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Effects of simulated rainfall events on soil carbon transformation

机译：模拟降雨事件对土壤碳转化的影响

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The storage of carbon (C) in soils can be influenced by rainfall patterns that affect both inputs from plant productivity and losses through soil respiration. The aim of this study was to investigate the effect of rainfall on the soil C transformation. A laboratory experiment was conducted using soil columns with different treatments, including a control with constant water content, and rainfall treatments with applications of 3, 6, and 10 simulated rainfall events during an experimental period of 31 days. Results showed that pulses of soil respiration rates occurred after the first 3 rainfall events, associated with soil water content and CO2 concentration pulses in the soil profile, while subsequent rainfall events did not result in similar increases in CO2 concentrations and respiration rates. Relative to the control treatment, the treatments with low (3 rainfall events) and moderate (6 rainfall events) amounts of total water applied resulted in 181% and 72% increases, respectively, in cumulative CO2 emission. In contrast, the high frequency rainfall treatment with the greatest amount of water resulted in a 40% reduction in cumulative CO2 emission. Soil microbial biomass C slightly increased under treatments with low and moderate rainfall treatments, but decreased under the treatment with 10 rainfall events. The results indicate that rainfall events with a high frequency and increased amount of water, and associated saturation of soils, can significantly reduce soil C losses during the wet season. The rainfall frequency and amount are of importance in controlling soil C emissions and should be incorporated into models of soil C dynamics.
机译：碳在土壤中的储存可能受到降雨模式的影响，降雨模式既影响植物生产力的输入，也影响土壤呼吸的损失。这项研究的目的是调查降雨对土壤碳转化的影响。使用不同处理的土壤柱（包括恒定含水量的对照）和在31天的实验期内应用3次，6次和10次模拟降雨事件进行降雨处理的实验室实验。结果表明，土壤呼吸速率的脉冲发生在前三个降雨事件之后，与土壤剖面中的土壤水分和二氧化碳浓度脉冲有关，而随后的降雨事件并未导致二氧化碳浓度和呼吸速率的类似增加。相对于对照处理，总施水量少（3次降雨事件）和中度（6次降雨事件）的处理分别导致累积CO2排放增加181％和72％。相反，用最大量的水进行高频降雨处理可使累积的CO2排放降低40％。在中低降雨条件下土壤微生物量C略有增加，但在10次降雨事件下土壤微生物量C有所下降。结果表明，高频率，高含水量的降雨事件以及相关的土壤饱和度可以显着减少湿季的土壤碳损失。降雨频率和雨量在控制土壤碳排放中很重要，应纳入土壤碳动力学模型中。

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