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实验室培养条件下 ,研究了14 C 甲磺隆在 7种不同类型土壤中形成结合残留( 14 C BR)的规律、主要影响因子及14 C BR在腐殖质中的动态分布规律等。结果表明 :( 1 ) 14 C 甲磺隆在 7种土壤中形成的14 C BR含量在培养初期的 2 0d内与土壤pH呈显著负相关且与土壤粘粒含量呈显著正相关 ;而 2 0d后 ,14 C BR含量只与土壤pH呈显著负相关。土壤pH是14 C 甲磺隆在土壤中形成BR的主要影响因子。14 C -甲磺隆在各类土壤中的14 C BR的最大值分别占引入量的 48 5%、46 5%、52 6%、1 9 3 %、49 7%、42 0 %和 46 5% ;( 2 )在整个培养试验过程中 ,14 C 甲磺隆在 7种不同类型土壤中的14 C BR ,主要分布在富啡酸和胡敏素中 ,前者中的相对百分比大于后者 ,而在胡敏酸中的相对百分比较小。土壤中14 C 甲磺隆BR的形成过程中 ,富啡酸的作用 >胡敏素 胡敏酸
Under the laboratory culture conditions, the laws of 14 C BR formation, 14 C BR and the main influencing factors of 14 C BR in humus in 14 different types of soils were studied. The results showed that: (1) 14 C BR content of metsulfuron-methyl in 7 soils was negatively correlated with soil pH and had a significant positive correlation with soil clay content within the first 20 days of culture; The 14 C BR content was negatively correlated with soil pH only. Soil pH is the main influencing factor for the formation of BR in soil by 14 C metsulfuron-methyl. The maximum values of 14 C BR of 14 C-metsulfuron-methyl in soils accounted for 48.5%, 46.5%, 52.6%, 13.3%, 49.7%, 42.0% and 465, respectively %. (2) The 14 C BR of 14 C metsulfuron-methyl in 7 different types of soils was mainly distributed in fulvic acid and humin during the whole culture experiment, the former was higher than the latter, The relative percentage of humic acid is small. Role of fulvic acid in the formation of 14 C metsulfuron-methyl BR in soils> Humic acid, humic acid