干旱区生态环境知识资源中心(Arid): 不同含盐量土壤可溶性无机碳及盐基离子的剖面分布特征

Arid

	不同含盐量土壤可溶性无机碳及盐基离子的剖面分布特征
其他题名	Profile distribution characteristics of dissolved inorganic carbon and base ions in different salt content soils
	白曙光; 焦燕; 温慧洋; 谷鹏; 杨洁
来源期刊	地球环境学报
ISSN	1674-9901
出版年	2018
卷号	9 期号:4 页码:348-355
中文摘要	为了探究干旱区盐碱土壤可溶性无机碳的动态分布特征,选取内蒙古河套灌区7种不同电导率土壤的0 100 cm剖面,采用临近样地,随机布点的方法,研究该地区土壤可溶性无机碳和盐基离子的剖面分布规律。结果表明:土壤含盐量对可溶性无机碳含量及盐基离子含量具有重要影响,不同含盐量土壤(S1 S7)的可溶性无机碳平均含量随电导率的增加而逐渐降低;随土壤深度的加深呈先减小后增加,表现为浅层0 50 cm含量少,深层50 100 cm含量聚积;可溶性无机碳储量随电导率的增加而逐渐降低。不同含盐量土壤(S1 S7)盐基离子含量随电导率的增加而增加;随土壤深度的加深盐基离子含量逐渐减少,具有较强的表聚性。研究区域土壤盐基离子组成以Ca~(2+)、SO_4~(2-)为主,平均含量分别占离子总量的27%和29%;K~+、Mg~(2+)含量较少,平均含量分别占离子总量的13%和7%。通过相关性分析,土壤可溶性无机碳含量与EC呈显著负相关(R~2 = 0.83,p < 0.05),与pH无显著相关性(R~2 = 0.17, p > 0.05),盐基离子平均含量与EC呈显著正相关(R~2 = 0.85,p < 0.05),与pH无显著相关性(R~2 = 0.07, p > 0.05),表明土壤EC的增加会影响可溶性无机碳和盐基离子的聚积。
英文摘要	Background, aim, and scope The inorganic carbon balance process of CO_2(g)-CO_2(aq) -HCO_3~-(aq)- CaCO3(s) is prevalent in saline-alkali soil, and its dynamic process dominates the inorganic carbon exchange of the ground-gas interface, which also controls the fi xation and leaching of the soil inorganic carbon. Soil dissolved inorganic carbon (SDIC) is an active dynamic carbon, which is an important mechanism of soil interception of inorganic carbon. In the current study of soil inorganic carbon, it has been concentrated in non-salt soils like farmland, plains, plateau, deserts soil carbonate content and carbon reserves estimation and different ways of land use on soil inorganic carbon content. There are few studies on inorganic carbon in saline soil, and mainly concentrated in the soil of single salinization in Xinjiang region, but not much in the northern saline-alkali soil inorganic carbon. The study site is located in Hetao Irrigation District of Inner Mongolia, due to its special geographical location and climatic conditions, the soil salinization degree is high and the salinization area is large. In order to explore the saline soils in arid areas with different soil soluble salt content on the dynamic distribution characteristics of inorganic carbon, select 7 kinds of saline soil to study the profi le distribution of soil dissolved inorganic carbon and base ions using the method of random points in this area. Materials and methods The soil samples ware collected at a distance of close to the bare ground with different EC by the soil auger in depth from 0 100 cm in late August 2016. The soil samples of the same soil layer were collected three times, and the soil samples obtained from the soil samples were fully mixed, and the soil samples were obtained with 42 soil samples in total. The litter on surface of the ground has been removed before sampling. Samples are dried under a natural ventilation indoor, and the grits with the diameter more than 2 mm are removed as well as roots and debris. The treated soil is used to determine soil physicochemical properties, soil salt content, soil dissolved inorganic carbon and soil organic matter. Results (1) The increase of dissolved inorganic carbon content in soil with different salinity is decreasing. As the depth of soil increases, the content of dissolved inorganic carbon decreases first and then increases, which is low in the shallow layer of 0 50 cm, and the content of deep 50 100 cm is accumulated. (2) The content of soil salinity with different salt content increases with the increase of conductivity. As the depth of soil deepens, the content of salt-base ions decreases gradually, and it has strong table cohesion. The composition of soil salt-base ions in the study area was composed of Ca~(2+) and SI_4~(2-) mainly, with an average content of 27% and 29% respectively. The content of K~+ and Mg~(2+) is relatively small, with the average content accounting for 13% and 7% of the ions. (3) Correlation analysis showed that soil dissolved inorganic carbon content and EC has signifi cant negative correlation, and no signifi cant correlated to the pH, base ions average content and EC has signifi cantly positively correlation, and no signifi cant correlated to the pH. Discussion (1) It can enhance that leach action of soil under certain condition of salinity, and accelerate the leaching of dissolved inorganic carbon in the soil. The solubility of the saline-alkali soil solution to CO_2 is high.
中文关键词	盐碱土壤 ; 可溶性无机碳 ; 盐基离子 ; 剖面分布
英文关键词	salinization soil soil dissolved inorganic carbon base ions profi le distribution
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:6321126
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/237438
作者单位	内蒙古师范大学化学与环境科学学院, 呼和浩特, 内蒙古 010022, 中国
推荐引用方式 GB/T 7714	白曙光,焦燕,温慧洋,等. 不同含盐量土壤可溶性无机碳及盐基离子的剖面分布特征[J],2018,9(4):348-355.
APA	白曙光,焦燕,温慧洋,谷鹏,&杨洁.(2018).不同含盐量土壤可溶性无机碳及盐基离子的剖面分布特征.地球环境学报,9(4),348-355.
MLA	白曙光,et al."不同含盐量土壤可溶性无机碳及盐基离子的剖面分布特征".地球环境学报 9.4(2018):348-355.