| 闽江河口湿地典型植物群落及交错带植硅体碳分布特征研究 |
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| 引用本文： | 米慧珊,高会,翟水晶,孙志高,何涛.闽江河口湿地典型植物群落及交错带植硅体碳分布特征研究[J].第四纪研究,2019,39(1):99-107. |
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| 作者姓名： | 米慧珊 高会 翟水晶 孙志高 何涛 |
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| 作者单位： | 福建师范大学地理科学学院,福建 福州 350007;福建师范大学湿润亚热带生态地理过程教育部重点实验室,福建 福州 350007;福建师范大学地理科学学院,福建 福州 350007;福建师范大学湿润亚热带生态地理过程教育部重点实验室,福建 福州 350007;福建师范大学地理研究所,福建 福州 350007 |
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| 基金项目： | 国家自然科学基金;国家自然科学基金;福建省公益类科研院所基本科研专项;研究生科研创新项目 |
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| 摘 要： | 湿地既是"碳汇"也是"碳源",研究发现,碳可以被长久稳定地封存在植硅体内,不同植物的植硅体封存碳的能力有明显差异。选取闽江河口鳝鱼滩湿地芦苇群落、短叶茳芏群落、互花米草群落及交错带为研究对象,研究这3种植物植硅体碳(Phytolith-Occluded Carbon,简称PhytOC)含量和储量的空间变化特征和影响因素,探讨PhytOC含量在纯群落和交错带的差异,为研究植物竞争和碳循环过程提供依据。结果表明:受水文条件、植物生长和空间扩展等影响,闽江河口湿地植物PhytOC含量整体表现为近岸区高于近海区,PhytOC储量表现为纯群落高于交错带。PhytOC含量依次表现为芦苇纯群落(4.14 mg/g) > 交错带芦苇(3.67 mg/g) > 与芦苇交错的短叶茳芏(3.08 mg/g) > 互花米草纯群落(2.70 mg/g) > 与互花米草交错的短叶茳芏(1.96 mg/g) > 交错带互花米草(1.86 mg/g) > 短叶茳芏纯群落(1.75 mg/g)。短叶茳芏与芦苇相互扩展中短叶茳芏植物整体及各器官PhytOC含量均升高,而与互花米草相互扩展时短叶茳芏除了根系、茎以外各器官PhytOC含量均下降。3种植物各器官在交错带中PhytOC储量分配比明显不同于纯群落,根系PhytOC储量的分配比上升,提高了根系竞争力。芦苇、短叶茳芏、互花米草通过植硅体封存的碳储量分别占植物碳储量的0.27%、0.15%和0.07%,但植物间的扩展过程影响了植物的PhytOC储量,其中短叶茳芏与互花米草形成的交错带中短叶茳芏下降幅度最高(56.29%),互花米草下降幅度最低(26.15%)。由此可见,植物的空间扩展对植物PhytOC含量、储量以及在不同器官的分配比都有一定的影响,短叶茳芏在与芦苇和互花米草竞争时分别采取不同的PhytOC分配机制。
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| 关 键 词： | 植硅体碳 植物空间扩展 湿地 闽江河口 |
DISTRIBUTION CHARACTERISTICS OF PHYTOLITH-OCCLUDED CARBON IN TYPICAL PLANT COMMUNITIES AND ECOTONES IN THE MIN RIVER ESTUARY |
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| Mi Huishan,Gao Hui,Zhai Shuijing,Sun Zhigao,He Tao.DISTRIBUTION CHARACTERISTICS OF PHYTOLITH-OCCLUDED CARBON IN TYPICAL PLANT COMMUNITIES AND ECOTONES IN THE MIN RIVER ESTUARY[J].Quaternary Sciences,2019,39(1):99-107. |
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| Authors: | Mi Huishan Gao Hui Zhai Shuijing Sun Zhigao He Tao |
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| Institution: | (School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,Fujian;Key Laboratory of Humid Subtropical Eco-geographical Process,Ministry of Education,Fujian Normal University,Fuzhou 350007,Fujian;Institute of Geography,Fujian Normal University,Fuzhou 350007,Fujian) |
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| Abstract: | Wetland is regarded as not only "carbon sink" but also "carbon source". Recent studies have found that carbon can be stably and permanently encapsulated in phytoliths, and the ability of phytoliths in different plants to retain carbon is significantly different. In Shanyutan wetland(26°00'36"~26°03'42"N, 119°34'12"~119°40'40"E) of the Min River Estuary, Phragmites australis community, Cyperus malaccensis community and Spartina alternifloras community continually expanded as belts from the bank to the sea. The spatial variation characteristics and influencing factors of Phytolith-occluded Carbon(PhytOC) contents and stocks in these communities and their ecotones were investigated. The difference of PhytOC contents between pure communities and ecotones was studied to provide evidence for plants competition and carbon cycling. Results showed that, affected by hydrological conditions, plant growth and spatial expansion, the PhytOC contents in the nearshore area was generally higher than that in the offshore area, and the PhytOC stocks higher in pure communities than that in ecotones. In order of PhytOC contents, it goes:Phragmites australi (4.14 mg/g), the Phragmites australi in Phragmites australi-Cyperus malaccensi ecotone(3.67 mg/g), the Cyperus malaccensi in Phragmites australi-Cyperus malaccensi ecotone(3.08 mg/g), Spartina alterniflora(2.70 mg/g), the Cyperus malaccensi in Cyperus malaccensi-Spartina alterniflora (1.96 mg/g), the Spartina alterniflora in Cyperus malaccensi-Spartina alterniflora (1.86 mg/g) and Cyperus malaccensi (1.75 mg/g). PhytOC contents in Cyperus malaccensi and its organs increased when it expanded with Phragmites australi, but decreased when expanded with Spartina alterniflora except for root and stem. Although the allocation ratios of PhytOC stocks in different organs of three marsh plants varied during plant spatial expansion, however, more silicon nutrients were allocated to the roots to improve competitiveness, and the allocation ratios of PhytOC stocks in the roots in the ecotones increased. The carbon stocks occluded by phytoliths of Phragmites australis, Cyperus malaccensis and Spartina alternifloras accounted for 0.27%, 0.15% and 0.07% of plant carbon stocks respectively. But the spatial expansion of plants affects PhytOC stocks. Among them, in the ecotone formed by Cyperus malaccensis and Spartina alternifloras, Cyperus malaccensis decreased most by 56.29%, and Spartina alternifloras decreased least by 26.15%. It can be concluded that plant expansion in the ecotone had certain effects on PhytOC contents, stocks and allocation ratio of different organs. The Cyperus malaccensis adopts different PhytOC allocation mechanism when competing with Phragmites australis and Spartina alternifloras. |
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| Keywords: | PhytOC plant spatial expansion marsh Min River Estuary |
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