morphological characteristic  aboveground biomass  enzyme activity  ecophysiological response
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