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2015年7月末不同淹水条件下闽江河口沼泽土壤中有机碳和氮的分布

Distributions of Soil Organic Carbon and Nitrogen in Marshes of the Minjiang River Estuary in the End of July of 2015 under Different Flooding Conditions
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摘要 在闽江河口鳝鱼滩,选择了不同淹水状况的两条采样带(采样带A,远离主潮沟且退潮后无淹水;采样带B,靠近主潮沟且退潮后有淹水),以短叶茳芏(Cyperus malaccensis)沼泽、互花米草(Spartina alterniflora)沼泽和扁穗沙草(Cyperus compressus)沼泽为研究对象,于2015年7月26日(小潮日),在采样带中的6个采样点,采集了0-60 cm深度的土样,测定土样的有机碳、全氮、硝态氮和铵态氮含量,并分析其空间分布特征。结果表明,采样带A中的短叶茳芏沼泽、互花米草沼泽和扁穗莎草沼泽土壤有机碳质量比分别为(26.46±4.18)g/kg、(25.29±1.49)g/kg和(33.58±2.74)g/kg,采样带B中的短叶茳芏沼泽、互花米草沼泽和扁穗莎草沼泽土壤有机碳质量比分别为(16.63±3.43)g/kg、(13.01±1.48)g/kg和(13.56±0.82)g/kg,长期淹水环境使采样带B各群落区的土壤有机碳含量都明显低于采样带A,分别低37.14%、48.57%和59.60%;与采样带A相比,长期淹水环境降低了采样带B中的短叶茳芏沼泽的土壤全氮含量及其垂直变异性,但增加了扁穗莎草沼泽土壤全氮含量及其垂直变异性,互花米草沼泽土壤全氮含量及其分布特征受淹水环境的影响不明显。采样带B各群落区0-10 cm深度土壤铵态氮含量较小,而在其它土壤深度的含量都高于采样带A;与之相反,互花米草沼泽和扁穗莎草沼泽0-10 cm深度土壤硝态氮含量较大,在其它深度的含量都低于采样带A。淹水条件是导致采样带A和B相同植物群落沼泽土壤碳、氮含量空间分布差异的重要因素。 To explore the spatial distribution of soil organic carbon, total nitrogen, nitrate nitrogen, ammonium nitrogen contents in soils of tidal marshes in the Shanyutan of the Min River estuary, from the land to the sea,two transects(A transect, away from the main tidal channels with no flooding as the tide ebbs; B transect, near the main tidal channels with flooding as the tide ebbs) with different flooding regimes were laid and three typical marshes of Cyperus malaccensis marsh, Spartina alterniflora marsh and Cyperus compressus marsh were selected. The soil samples of 0-60 cm were selected on July 26, 2015(Neap tide). The results showed that the contents of soil organic carbon in soils of Cyperus malaccensis marsh, Spartina alterniflora marsh and Cyperus compressus marsh were respectively(26.46±4.18) g/kg,(25.29±1.49) g/kg and(33.58±2.74) g/kg at A transect, and those of B transect were respectively(16.63±3.43) g/kg,(13.01±1.48) g/kg and(13.56±0.82) g/kg,that was long-term flooding regime caused the contents of soil organic carbon in soils of Cyperus malaccensis marsh, Spartina alterniflora marsh and Cyperus compressus marsh at B transect were much lower than those at A transect, and the values decreased by 37.14%, 48.57% and 59.60%, respectively. Compared with A transect, long-term flooding regime decreased the total nitrogen content and its vertical variability in Cyperus malaccensis marsh soil but increased the total nitrogen content and its vertical variability in Cyperus compressus marsh soil of B transect, while the nitrogen content and its distribution characteristics in Spartina alterniflora marsh soil of B transect were not affected by flooding environment. Except for the surface soil layer(0-10 cm), the ammonium nitrogen content in three marsh soils of B transect was higher than that of A transect while the nitrate nitrogen content showed the oppsite trend in other soil layers except for the topsoil(0-10 cm)in Spartina alterniflora marsh and Cyperus compressus
作者 王杰 孙志高 李家兵 何涛 范爱连 高会 王华 WANG Jie1,2,3, SUN Zhigao1,2,3, LI Jiabing4, HE Wao1,2,3, FAN Ailian1,2,3, GAO Hui1,2,3, WANG Hua1,2,3(1. Institute of Geography, Fujian Normal University, Fuzhou 350007, Fujian, P.R.China; 2. Key Laboratory of Humid Subtropical Eco-geographical Process (Fujian Normal University), Ministry of Education, Fuzhou 350007, Fujian, P.R. China; 3. Fujian Provincial Key Laboratory for Subtropical Resources and Environment, Fujian Normal University, Fuzhou 350007, Fujian, P.R. China; 4. College of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, Fujian, P.R.China)
出处 《湿地科学》 CSCD 北大核心 2018年第4期559-567,共9页 Wetland Science
基金 福建省公益类科研院所专项项目(2016R1032-1) 福建省高等学校“新世纪优秀人才计划”项目 福建省“闽江学者奖励计划”项目资助
关键词 有机碳 土壤 沼泽 淹水条件 闽江河口 organic carbon nitrogen soil marsh flooding condition Min River estuary
作者简介 王杰(1993-),男,河北省邯郸人,硕士研究生,主要从事河口湿地生物地球化学方面的研究。E-mail:wj61993@163.com;通讯作者:孙志高,研究员。E-mail:zhigaosun@163.com
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