不同改良剂对苏打碱土磷有效性影响的研究

Study on Effect of Using Three Soil Conditioners to Phosphorus Validity of Soda-alkali Soil

通过室内培养及玉米盆栽土培模拟试验,采用完全随机区组设计,研究了在山西省大同市山阴县西盐池的苏打碱土上,施用DS-1997、脱硫石膏、风化煤对土壤速效磷含量的影响。研究结果表明:(1)3种改良剂均可降低苏打碱土的pH值;(2)脱硫石膏改良苏打碱土的作用最明显地反映于土壤水溶性盐分的急剧上升,同时伴随着土壤中速效磷含量的急剧下降,因此,脱硫石膏抑制土壤中磷的有效化作用;(3)DS-1997与其他两种改良剂相比,可以更好地增强土壤解磷细菌和碱性磷酸酶活性,增强土壤中磷的释放作用。

By cultivating indoor and planting corn in pot with Soda-alkali soil derived from Xiyanchi in Shanyin county of Shanxi province by the design method of compete random block, the experiment studied the effect of the soil phosphorus after use DS-1997, sulfur-removal gypsum, weathering-coal in soil. As were shown by the followings:(1)All of this three conditioners could decrease Soda-alkali soil pH value;(2)It showed soil EC value rapidly and the content of soil readily available phosphorus decreased after sulfur-removal gypsum was put into soil. So sulfur-removal gypsum could inhibit release of soil phosphorus;(3)DS-1997 could boost up the activity of soil decompose-phosphorus microbe, phosphate-enzyme, swell release of soil phosphorus than the other two.