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Study on the effects of nitrogen, glucose and plant residues on soil microbial C

机译：氮，葡萄糖和植物残留物对土壤微生物C的影响研究

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The soil microbial biomass is studied as the agent of transformation of both fresh organic inputs to soil and of native soil organic matter itself. Microbial biomass C and organic C were measured in 5 soils selected from 5 long term field cultivation at Bastam area of Shahrood region in Iran. Nitrogen, Glucose and plant residues were used as treatments in a factorial randomized block design with four replications The results were used to discuss the effects of Nitrogen, Glucose and organic C in these soils and the relationships between biomass C and total organic C. This suggests that changes in soil biomass C provide an early indication of changes in total soil organic C following changes in soil management. The dynamics of decomposition and transformation of different substrates (nitrogen, glucose and straw) and the effects of substrate incorporation on the turnover of soil biomass C and the decomposition of soil organic C was studied in 5 soils with different characteristics (e.g. clay content, biomass and organic C contents). From this the mechanisms of priming effects (i.e. accelerated decomposition of soil organic matter following incorporation of substrates) were established. It was also concluded that the measurement of biomass C by fumigation–incubation requires the use of a "control" (unfumigated soil) to estimate the basal respiration (the mineralization of non-biomass organic C) of the fumigated soil during 20, 40 and 60 days of incubations. Soil containing more organic C and receiving larger fresh organic C inputs also have faster rates of soil organic C mineralization, suggesting that the turnover of organic C in such soils is probably faster than in soils containing less organic C and receiving less fresh organic inputs.
机译：土壤的微生物生物质进行了研究作为新鲜有机输入变换到土壤中的试剂和天然土壤有机质本身。微生物生物量C和有机碳是在在伊朗Shahrood的区域的面积巴斯塔姆从5长期地栽培选择5个土壤测量。氮，葡萄糖和植物残渣被用作治疗在阶乘随机区组设计，重复4次的结果被用来讨论氮，葡萄糖和在这些土壤有机碳的作用和生物质C和总之间的关系有机C.这表明在土壤生物量变化c。提供在下面的土壤管理变化土壤总有机碳的变化的早期指示。分解和不同的底物（氮气，葡萄糖和秸秆）和底物掺入土壤的营业额量碳和土壤有机碳的分解作用转化的动力学在5个土壤具有不同特性（例如粘土含量，生物质进行了研究和有机碳含量）。从启动效应此的机制（即加速下列底物掺入土壤有机质分解）来建立。还得出结论，通过熏蒸孵育量C的测量需要使用“对照”（unfumigated土）的期间来估计熏蒸土壤的基础呼吸（非生物质的有机C的矿化）20，第40和60天孵化的。含有多种有机C和接收较大的新鲜有机碳投入也有土壤有机碳矿化更快的速率，这表明有机碳在这样的土壤的营业额可能比在含较少有机碳和接受较少新鲜有机输入土壤更快土壤。

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