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

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

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DOI：10.7606/j.issn.1000-7601.2009.01.04

Key Words: soil in protected field soil salinization soil acidification

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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Abstract:

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.