保护地土壤盐分积累及其离子组成对土壤pH值的影响

范庆锋; 张玉龙; 陈重; 王丽娜; 娄翼来

范庆锋,张玉龙,陈重,王丽娜,娄翼来.保护地土壤盐分积累及其离子组成对土壤pH值的影响[J].干旱地区农业研究,2009,27(1):16~20

保护地土壤盐分积累及其离子组成对土壤pH值的影响

Effects of soil salinity accumul ating and ion constitution on pH in the soil of protected field

DOI：10.7606/j.issn.1000-7601.2009.01.04

中文关键词: 保护地土壤土壤盐渍化土壤酸化

英文关键词:soil in protected field soil salinization soil acidification

基金项目:辽宁省重大农业攻关项目(2006215005)；辽宁省教育厅资助项目(05L386)；辽宁省教育厅创新团队资助项目(2007T156)

作者	单位
范庆锋	College of Land and Enironmental Science, Shenyang Agricultural University，Key Open Laboratory of Northeastern Soil and Env ironment of Ministry of Agriculture, Shenyang， Liaoning 110161， China
张玉龙	College of Land and Enironmental Science, Shenyang Agricultural University，Key Open Laboratory of Northeastern Soil and Env ironment of Ministry of Agriculture, Shenyang， Liaoning 110161， China
陈重	College of Land and Enironmental Science, Shenyang Agricultural University，Key Open Laboratory of Northeastern Soil and Env ironment of Ministry of Agriculture, Shenyang， Liaoning 110161， China
王丽娜	College of Land and Enironmental Science, Shenyang Agricultural University，Key Open Laboratory of Northeastern Soil and Env ironment of Ministry of Agriculture, Shenyang， Liaoning 110161， China
娄翼来	Institute of Applied Ecology，Chinese Academy of Sciences， Shenyang, Liaoning 110016，China

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中文摘要:

在沈阳市于洪地区采集保护地土壤样品,测定土壤盐分含量、离子组成和土壤pH值,研究保护地土壤盐分积累及其与土壤pH值变化的关系。结果表明:(1)保护地土壤的盐分含量和电导率均明显高于露地土壤,露地土壤平均盐分含量为0.29 g/kg,改为保护地10年左右土壤的平均含盐量上升至1.56 g/kg,相应的电导率(EC)值达到0.53 mS/cm,已超过作物的生育障碍临界点(EC>0.50 mS/cm);(2)保护地土壤酸化趋势明显,建成保护地栽培蔬菜6年,土壤pH值从6.5降低至5.5以下,超过了蔬菜出现生理障碍的临界土壤pH值(5.52),保护地土壤酸化与土壤的次生盐渍化已成为限制当地保护地生产可持续发展的重要因素;(3)保护地土壤NO₃^-、SO₄^2-、Cl^-和Ca²⁺、Mg²⁺、K⁺、Na⁺等盐基离子含量均较露地土壤大大增加,但HCO₃^-低于露地土壤或与露地土壤持平,NO₃^-、SO₄^2-数量与土壤pH值下降关系密切,Ca²⁺、Na⁺在全盐中的相对比例下降也是导致土壤pH值下降的重要原因。

英文摘要:

The relationship of soil salinity accumulating and pH was studied by measuring salinity content，ion constitution and pH in the soil of protected field in Shenyang of Liaoning Province. The results indicated:(1) The salinity content and EC value in the soil of protected field were much higher than those in the corre-sponding open field. T he average of the salinity content w as 0.29 g/kg in open field soil and 1. 56 g/ kg in pro-tected field. Corresponding EC had exceeded the scope of that was 0.53 mS/cm. (2) Soil acidification took on a clear trend of increase after protected field had been set up, and soil pH declined from 6.5 to 5.5 six years after protected field had been set up. The pH value of 5.52 w as a critical point w hen veget ables appeared physical obstacles. (3) Apart from HCO₃^-， the content of NO₃^-， SO₄^2-，Cl^-,Ca²⁺，Mg²⁺, K⁺and Na⁺ increased significantly in protected field. The soil pH had a close relationship with the content of NO₃^- and SO₄^2-. It was an important factor that the proportion of Ca²⁺ and Na to total salts w as decreased w hich caused soil acidification.

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