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首页> 外文期刊>Soil Science Society of America Journal >Soluble and Solid Organic Matter Effects on Atrazine Adsorption in Cultivated Soils
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Soluble and Solid Organic Matter Effects on Atrazine Adsorption in Cultivated Soils

机译：可溶性和固体有机物对土壤中At去津吸附的影响

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摘要

Soil organic matter can be divided into solid (SOM) and water-dissolved (DOM) fractions; both of which can associate with herbicides. The objective was to examine the effects of DOM in applied solutions on atrazine adsorption in soil containing various SOM contents. A sandy loam with low (0.14%, Soil L), medium (1.2%, Soil M), or high (6.7%, Soil H) total organic matter, and artificial soil (Soil A) with no organic matter were used. These soils were treated with several different atrazine concentrations, dried, and extracted with water; the DOM concentrations in these extracts were 0, 10.1, 41.1, and 156.5 mg L-1, respectively. These extracts and the untreated soils were used in batch experiment. The distribution coefficients (Kd) for atrazine of Soils L, M, and H under mixing with Soil A extract were 0.19, 0.52, 2.51, respectively, indicating that the higher the SOM content, the higher the atrazine affinity to the soil solid phase. The effects of the DOM concentration on atrazine adsorption were estimated from the ratios (Rd) between the Kd for applied solution with no DOM and those for applied solutions containing DOM. Rd > 1 indicates that the DOM decreases the herbicide adsorption. The Rd values for Soils L, M, and H, each soil mixed with its extract, were 2.68, 1.93, and 1.07, respectively. In contrast, in the case where the soil was mixed with a solution that contained a higher DOM concentration than the soil extract, an increase in the DOM concentration in the applied solution decreased the Rd value. This was probably because of adsorption of DOM-atrazine complexes on the SOM.
机译：土壤有机质可分为固体（SOM）和水溶性 （DOM）馏分。 目的是研究施用溶液中DOM对含有不同SOM含量的土壤中r去津吸附的影响。 >一种砂壤土，其总有机质含量低（0.14％，土壤L），中等（1.2％，土壤M）， 或高（6.7％，土壤H），并且人工 用几种不同的阿特拉津浓度处理， 干燥，并用水提取；这些 提取物中的DOM浓度分别为0、10.1、41.1和156.5 mg L -1 。 这些提取物和未处理的土壤分别为 与土壤A提取物混合后，土壤L， 和H的阿特拉津的分配系数（K d ）为分别为0.19、0.52、2.51， ，表明SOM含量越高，the去津对土壤固相的亲和力越高。根据K d 之间的比率（R d ）估算 DOM浓度对at去津吸附的影响。适用于 不包含DOM的应用解决方案以及包含DOM的应用解决方案。 R d 1表示DOM降低了除草剂的吸附。 土壤L，M的R d 值和H，分别与 提取物混合的每种土壤分别为2.68、1.93和1.07。相反，在 的情况下，如果将土壤与DOM浓度高于提取液的 溶液混合，则 会增加。施用溶液中的DOM浓度降低了 R d 值。这可能是由于DOM-阿特拉津 复合物在SOM上的吸附。

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    《Soil Science Society of America Journal》 |2003年第4期|1140-1146|共7页
  • 作者

    M. Ben-Hur; J. Letey; W. J. Farmer; C. F. Williams; S. D. Nelson;

  • 作者单位

    Inst. of Soils, Water, and Environmental Sci., ARO, Volcani Center, P.O.B. 6 Bet Dagan, Israel 50250,Univ. of California, Dep. of Soil and Environmental Sci., Riverside, CA 92521-0424;

    Inst. of Soils, Water, and Environmental Sci., ARO, Volcani Center, P.O.B. 6 Bet Dagan, Israel 50250,Univ. of California, Dep. of Soil and Environmental Sci., Riverside, CA 92521-0424;

    Inst. of Soils, Water, and Environmental Sci., ARO, Volcani Center, P.O.B. 6 Bet Dagan, Israel 50250,Univ. of California, Dep. of Soil and Environmental Sci., Riverside, CA 92521-0424;

    Inst. of Soils, Water, and Environmental Sci., ARO, Volcani Center, P.O.B. 6 Bet Dagan, Israel 50250,Univ. of California, Dep. of Soil and Environmental Sci., Riverside, CA 92521-0424;

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