黄河三角洲湿地土壤碳与植物群落关系研究

发布时间：2017-12-28 10:42

本文关键词：黄河三角洲湿地土壤碳与植物群落关系研究　出处：《聊城大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以黄河三角洲原生湿地为研究区,选;取以碱;蓬、柽;柳和芦;苇为优;势种的典;型植物群;落,基于植被调查和环境监测的第一手资料,运用数量生态学等方法,阐述了三种典型植被群落的植物特征、群落环境因子特征、土壤碳分布及CO_2释放特征,研究了群落环境因子与土壤碳之间的相互关系。结果显示:(1)黄河三角洲湿地自然植被从碱蓬群;落至芦苇群;落,物;种的多样性指;数和丰;富度指;数呈增;加趋;势,而均;匀度指;数呈降;低趋;势。(2)三种典型植物群落的土壤养分含量表现为:芦苇群落最高,柽柳群落次之,碱蓬群落最低;且土壤各养分指标间表现为极显著或显著正相关。土壤盐分含量表现为:碱蓬群落最高,柽柳群落次之,芦苇群落最低;且土壤各盐分之间(除碳酸根离子和pH外)多呈极显著或显著正相关关系,但碳酸根离子、pH与各盐分指标之间表现为呈负相关关系。此外,碱蓬群落的大气温度、大气湿度和土壤温度最低,柽柳群落的大气温度、大气湿度和土壤温度最高,芦苇群落的土壤湿度最高;且土壤湿度与大气温度、大气湿度和土壤温度呈极显著或显著负相关关系,大气温度、大气湿度和土壤温度之间表现为极显著正相关关系。(3)三种植物群落的土壤有机碳含量表现为芦苇群落柽柳群落碱蓬群落,土壤无机碳含量变化并不显著。土壤有机碳和无机碳含量都随土壤深度增加而呈现降低趋势。土壤CO_2释放速率表现为芦苇群落碱蓬群落柽柳群落,且芦苇群落的土壤呼吸速率远高于碱蓬群落和柽柳群落。(4)从碱蓬群;落至芦苇群;落,土壤中有机碳含量呈逐渐增加的趋势,无机碳含量没有显著变化差异;土壤CO_2释放呈逐渐增加的趋势。土壤有机碳与土壤各养分指标呈显著正相关关系,与各盐分指标的相关性并不显著;土壤无机碳与各养分、盐分指标呈正相关关系,但相关性较弱。植物群落内的近地面大气温度、土壤温度和土壤湿度是土壤二氧化碳释放速率的主要影响因子。
[Abstract]:Based on the original wetland in the Yellow River Delta as the study area, selected by alkali;; Peng, Liu Cheng; and Lu Wei; advantage; potential species type code; flora; fall, vegetation survey and environmental monitoring based on first-hand information, using quantitative ecology methods, expounds three kinds of plant characteristics, the typical vegetation community characteristics, environmental factors of soil carbon distribution and CO_2 emission characteristics, studies the relationship between environmental factors and soil carbon community. The results showed as follows: (1) the natural vegetation in the Yellow River delta wetland was from Suaeda group to reed group; the diversity index of species; number and abundance; richness index; number increasing; increasing trend; potential and average; evenness index; number decreasing; low trend; potential. (2) the soil nutrient contents of three typical plant communities were as follows: reed community was the highest, followed by Tamarix chinensis community and Suaeda communis community was lowest, and soil nutrient indicators showed significant or significant positive correlation. Soil salt content is: the highest Suaeda salsa community, Tamarix chinensis community of reed community and the lowest; soil salt (except between carbonate ion and pH) were significant or very significant correlation, but between carbonate ion, pH and the salt index showed negative correlation. In addition, Suaeda community air temperature and air humidity and soil temperature is lowest, Tamarix air temperature, air humidity and soil temperature, soil moisture was highest in reed community; and the soil humidity and air temperature, air humidity and soil temperature was very significant or significant negative correlation between air temperature and air humidity and the soil temperature showed extremely significant positive correlation. (3) the content of soil organic carbon in three species of plant community was found in the reed community of Tamarix Tamarix community, and the content of soil inorganic carbon was not significant. The content of soil organic carbon and inorganic carbon decreased with the increase of soil depth. The rate of soil CO_2 release is the Tamarix communis community in the reed community, and the soil respiration rate of the reed community is much higher than that of the alkali and Tamarix communities. (4) from the Suaeda group to the Phragmites australis group, the organic carbon content in the soil increased gradually. There was no significant difference in the inorganic carbon content. The soil CO_2 emission increased gradually. Soil organic carbon is positively correlated with soil nutrient indicators, and has no significant correlation with salt indexes. Soil inorganic carbon is positively correlated with nutrient and salt indicators, but the correlation is weak. The atmospheric temperature, soil temperature and soil moisture in the plant community are the main factors affecting the carbon dioxide release rate of the soil.
【学位授予单位】：聊城大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：Q948.1

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