华南红树林湿地表层土壤有机碳分布特征及其影响因子

发布时间：2018-06-06 03:04

本文选题：红树林湿地 + 有机碳　；参考：《广西师范学院》2017年硕士论文

【摘要】：气候变化是全球关注的重大问题,而二氧化碳的过量排放是导致全球气候变暖的重要原因。本文重点研究华南地区红树林表层土壤有机碳,探讨该地区红树林湿地表层土壤有机碳分布特点以及影响有机碳分布的主要因子。本研究将华南地区按广东、海南、广西划分调查区域,选取了白骨壤群落、无瓣海桑群落、白骨壤群落+桐花树群落、红海榄+白骨壤群落、白骨壤+桐花树+红海榄群落、红海榄群落、海桑群落、正红树群落、桐花树群落等9种群落,用环刀法以10cm为一层采集红树林群落林下0-30cm土壤,测定所在区域海水pH值、盐度、温度、溶解氧、电导率等海水基本要素,并通过室内实验测定土壤有机碳含量,土壤容重、孔隙度、含水率等土壤理化指标,计算土壤有机碳密度、碳储量。利用SPSS 17.0和Excel 2010处理数据并进行相关性分析和方差分析。比较华南红树林湿地表层土壤有机碳含量、有机碳密度、有机碳储量在不同种红树植物群落以及不同区域中的垂直分布特征,分析土壤理化性质、纬度梯度、红树植物、人为干扰对土壤有机碳含量产生的影响。研究结果表明:1、华南三省红树林表层土壤(0-30cm)有机碳含量介于为:0.91~103.42 g/kg,平均含量为18.67 g/kg,变异系数极高(0.82);有机碳密度平均值为:1.68 kg/m~2;估算华南地区红树林湿地表层土壤(0-30cm)有机碳储量为50.53 t/hm~2;2、不同地区的红树林湿地表层土壤(0-30cm)有机碳含量大小为:海南(25.03 g/kg)广西(15.78 g/kg)广东(15.20 g/kg);3、华南红树林表层土壤有机碳含量随着土壤深度的增加而升高的垂直分布趋势,20-30cm10-20cm0-10cm,结果分别为:19.66 g/kg、18.32 g/kg、18.05 g/kg;4、不同植物群落的红树林表层土壤有机碳含量大小排序为无瓣海桑群落(22.27 g/kg)白骨壤+桐花树群落(22.19 g/kg)红海榄群落(21.67 g/kg)正红树群落(21.38 g/kg)白骨壤+红海榄+桐花树群落(20.51 g/kg)海桑群落(19.24 g/kg)白骨壤群落(15.63g/kg)桐花树群落(10.87g/kg);5、华南滨海红树林表层土壤有机碳密度分布:海南(2.18 kg/m)广西(1.55 kg/m)广东(1.32 kg/m~2)。土壤有机碳密度垂直分布呈先增后减的趋势,10-20cm0-10cm20-30cm,结果分别为:1.81 kg/m~2、1.65kg/m~2、1.59 kg/m~2;6、纬度梯度是影响华南地区红树林表层土壤有机碳含量区位分布的重要因素;7、红树植物群落的凋落物是华南地区红树林土壤有机碳含量群落分布差异的重要因素;8、土壤容重与土壤有机碳含量之间呈极显著负相关(p0.01)(y=-25.87x+45.274,R~2=0.357),土壤孔隙度、土壤含水率与土壤有机碳含量之间呈极显著正相关(p0.01)公式分别为(y=2.1188e0.0331x,R~2=0.421)(y=2.0311x+30.273,R~2=0.5217)。
[Abstract]:Climate change is a major global concern, and excessive carbon dioxide emissions are a major cause of global warming. In this paper, the distribution characteristics of soil organic carbon in mangrove wetland and the main factors affecting the distribution of organic carbon were discussed. In this study, the investigation areas in South China were divided according to Guangdong, Hainan and Guangxi. White bone soil community, non-petal sea mulberry community, white bone soil community, red sea elm community were selected. Nine communities, such as red sea elm community, sea mulberry community, mangrove community and tung flower tree community, were collected from 0-30cm soil under mangrove community by 10cm method. The pH value, salinity, temperature and dissolved oxygen of seawater in the region were measured. Soil organic carbon density and carbon storage were calculated by measuring soil organic carbon content, soil bulk density, porosity, moisture content and other soil physical and chemical indexes. The data were processed by SPSS 17.0 and Excel 2010, and the correlation analysis and variance analysis were carried out. The soil organic carbon content, organic carbon density and organic carbon storage in the surface soil of mangrove wetland in South China were compared in different mangrove communities and different regions. The soil physical and chemical properties, latitude gradient and mangrove plants were analyzed. Effects of anthropogenic interference on soil organic carbon content. The results showed that the content of organic carbon in the top layer of mangroves in the three provinces of South China ranged from 0 to 30 cm 路kg ~ (-1), with an average content of 18.67 g / kg and an average of 18.67 g / kg, with a very high coefficient of variation of 0.82g / kg; the average organic carbon density was 1. 68 kg / m ~ (-2); the estimation of the surface soil of mangrove wetlands in South China was 0-30 cm). The organic carbon storage is 50.53 t / hm ~ (2) ~ (2), and the content of organic carbon in the surface soil of mangrove wetland in different areas is: Hainan (25.03 g / kg), Guangxi (15.78 g / kg) Guangdong Province (15.20 g / kg ~ (-3). The soil organic carbon content in the top layer of mangrove in South China increases with the increase of soil depth. The vertical distribution trend was 20-30 cm 10-20 cm 0-10 cm, and the results were: 1 19.66 g / kg ~ 18.32 g / kg ~ 18.05 g 路kg ~ (-1) 路kg ~ (4). The order of soil organic carbon content of mangrove community in different plant communities was 22. 27 g / kg (n = 22. 27 g / kg). The floral community of Paulownia alpingoides was 22.19 g / kg) and the mangrove community was 21. 67 g / kg). The distribution of organic carbon density in the surface soil of mangrove in southern China is 10.87 g / kg 路kg ~ (5). The distribution of organic carbon density in the surface soil of mangroves in southern China is 2.18 kg / m) 1.55 kg / m in Guangxi. The vertical distribution of soil organic carbon density increased first and then decreased. The results were as follows: 1.81 kg 路m ~ (-1) 路m ~ (2 +) = 1.65 kg / m ~ (2) ~ 2.59 kg / m ~ (2) ~ (2). Latitude gradient was an important factor influencing the location distribution of soil organic carbon content in mangrove topsoil in South China, and the litter of mangrove plant community was 7kg 路m ~ (-1) ~ (-1) 路m ~ (-1) 路m ~ (-1), respectively. Soil organic carbon content in mangroves in South China is an important factor, and soil bulk density is negatively correlated with soil organic carbon content. There was a significant positive correlation between soil moisture content and soil organic carbon content.
【学位授予单位】：广西师范学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S714.2

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