胶州湾互花米草湿地土壤硫素分布特征及其影响因素

发布时间：2018-07-07 17:00

本文选题：胶州湾 + 互花米草　；参考：《青岛大学》2017年硕士论文

【摘要】：胶州湾湿地位于青岛市,是山东半岛面积最大的滨海湿地,也是青岛的自然资源宝库。湿地作为生态系统复杂多变,对生态及环境有重要影响。硫素作为继氮、磷、钾元素之后的第四位重要营养元素,在植物生长发育过程中具有重要的作用,同时对维持生态系统的健康发展也有着重要的意义。湿地硫的生物地球化学循环过程在湿地生态系统中起着重要作用,为了更好地了解硫素在湿地生态系统中的地位和作用,本研究将胶州湾互花米草湿地作为主要研究区域,通过野外采样、室内实验,分别利用氯化钙浸提-硫酸钡比浊法、酸消解-硫酸钡比浊法测定土壤有效硫含量及土壤总硫含量以便探究互花米草湿地土壤中硫素含量的时空分布特征;并利用常规的理化性质测定方法来测定土壤硫素含量的相关影响因素;同时对比分析了草地和光滩土壤中硫素含量差异性以及两者对应的时空分布特征;揭示了外来种互花米草对胶州湾湿地土壤硫素的影响,以及土壤理化性质与湿地土壤硫素含量的相关性,以期了解胶州湾互花米草湿地营养元素特征提供基础资料。本研究得到的主要结果如下:(1)2015年和2016年胶州湾互花米草湿地在土层0-60 cm中土壤总硫和土壤有效硫的垂直分布特征均是整体上呈现出自上而下其含量逐渐降低的分布特征。(2)分别对比2015年和2016年湿地互花米草区和光滩区中土壤总硫和土壤有效硫含量,发现互花米草区土壤总硫和土壤有效硫含量均高于光滩区土壤中其含量。(3)2015年和2016年9-11月互花米草湿地0-60 cm土层中土壤总硫的平均含量分别为1.49 g/kg、1.34 g/kg,土壤有效硫均值分别为651.56 mg/kg、696.54 mg/kg。可见2016年土壤总硫含量有所降低;而土壤有效硫含量有所上升。(4)2015年胶州湾互花米草湿地草区土壤总硫含量随着四季变化表现为先降低后升高再降低,土壤有效硫含量表现为随四季变化先升高再降低;而光滩区土壤总硫和土壤有效硫含量则均是随着四季变化逐渐递减。2016年胶州湾互花米草湿地草区土壤总硫含量随月份变化,6月最低,9月最高;土壤有效硫含量也是在6月最低,9月、10月、11月含量差异不大。而光滩区土壤总硫含量则在6月最高,10月最低;土壤有效硫含量表现为随月份变化逐渐降低,6月最高,11月最低。(5)互花米草各器官对同种元素具有不同的累积能力,其中总硫的含量有所不同。2015年互花米草各器官中总硫含量表现为:根叶茎。2016年互花米草各器官中总硫含量大致表现为:叶根茎。(6)影响胶州湾互花米草湿地土壤硫素含量变化的主要因子有:土壤有机质、土壤pH、可溶性盐含量。其中土壤有机质、可溶性盐含量与土壤硫素含量极显著正相关(P0.01),土壤pH与其极显著负相关(P0.01)。
[Abstract]:Jiaozhou Bay Wetland, located in Qingdao, is the largest coastal wetland in Shandong Peninsula and the treasure house of Qingdao's natural resources. As a complex and changeable ecosystem, wetland has an important impact on ecology and environment. Sulfur, as the fourth important nutrient element after nitrogen, phosphorus and potassium, plays an important role in plant growth and development, and also plays an important role in maintaining the healthy development of ecosystem. The biogeochemical cycling process of sulfur in wetland plays an important role in wetland ecosystem. In order to better understand the role of sulfur in wetland ecosystem, the Jiaozhou Bay Spartina alterniflora wetland is taken as the main research area in this study. Through field sampling and laboratory experiments, calcium chloride extraction and barium sulfate turbidimetric method were used respectively. Acid digestion-barium sulfate turbidimetric method was used to determine available sulfur content and total sulfur content in order to investigate the temporal and spatial distribution of sulfur content in Spartina alterniflora wetland. The related factors of sulfur content in soil were determined by conventional physical and chemical methods, and the difference of sulfur content in grassland and Guangtan soil and their spatio-temporal distribution characteristics were compared and analyzed. The effects of exotic species Spartina alterniflora on soil sulfur content in Jiaozhou Bay wetland and the correlation between soil physical and chemical properties and soil sulfur content were revealed in order to provide basic data for understanding nutrient element characteristics of Spartina alterniflora wetland in Jiaozhou Bay. The main results of this study are as follows: (1) the vertical distribution of soil total sulfur and soil available sulfur in Jiaozhou Bay Spartina alterniflora wetland in 2015 and 2016 in 0-60 cm soil layer is the overall top-down content gradually decreased. (2) comparison of soil total sulfur and soil available sulfur content in 2015 and 2016, respectively, It was found that the content of total sulfur and available sulfur in soil in Spartina alterniflora region was higher than that in light beach area. (3) the average content of soil total sulfur in 0-60 cm soil layer of Spartina alterniflora wetland in September and November 2016 was 1.49 g / kg ~ (-1) 路kg ~ (-1) respectively, and the mean value of available sulfur in soil was 651.56 mg / kg ~ (69) mg 路kg ~ (-1) 路kg ~ (-1). It can be seen that the total sulfur content of soil decreased in 2016, while the content of available sulfur in soil increased. (4) in 2015, the total sulfur content of soil in Jiaozhou Bay Spartina alterniflora Wetland showed that the content of soil total sulfur decreased first and then increased then decreased with the change of four seasons. The available sulfur content of soil increased first and then decreased with the change of four seasons. The content of total sulfur and available sulfur in soil decreased gradually with the change of four seasons. In 2016, the content of total sulfur in soil of Spartina alterniflora wetland in Jiaozhou Bay changed with the month, the lowest in June and the highest in September. The content of available sulfur in soil was also the lowest in June, and there was no significant difference in the content of available sulfur in September, October and November. The content of available sulfur in soil decreased gradually with the change of month, the highest in June and the lowest in November. (5) each organ of Spartina alterniflora had different accumulative ability to the same element. The content of total sulfur in each organ of Spartina alterniflora was different in 2015. The content of total sulfur in the organs of Spartina alterniflora in 2015 was root and leaf stem. In 2016, the content of total sulfur in each organ of Spartina alterniflora was approximately: rhizome of leaf. (6) influence of sulfur content in soil of Spartina alterniflora wetland in Jiaozhou Bay The main factors contributing to the change of nutrient content are: soil organic matter, Soil pH, soluble salt content. Soil organic matter, soluble salt content and soil sulfur content were significantly positive correlation (P0.01), soil pH and its extremely significant negative correlation (P0.01).
【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：Q948.1

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