鄂西植烟土壤磷素形态分布特征研究

Distribution characteristics of phosphorus forms in tobacco growing soil in Western Hubei

采用调查研究的方法,通过对鄂西优质烟田土壤样品的磷素形态进行分析,比较不同速效磷、pH、有机质条件下土壤磷素形态特征分布。结果表明,根据恩施州植烟土壤最适养分标准,植烟土壤pH、有机质、碱解氮都属于中等水平,而速效磷和速效钾则比较丰富。pH与氢氧化钠-总磷、氢氧化钠-无机磷呈现显著的负相关,而与盐酸-无机磷呈现出极显著的正相关。随着pH的增加,土壤速效磷含量逐渐降低,但是差异不显著,说明土壤酸化会导致速效磷的富集。随着速效磷水平的提高,水溶性浸提磷、碳酸氢钠浸提磷、氢氧化钠浸提磷、盐酸浸提磷和残渣磷含量均逐渐增加。随着速效磷的增加,土壤中的总磷含量也逐渐增加。

Using the method of investigation and research,the morphological characteristics and distribution of soil phosphorus under different available phosphorus,pH and organic matter were compared,through the analysis of phosphorus forms of high-quality tobacco field soil samples in Western Hubei. The results showed that according to the optimal nutrient standard of tobacco planting soil in Enshi Prefecture,the pH value,organic matter and alkali hydrolyzable nitrogen of tobacco planting soil were at the medium level,while the available phosphorus and potassium were relatively rich. PH value had a significant negative correlation with sodium hydroxide total phosphorus and sodium hydroxide inorganic phosphorus,while it had a very significant positive correlation with hydrochloric acid inorganic phosphorus. With the increase of pH value,the content of soil available phosphorus gradually decreased,but the difference was not significant,indicating that soil acidification would lead to the enrichment of available phosphorus. With the increase of available phosphorus level,the content of water-soluble,sodium bicarbonate extraction,sodium hydroxide extraction,hydrochloric acid extraction and residual phosphorus increased gradually. With the increase of available phosphorus,the content of total phosphorus in soil gradually increased.