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作 者 ：吴曦1;2;陈明昌1;2;杨治平2

期 刊 ：植物营养与肥料学报 2007年 13卷 4期 页码：671-677

关键词：碱土；硫磺；pH；有效磷；生物量；硝酸盐；油菜；

Keywords:alkaline soil, sulfur, pH, available P, biomass, NO-3N, cole,

摘 要 ：通过盆栽试验研究了不同硫磺施用量对碱性土壤pH、速效磷和磷酸酶活性以及油菜生物量、植株体内硝酸盐含量,硝酸还原酶活性和植株吸磷量的影响。研究结果表明,施用硫磺能显著降低土壤的pH值,增加土壤有效磷含量。与对照相比,施硫磺后土壤pH值最大降幅为0.5个单位。当硫磺用量为120.mg/kg时土壤有效磷含量最高,比对照增加了68.6%。对油菜生长状况的研究表明,施用硫磺能增加油菜植株生物量,降低油菜植株体内硝酸盐含量,提高硝酸还原酶的活性和植株吸磷量。施硫磺与对照相比,油菜植株生物量最大增加了29.64%,植株体内硝酸盐含量降低了58.6%,硝酸还原酶活性提高了近1.8倍,吸磷量增加了1.55倍。研究结果还显示,虽然高硫处理对土壤pH值降低具有明显的作用,但同时会也抑制油菜生长和发育。

Abstract:Pot experiment was conducted to determine the effects of sulfur application on pH,available P content and phosphatase activity of alkaline soil,cole biomass and NO₃^--N concentration,nitrate reductase activity in plants and P uptake.Results showed that soil pH was remarkably reduced,and an available P content in soil was increased greatly.Comparing to CK,the largest decrease of pH was 0.5.When the amount of the applied sulfur was 120 mg/kg,P content in soil reached the highest value,increased by 68.6% compared with CK.The experiment conducted on the growth status of cole showed that sulfur improved cole biomass,reduced the content of NO₃^--N,increased the activity of nitrate reductase and P uptake.Compared with CK,the largest biomass increase was 29.64% and the largest decrease of NO₃^--N was 58.6%.Nitrate reductase activity and P uptake were nearly 1.8 and 1.55 more than those of CK,respectively.When the amount of the applied sulfur was 120 mg/kg,the cole biomass,NO₃^--N content,nitrate reductase activity and P uptake were all in the optimum range.Meanwhile,high rate of sulfur NO₃^-——Napplication reduced pH value,but hindered the growth of cole.

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