天津小站稻种植区土壤主要微量营养元素的有效量及其影响因素

土壤调查研究表明，天津小站稻种植区土壤的微量元素全量中，Fe、Mn、Zn、S丰富，Cu中等，B、Mo和Se偏低；有效态含量中，Fe、Cu、Mn、S丰富，Zn和B中等偏上，较普遍缺Se，少部分土壤缺Mo。Cu、Mn、B、Mo、Se和S的有效量受全量的影响较大，Fe和Zn的有效量与其全量相关性不明显。Cu、Fe、Mo、Se、S和Mn的有效量受有机质含量的影响显著，pH对Mn和Se有效量的影响明显，水溶性盐含量与Fe、B和S呈显著正相关。天津稻田土壤需要针对性施用微肥、配施有机肥并适当调理土壤酸碱度。本研究对于稻田土壤改良和水稻品质提升具有重要理论与实用价值。

Available Contents of Microelements and Factors Influencing Their Availability in Soils of Tianjin Xiaozhan Rice Planting Area

The investigation on soil microelements in Tianjin Xiaozhan Rice Planting Area found that the total contents of Fe, Mn, Zn and S were in the high levels while B, Mo and Se were in the low levels; The available contents of Fe, Cu, Mn and S were greater than their critical values, Mo was in the medium level, whereas Se was in the low level. Correlation analysis found positive correlation existed between the total and available contents of Cu, Mn, B, Mo, Se and S except for Fe and Zn. Significant correlation was found between organic matter with available Cu, Fe, Mo, Se, S and Mn, pH played an important role in changing the availabilities of Mn and Se, and there was significantly positive correlation between water soluble salts with Fe, B and S. For paddy soil in Tianjin, it is necessary to apply microelement fertilizers combined with organic fertilizer and properly regulating soil pH. This study can provide important theoretical and practical instructions for the improvement of paddy soil and rice quality.