论文部分内容阅读
通过研究江门市都斛、牛江、宅梧3个优质稻产地土壤Se的空间分布规律及其与指示不同物质来源的特征元素组合的相互关系,得出土壤Se来源于陆相沉积,其中基性物源对土壤硒的贡献率大于花岗岩物源.Se的7种形态中,强有机态Se和腐殖酸态Se均占全量的一半以上,且此2种形态与全量间相关系数高,说明土壤中Se的富集与有机质的活动密切相关.硒在水稻植株根、茎、叶、谷壳、米粒中的分布、迁移和总量传输,是一个动态过程.从土壤和根部传输上来的硒会逐渐在各器官内积累,浓集系数大小顺序表现为C茎-谷壳,C土-根,C茎-米,C根-茎的特点.水稻在地面以上部分的硒量不足植株总硒量的50%.高硒区土壤总硒与土壤有机态硒和残渣态硒有关,硒的含量、形态明显受土壤pH、Eh和有机质含量影响.
By studying the spatial distribution of Se in soils from Dushu, Niujiang and Zhawu, Jiangmen, and the relationship between Se and the characteristic elements that indicate the origin of different materials, it is concluded that Se is derived from terrestrial sediments, The contribution rate of sexual provenance to selenium in the soil is greater than that of the granite source.Se 7 kinds of morphology, strong organic Se and humic acid Se accounted for more than half of the total, and the correlation between the two forms and the total amount of high, It is concluded that the accumulation of Se in soil is closely related to the activity of organic matter.The distribution, migration and total amount of selenium in the root, stem, leaf, chaff and rice of rice plants are a dynamic process. Selenium gradually accumulates in various organs, and the order of the concentration coefficient is C stem - chaff, C soil - root, C stem - rice and C - stem. Selenium content of 50% .Selenium in high-selenium soil total organic selenium and residual soil selenium content, selenium content, morphology was significantly affected by soil pH, Eh and organic matter content.