Soil labile organic carbon is involved in all biological and biochemical processes in soil , the minor change of loc can be detected before the content of total organic carbon ( toc ) in soil has changed , although it accounts for small fraction of toc 土壤活性碳直接参与了土壤生物化学转化过程,虽然只占土壤全碳的较小部分,但它们可以在土壤全碳变化之前反映土壤微小的变化。
However , although prechlorination efficiently removed algae , its effect was directly related to the quantity of algae and was more obvious in the period of algae bloom . with regard to yellow river water in winter with low temperature and low turbidity , it was discovered that preozonation did not result in a substantial removal of total organic carbon ( toc ) , but a remarkable uv254 . it was further revealed that preozonation changed the characteristics and structure of organic matters and then enhanced removal efficiencie s of them by subsequent processes 对于夏季高藻期水质,高锰酸钾预氧化对有机物有一定的去除能力,并能提高后续工艺出水水质;预氯化能显著去除藻类,但后续工艺出水水质受藻类数量影响明显,预氯化只有在高藻期才能提高后续常规处理工艺出水水质;对于冬季低温低浊水,预臭氧化虽不能降低水中有机物浓度,但能显著提高后续常规处理单元出水水质。
The main results are following : ( 1 ) the variation of clay / silt ratio can indicate the secondary clay action of dust depositions ; the variations of magnetic susceptibility and total fe content are inferred to be records of the changeable intensity of bio - pedogenesis ; the variations of sr content and rb / sr ratio can indicate bio - pedogenesis , dissolving and leaching action ; the content of total organic carbon ( toc ) can reflect variation of climate and vegetation during soil formation , it indicates the intensity of weathering and bio - pedogenesis ; the content variation of caco3 can show the intensity of dissolving - leaching action and secondary deposit , which was noted as pseudomycilia in pores and fissures in the sediment , so it can indicate the intensity bio - pedogenesis quite well . these proxy indexes also reflect obvious regional difference of pedogenic environment and the intensity bio - pedogenesis ; namely , secondary clay action , dissolving - leaching action and bio - pedogenesis are all much stronger in south than that in north 实验结果表明:粘粒粉沙比值能很好地指示粉尘堆积物的次生粘化作用;磁化率和全铁很好地指示生物风化成壤作用; sr和rb sr比值能很好的指示生物风化成壤作用和淋溶作用;总有机碳( toc )含量的高低,在一定程度上反应了土壤发育过程中气候和植被状况的变化,指示着成壤过程中腐殖质化的程度; caco3含量的变化,可以反映了黄土古土壤形成时的风化成壤作用的强弱程度,指示成壤过程中的淋溶作用和次生碳酸盐化作用;并且各指标所指示的成壤环境和成壤强度存在明显的区域差异,即渭河流域土壤的生物风化成壤作用、次生粘化作用和淋溶作用均表现出南部强于北部。