Lettl A, Langkramer O, Lochman V
Folia Microbiol (Praha). 1981;26(2):158-63. doi: 10.1007/BF02927374.
Some factors influencing the oxidative activity of upper horizons of spruce forest soils (a mixture of fermentative and humus layers) toward intermediates of the oxidative part of the sulphur cycle were investigated. Preincubation of the soil with added cysteine, sulphide, elemental sulphur or thiosulphate was found to stimulate enzyme systems oxidating any of these compounds. Sulphite and sulphate were ineffective in this respect. The oxidation of elemental sulphur was stimulated by CaCO3, technical urea and high doses of superphosphate and potassium sulphate. It was inhibited by KH2PO4, pure urea, 40 % potassium salt, ammonium nitrate with calcium carbonate and the fertilizer NPK I. It proceeded at the highest rate at approximately 60 % capillary capacity (61 % of mass water content). Oxidation of thiosulphate was stimulated by KH2PO4, pure urea, superphosphate, potassium sulphate and only slightly by the fertilizer NPK I. It was inhibited by CaCO3, 40 % potassium salt and only slightly by ammonium nitrate with calcium carbonate. Potassium chloride, glucose and technical urea were without effect. The oxidation proceeded at the highest rate at 35 % maximal capillary capacity (48 % mass water content).
研究了一些影响云杉林土壤上层（发酵层和腐殖质层的混合物）对硫循环氧化部分中间产物氧化活性的因素。发现土壤与添加的半胱氨酸、硫化物、元素硫或硫代硫酸盐预培养能刺激氧化这些化合物中任何一种的酶系统。亚硫酸盐和硫酸盐在这方面无效。元素硫的氧化受到碳酸钙、工业尿素以及高剂量过磷酸钙和硫酸钾的刺激。它受到磷酸二氢钾、纯尿素、40%钾盐、硝酸铵与碳酸钙以及肥料NPK I的抑制。在约60%毛管持水量（质量含水量的61%）时氧化速率最高。硫代硫酸盐的氧化受到磷酸二氢钾、纯尿素、过磷酸钙、硫酸钾的刺激，仅受到肥料NPK I的轻微刺激。它受到碳酸钙、40%钾盐的抑制，仅受到硝酸铵与碳酸钙的轻微抑制。氯化钾、葡萄糖和工业尿素没有影响。氧化在35%最大毛管持水量（质量含水量的48%）时速率最高。
