| 摘要: |
| 通过引水冲刷的办法，研究冲水洗盐对盐碱地盐分因子的时空变化，本文选取盐碱地重灾区唐山作为研究样点，采用野外采样与室内分析相结合的方法，对样点土壤的盐碱度进行分析。对土壤的阴阳离子和生态离子之间的相关性进行分析。结果表明：随着冲洗的次数增多，土壤中SAR值 (P﹤0.05)、PH值(P﹤0.05)都呈逐渐下降趋势，秋季为返盐期盐碱因子小幅增加，最低值分别为2.60 mmol l-1和7.40；盐度(P﹤0.05)含量随着月份的增加而增加，10月份最大为8.30‰；EC(P=0.05)和TDC(P﹤0.05)呈先减小后增加的趋势，上、中、下三层土在不同月份中存在差异性的变化。本实验盐碱离子主要是Na+、CL-构成，含量依次为CL-﹥Na+﹥Mg2+﹥SO42-﹥Ca2+﹥HCO3-﹥K+﹥CO32-，SAR与Na+呈极显著正相关性，减少土壤中Na+的含量对治理盐碱地具有极大的作用，为盐碱地治理提供科学依据。 |
| 关键词: 盐碱土壤；引水冲洗；盐分离子；滨海盐碱地 |
| DOI： |
| 分类号:X53? |
| 基金项目: |
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| Effect of washing salt by washing water on salinity variation in coastal saline and alkaline land |
|
Zhu Guangyan1,2
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1.Freshwater Fisheries Research Center of ChineseAcademy of Fishery Sciences;2.China
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| Abstract: |
| Through the method of water diversion and scour, the temporal and spatial changes of salt factors in saline and alkaline land were studied. In this paper, tangshan, the hardest-hit area of saline and alkaline land, was selected as the study sample to analyze the salinity of soil in the sample point by combining field sampling and indoor analysis.The results showed that with the increase of washing times, the median SAR value (P ﹤0.05) and PH value (P ﹤0.05) of the soil presented a gradually decreasing trend.Salinity (P ﹤0.05) increases with the increase of month, the maximum salinity is 8.30‰ in October.EC(P=0.05) and TDC(P 0.05) show a trend of decreasing and then increasing, while the upper, middle and lower layers show different changes in different months.The salt and alkali ions in this experiment mainly consist of Na+ and CL-, the content of which, in turn, is CL-﹥Na+﹥Mg2+﹥SO42-﹥Ca2+﹥HCO3-﹥K+﹥CO32-, SAR and Na+ showed a very significant positive correlation, and the reduction of Na+ content in soil had a great effect on the treatment of saline-alkali land, providing a scientific basis for the treatment of saline-alkali land. |
| Key words: Saline-alkali soil; Water flush; Salt ions; Coastal saline and alkaline land |
