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《Acta Agriculturae Jiangxi》 2014-01
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Characteristics and Causes of Acidification of Paddy Soil

LI Ai-fen;MA Wan-zhu;ZHANG Ming-kui;Nanhu Agricultural and Economic Bureau of Jiaxing City in Zhejiang Province;Institute of Dig-ital Agriculture,Zhejiang Academy of Agricultural Sciences;Institute of Soil and Water Resource & Environmental Sciences,College of Environmental and Resource Sciences,Zhejiang University;  
Taking Zhejiang province as an example,the author explored the characteristics of paddy soil acidification,and studied the rate and causes of paddy soil acidification in this province through fixed-point observation. The results indicated that soil pH-values varied mainly from 4. 50 to 6. 50,with the middle value of 5. 70. Most paddy soils were acidic. The paddy soil in Zhejiang province was significantly acidified in the past thirty years,and the proportion of soils with the pH-value of less than 5. 5 obviously increased,while that of soils with pH 5. 5 ~ 7. 5 markedly decreased as compared with those obtained in 1980s. The middle vale of soil pH-value decreased by 0. 39 unit from 1980s to 2008. The results of fixed-point observation showed that the decline of pH-value of paddy soil ranged from 0. 17 to 0. 83 unit in the past 30 years. The acidification rate revealed the following order: vegetable land mulberry garden land nursery garden land. The acidification of paddy soil was maybe caused by the increase of nitrogen fertilizer application,long-term cultivation of upland crops,and atmospheric acid deposition. The long-term planting of rice can retard the acidification of paddy soil.
【Fund】: 国家自然科学基金项目(41071145)
【CateGory Index】: S153.4;S511
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