不同浸提剂对保护地土壤有效硅测定结果的影响

北方保护地面积在不断扩大,随着种植年限增长,土壤有可能硅供应不足;充足的硅素供应对于提高保护地作物抗性、防治病虫害发生和改善产品品质具有特殊重要作用。但到目前为止,在北方旱田土壤上测定有效硅的方法还没有建立起来。自辽宁中部地区不同利用年限保护地采集不同深度土层土壤样品28个,选择几种常见的浸提剂及测定方法测定有效硅含量,通过对不同方法测定结果间的比较及测定结果与主要土壤化学性质间关系做相关分析,得出初步结论如下:不同浸提剂及测定方法测得的土壤有效硅含量相差别很大,但相关程度均达到了极显著水平;回归分析表明,几种方法测定的土壤有效硅含量主要与土壤pH、EC以及土样采集深度有关,但相关程度及相关形式不同。这一研究结果为今后深入开展研究提供了资料。

Effect of Extracted Solutions on Content of Soil Silicon in Protected Field

As the expansion of area of protected field and the increasing year of cultivation, the supply of silicon in soil is probably insufficient. Silicon plays a key role in enhancing resistance, improving fruit quality and protecting from disease and pest. So far, there is no systematic determination method of available silicon in northern glebe of China. Soil samples were collected from protected field with different cultivation year, available silicon was extracted by several convention methods and the comparison of the results and its relationship with soil chemical properties were studied. The results show that there was clear difference in content of available silicon extracted by different methods, but there was positive correlation between them. The analyses of regression show that available silicon extracted by different methods in soil was relevant with soil pH, EC and soil depth. The results will be useful for silicon research for the future.