风化煤改变黄河三角洲盐渍化土壤溶液组分的过程

doi:10.11766/trxb201801110032

CORC > 烟台海岸带研究所 > 中国科学院烟台海岸带研究所 > 中科院海岸带环境过程与生态修复重点实验室 > 近岸生态与环境实验室

	风化煤改变黄河三角洲盐渍化土壤溶液组分的过程
	王洁 ; 校亮 ; 毕冬雪 ; 韦婧 ; 袁国栋
刊名	土壤学报
	2018-09-11
卷号	55 期号:06 页码:1367-1376
关键词	盐渍土改良风化煤钠吸附比氯硫比减钠脱盐
ISSN号	0564-3929
DOI	10.11766/trxb201801110032
其他题名	Processes of Leonardite Altering Cation and Anion Composition of Soil Solution in Salt-affected Soil in the Yellow River Delta
产权排序	(1)中国科学院烟台海岸带研究所 ; (2)中国科学院大学 ; (3)肇庆学院环境与化学工程学院
英文摘要	【Objective 】To ameliorate salt-affected soil in the Yellow River Delta for productive use is of great social and economic significance to the region. Trials have been conducted to use leonardite as a soil amendment for the purpose, but failed to get consistent results and probe in-depth into the causes. This research aimed to assess changes in salt composition of the soil solution in the salt-affected soil applied with leonardite, and reveal processes and mechanisms of the changes.【Method 】Three topsoil samples(S1, S2 and S3), different in salt contents(1.0,7.5, and 35.3 mg·g~(-1), respectively), were collected from a farmland in the Yellow River Delta. After being air dried and gently ground to pass a 100-mesh sieve, the samples were mixed, separately, with leonardite at 0%,1%, 3%, and 5% in dosage and each treatment had two replicates. Then the mixtures were prepared separately into suspensions(solid: water = lg: 5 ml), which were shaken at 300 r·min~(-1) for 7 d and then centrifuged at 3 000 r·min~(-1) for 10 min. The obtained supernatants(or soil extracts) went through a 0.45-µm filter and got ready for analysis of Ca~(2+), Mg~(2+), K+, Na~+, Cl~-, NO_3~-, and SO_4~(2-) with ion chromatography. The leonardite used in the experiment was digested by HNO_3-HCIO_4-HF for analysis of Ca~(2+), Mg~(2+), K~+,and Na~+, and its carboxyl and phenolic hydroxyl groups were determined with the titration method of the International Humic Substances Society.【Result 】The leonardite was found to contain Na~+(1.66 mg·g~(-1)), K~+ (1.07 mg·g~(-1)), Ca~(2+)(19.97 mg·g~(-1)), Mg~(2+)( 1.60 mg·g~(-1)),carboxyl group(2.74 mol·kg~(-1)) and phenolic hydroxyl group(1.63 mol·kg~(-1)). In the soil solution, sodium adsorption ratio(SAR) decreased with leonardite increasing in spiking dosage, which was attributed to Ca~(2+) release from and Na~+ adsorption to leonardite. In the treatment of adding 5% leonardite to soil S2 SAR reduced from 7.81 to 6.61. In analogy to SAR, Cl~-/SO_4~(2-) molar ratio was proposed as a new indicator to reflect changes in anion compositions. It decreased from 10.20 to 8.25 in the treatment, which was a result of SO_4~(2-) release from and/or Cl~- retention by leonardite. The reduction of SAR and Cl~-/SO_4~(2-) ratio suggests that leonardite could lessen the toxic effects of Na~+ and Cl~- on plants.【Conclusion 】With Ca~(2+) and abundant carboxyl groups it contains, leonardite could alter ion compositions in soil solution via: 1) ion exchange between Ca~(2+) in leonardite and Na~+ in soil solution, reducing Na~+ concentration in the solution and its harmful effect; 2) replacement of Na~+ adsorbed on soil colloids by Ca~(2+) released from leonardite, favoring formation of soil aggregates and leaching of Na~+; and 3 ) formation of complexes of Na~+ in solution with organic substances dissolved from leonardite, reducing Na~+ activity and toxicity. It is, therefore, proposed that SAR and Cl~-/SO_4~(2-) ratio be tested as indicators for fast laboratory assessment of suitability of soil amendments for use in salt-affected soils, which would help land managers choose proper soil amendments for use and avoid input of Na-rich organic materials, such as sodium humate, in salt affected soils.
语种	中文
CSCD记录号	CSCD:6385782
资助机构	国家重点研发计划项目#2016YFD0200303 ; 山东省重点研发计划项目#2016CYJS05A01-1
内容类型	期刊论文
源URL	[http://ir.yic.ac.cn/handle/133337/24683]
专题	烟台海岸带研究所_近岸生态与环境实验室烟台海岸带研究所_污染过程与控制实验室
作者单位	1.中国科学院烟台海岸带研究所; 2.肇庆学院环境与化学工程学院 3.中国科学院大学;
推荐引用方式 GB/T 7714	王洁,校亮,毕冬雪,等. 风化煤改变黄河三角洲盐渍化土壤溶液组分的过程[J]. 土壤学报,2018,55(06):1367-1376.
APA	王洁,校亮,毕冬雪,韦婧,&袁国栋.(2018).风化煤改变黄河三角洲盐渍化土壤溶液组分的过程.土壤学报,55(06),1367-1376.
MLA	王洁,et al."风化煤改变黄河三角洲盐渍化土壤溶液组分的过程".土壤学报 55.06(2018):1367-1376.