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首页> 外文OA文献 >Soil type and moisture regime control microbial C and N mineralization in grassland soils more than atmospheric CO2-induced changes in litter quality
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Soil type and moisture regime control microbial C and N mineralization in grassland soils more than atmospheric CO2-induced changes in litter quality

机译：土壤型和水分系统对草地土壤中的微生物C和N矿化多于大气的CO2诱导的垃圾质量变化

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Global change-induced alterations in litter quality and soil moisture regime will likely impact grassland C and N dynamics, but how these changes interact with edaphic properties across the landscape is unclear. We measured the effects of litter quality, soil type, soil moisture level, and soil drying-rewetting frequency (D-RW) on microbial C and N mineralization of litter and soil organic matter (SOM) in a full-factorial, controlled incubation experiment. Four levels of litter quality (no litter; or litter from Bouteloua curtipendula grown under 280, 380, 500 μL L‒1 CO2) were surface-applied to three contrasting soils common to Blackland Prairie landscapes: an upland Mollisol, a lowland Vertisol, and a fluvial Alfisol. Different soil moisture regimes were tested by incubating soils at four moisture levels (air-dry, 25%, 35%, or 50% water-holding capacity, WHC) and by drying-rewetting soils 0, 1, 2, 4 or 8 times over the 112- d incubation period. Litter additions stimulated microbial activity, increasing total CO2 production (i.e. C mineralized from litter + SOM decomposition) up to 17x more than no-litter controls (average 3x) and decreasing net N mineralization up to ‒3x less (average ‒0.5x) due to greater microbial N immobilization. Neither C nor N mineralization, however, was affected by litter quality. For all soils, litter decomposition increased with increasing WHC and D-RW frequency, but the average percent of total CO2 derived from litter was a negative function of SOM content. Similarly, net N mineralization also was positively correlated with soil WHC and affected most strongly by soil type (Alfisol u3c Mollisol u3c Vertisol). Net N mineralization responses to D-RW events was also soil-specific, with Alfisol soils showing no response and Mollisol and Vertisol soils decreasing after 4 D-RW events. Our results suggest that predicted changes in rainfall patterns and its interactions with soil type across the landscape will control short-term C and N mineralization responses in grasslands to a greater extent than atmospheric CO2- induced changes in litter C:N ratio for this common species of prairie grass.
机译：全球变化诱导的垃圾质量和土壤湿度制的改变可能会影响草原C和N动态，但这些变化如何与横跨景观的助辅助性相互作用。我们测量了凋落物质，土壤型，土壤水分水平和土壤干燥重塑频率（D-RW）对全因子，控制孵化实验的微生物C和N矿化的影响。四个水平的垫料质量（没有垃圾;从280,380,500μl1-1 CO2的Bouteloua饼纹纹饼干的垃圾）被表面应用于Blackland Prairie Landscapes的三个对比的土壤：高地莫里斯醇，低地Vertisol和氟血清醇。通过在四种水分水平（风干，25％，35％，35％，50％的水控能力，WHC）和通过干擦拭土壤0,1,2,4或8次的培养土壤来测试不同的土壤湿度制度在112-D潜伏期。凋落物添加刺激的微生物活性，增加总共二氧化碳生产（即从垃圾+ SOM分解的C矿化）多达17倍，超过无垃圾控制（平均3倍），并将净矿化降低至较小（平均-0.5倍）到期更大的微生物N固定。然而，COR N MOREIZATION都没有受到垃圾质量的影响。对于所有土壤，凋落物分解随着WHC和D-RW频率的增加而增加，但是衍生自垃圾的总CO 2的平均百分比是SOM含量的负函数。同样，净矿化也与土壤WHC呈正相关，并通过土壤型（Alfisol U3C Mollisol U3C Vertisol最强烈影响）。对D-RW事件的净矿化反应也是土壤特异性的，Alfisol土壤显示出在4 D-RW事件之后没有响应和莫拉多醇和活醇土壤减少。我们的研究结果表明，预测降雨模式的变化及其与土壤类型的相互作用将在草地上控制短期C和N矿化反应，比大气CO2诱导的垃圾C：N比对于这种常见物种的比例进行更大程度大草原草。

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