| 闽江河口区盐—淡水梯度下芦苇沼泽土壤有机碳特征 |
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| 引用本文： | 王维奇,王纯,仝川,曾从盛,贾瑞霞,黄佳芳.闽江河口区盐—淡水梯度下芦苇沼泽土壤有机碳特征[J].湿地科学,2012,10(2):164-169. |
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| 作者姓名： | 王维奇 王纯 仝川 曾从盛 贾瑞霞 黄佳芳 |
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| 作者单位： | 福建师范大学地理研究所,福建师范大学亚热带湿地研究中心,福建福州350007 |
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| 基金项目： | 国家自然科学基金项目(41071148和31000209);福建省公益类研究所专项项目(2011R1037-5);福建省教育厅项目(JB11030)资助 |
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| 摘 要： | 为了阐明盐—淡水梯度下河口潮汐沼泽土壤有机碳特征,对闽江河口盐—淡水梯度下芦苇(Phragmites australis)沼泽土壤有机碳含量、储量及其影响因子进行了测定与分析。结果表明,随着芦苇沼泽由淡水向半咸水沼泽演替,沼泽土壤粘粒和粉粒组成都在增加,土壤pH、容重和砂粒组成则在减小;尤溪洲湿地、蝙蝠洲湿地和鳝鱼滩湿地上分布的芦苇沼泽0～60cm土壤的有机碳含量分别为11.56～14.72g/kg、14.01～19.72g/kg和20.93～22.89g/kg,其平均值分别为12.47g/kg、16.62g/kg和21.97g/kg;3个采样点的0～60cm深度各层土壤有机碳储量范围分别为1408.71～1670.31t/km2、1328.44～1659.80t/km2和1319.93～1677.96t/km2,其平均值分别为1534.13t/km2、1548.12t/km2和1569.22t/km2;3块湿地芦苇沼泽0～60cm土壤的总有机碳储量分别为9204.79t/km2、9288.71t/km2和9415.35t/km2。在盐—淡水梯度下,芦苇沼泽土壤有机碳含量和储量都表现为随着盐度的增加而升高;盐—淡水梯度下沼泽土壤有机碳含量受到多个因子的调控。
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| 关 键 词： | 盐度梯度 芦苇沼泽 土壤有机碳 闽江河口 |
Soil Organic Carbon along a Salinity Gradient in Phragmites australis Marsh in the Minjiang River Estuary |
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| WANG Wei-Qi
,
WANG Chun
,
TONG Chuan
,
ZENG Cong-Sheng
,
JIA Rui-Xia
,
HUANG Jia-Fang.Soil Organic Carbon along a Salinity Gradient in Phragmites australis Marsh in the Minjiang River Estuary[J].Wetland Science,2012,10(2):164-169. |
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| Authors: | WANG Wei-Qi WANG Chun TONG Chuan ZENG Cong-Sheng JIA Rui-Xia HUANG Jia-Fang |
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| Institution: | (Institute of Geography,Research Centre of Wetlands in Sub-tropical Regions,Fujian Normal University,Fuzhou 350007,Fujian,P.R.China) |
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| Abstract: | Wetlands are an important ecosystem for carbon storage,contributing 20% of continental carbon storages within 4%-5% of the continental areas.Carbon cycling has become an important ecosystem service set against a background of climate change.China has a coastline of 18 000 km along which there is an estimated 12 000 km2 of tidal estuarine wetlands.These tidal wetlands are generally rich in animal and plant biodiversity and appear to have an important biogeochemical role within the estuary ecosystem.Estuarine wetlands occur along salinity gradient as a result of tidal inundation and this influences carbon storages by regulating the inputs and outputs of dissolved carbon and the accumulation and erosion of carbon.Research in this area is conflicting.The Min River estuarine wetlands are an important tidal wetland ecosystem in south-east China,as it is located at the boundary between mid-and southern subtropical climate zones.This estuarine wetland is close to Fuzhou city where rapid economic development,building construction and expansion of the city scale has intensified the use of the wetland and over-exploitation of the wetland resources has occurred.As a result,the area of natural wetland is decreasing and the ecosystem services are reducing as its ecological functions are impaired.The Minjiang River estuary is a typical tidal estuary in the south-east of China;Phragmites australis is the dominant species and distributed from upper to lower reaches.Soil depth profiles(0-60 cm cores) were collected from three Phragmites australis communities spread across three wetlands distributed along a salinity gradient;these cores were divided in 10 cm layers and various soil properties were measured including soil organic carbon concentrations.Soil pH,bulk density,sand composition all decreased with soil salinity increased,but,soil clay and silt composition increased.Soil organic carbon concentrations(0-60 cm depths) ranged between 11.6-14.7 g/kg,14.1-19.2 g/kg and 20.9-2.9 g/kg,respectively in the Phragmite australis marshes in the Youxizhou,Bianfuzhou and Shanyutan wetlands as salinity increased.The amount of carbon stores in each layer in the 3 communities also increased with salinity from 1 408-1 670 t/km2,1 328-1 660 t/km2 and 1 320-1 678 t/km2,respectively with mean site values of 1 534 t/km2,1 548 t/km2 and 1 569 t/km2,respectively.The total soil(0-60 cm) carbon storages were 9 204.79 t/km2,9 288.71 t/km2 and 9 415.35 t/km2,respectively.Soil organic carbon concentration and storage increased as soil salinity increased.Soil organic carbon concentration was influenced by many factors. |
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| Keywords: | salinity gradient Phragmite australis marsh soil organic carbon Minjiang River estuary |
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