酸性水稻土有效硒提取剂的比较研究

Comparative studies on available Se extractants for acid paddy soils

采集12种肥力水平和含硒量差异较大的酸性土壤,连续两季(次)用盆栽方法种植水稻,测定植株含硒量(mgkg-1)、硒累积量(mg /盆)以及7种提取剂浸提的土壤硒量,检验两者间的相关程度。结果表明,0.1 molL-1 KH2PO4浸提土壤硒的操作简便,提取量较多,与植株含硒量间有极显著的相关性,适合作稻田土壤有效硒的提取剂;0.2 molL-1 K2SO4对土壤硒的浸提量低,与植株含硒量间的相关性不显著,不适宜作水稻土有效硒的提取剂。

Rice was cultured in pots with paddy soils which were significantly different in fertility levels and Se contents in two successive planting seasons, in order to obtain correlation coefficients between Se contents of paddy soil tested by 7 extractants and Se contents of plant or Se contents absorbed by plant. The results showed that it is simple to use 0.1 molL-1 KH2PO4 to extract Se in soil and more Se could be extracted. The correlation between Se contents obtained by 0.1 molL-1 KH2PO4 and Se contents in plant reached high significant level. 0.1 molL-1 KH2PO4 was the suitable available Se extractant. On the contrary, the extracted quantity of Se in soil by 0.2 molL-1 K2SO4 was small. The correlation didn’t reach significant level. 0.2 molL-1 K2SO4 wasn’t the suitable available Se extractant for paddy soil.