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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Photooxidation of pyrogenic organic matter reduces its reactive, labile C pool and the apparent soil oxidative microbial enzyme response
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Photooxidation of pyrogenic organic matter reduces its reactive, labile C pool and the apparent soil oxidative microbial enzyme response

机译：热原有机物的光氧化降低了其活性，不稳定的C池和表观土壤氧化微生物酶反应

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The surface chemistry of pyrogenic organic matter (PyOM) is altered by a variety of abiotic and biotic oxidative and sorption/desorption processes in the environment. Exposure of PyOM to high energy light prior to addition to soil or sediment, or while entrained in the atmosphere, may induce significant surface photooxidation, i.e., photochemical weathering, altering its environmental reactivity. We report on a 30-day soil incubation experiment testing the effects of the photochemical weathering of a C-13-enriched ponderosa pine PyOM, produced by pyrolysis at 450 degrees C, on PyOM and soil organic carbon (SOC) mineralization. PyOM C mineralization was measured for both the photochemically weathered (i.e. UV treated PyOM or PyOMUV) and PyOM not exposed to high-energy light (i.e. PyOMW serving as a dark control). PyOMW exhibited a 3.7 times faster C mineralization rate across the 30-d study, which was driven by a large early mineralization of accessible/labile C during the first 6 d. In contrast, PyOMUV had faster C mineralization rates in the later part of the experiment (days 11-30). Overall, PyOMUV had a 13% lower net C mineralization than the untreated PyOMW where the MRT of accessible PyOMUV-C and PyOMW-C was calculated at 25.7 +/- 6.8 d and 1.7 +/- 02 d, respectively. Both forms of PyOM promoted a similar net reduction in native SOC mineralization (i.e., negative priming) of approximately 50% relative to the unamended, control soil. Addition of either PyOM form resulted in an equivalent minor decrease in the concentration of extractable soil lignin phenols and substituted fatty acids chemistry with respect to the unamended soil. At 30 d, soil phenol oxidase and peroxidase enzyme activities were higher with additions of either form of PyOM compared with the unamended control soils with PyOMUV exhibiting lower activities than PyOMW. Our results indicate that PyOM photochemical weathering can impart important changes to short-term PyOM reactivity and soil microbial activity, which could have important implications for soil systems by ultimately lowering turnover rates for both NSC and PyOM-C. (C) 2017 Elsevier B.V. All rights reserved.
机译：通过环境中的各种非生物和生物氧化和吸附/解吸过程改变了热源有机物质（Pyom）的表面化学。 Pyom在添加到土壤或沉积物之前将Pyom暴露于高能量光，或者在大气中夹带的同时，可以诱导显着的表面光氧化，即光化学风化，改变其环境反应性。我们报道了30天的土壤孵化实验测试了通过在450℃的溶解的C-13富型孔皮松yOM的光化学风化的效果测试，在450摄氏度下，对Pyom和土壤有机碳（SoC）矿化产生了一种。测量Pyom C矿化，用于光化学风化（即UV处理的Pyomu或Pyomuv）和PyoM，没有暴露于高能光（即用作暗控制的Pyomw）。 Pyomw在30-D研究中展现了3.7倍的C矿化率，这是在前6天期间可访问/不稳定C的大型早期矿化驱动的。相比之下，PyomuV在实验的后部部分（第11-30天）的后部具有更快的C矿化率。总体而言，PyomuV的净矿化率低于未处理的Pyomw，分别在25.7 +/- 6.8d和1.7 +/- 02d中计算出可获得的pyomuv-c和pyomw-c的MRT。两种形式的Pyom促进了与未衰老的对照土壤的天然Soc矿化（即，负灌注）的净减少约50％。添加剂形式的添加剂形成的浓度的浓度的浓度较小，并取代脂肪酸化学相对于未来的土壤。在30d中，除了具有比pyomw的较低活动较低的活性的粘液相比，土壤酚醛氧化酶和过氧化物酶活性较高。我们的结果表明，Pyom光化学风化可以赋予短期麦克斯反应性和土壤微生物活性的重要变化，这对于土壤系统来说，通过最终降低NSC和Pyom-C的周转率来对土壤系统具有重要意义。 （c）2017 Elsevier B.v.保留所有权利。

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