Determination of Agricultural Impact on Soil Microbial Activity Using δ18OPHCl and Respiration Experiments,ACS Earth and Space Chemistry

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Determination of Agricultural Impact on Soil Microbial Activity Using δ18OPHCl and Respiration Experiments
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2018-05-04 00:00:00 , DOI: 10.1021/acsearthspacechem.8b00021
Katherine Polain , Christopher Guppy , Oliver Knox , Leanne Lisle , Brian Wilson ₁ , Yui Osanai , Nina Siebers ₂

Affiliation

Improved understanding of microbial activity and associated nutrient cycling in agricultural systems is required to maximize production while maintaining and improving soil fertility. We compared past and current microbial activity using the stable δ¹⁸O_P HCl pool and respiration incubations under crop and native systems to a depth of 1 m. Contrary to current understanding, agricultural practices have not decreased microbial activity in our crop system. Differences in average δ¹⁸O_P HCl signatures between land use systems, indicated higher past microbial activity in the entire soil profile under the crop system (13.7‰) compared to the native system soil profile (11.0‰), while current microbial activity was double under the crop system, especially between 15 and 100 cm. Evenly distributed microbial activity in the top and subsoils of the crop system, as well as an increase of biomass in the native system subsoil, highlight the importance of investigating microbial dynamics beyond the top 0–30 cm of the soil profile. In these relatively dry, carbon and nutrient poor Australian soils, the influence of water is perhaps the key to explaining our results.

中文翻译：

使用δ对土壤微生物活性农业影响的测定^18个ö _P_的HCl和呼吸实验

在保持和改善土壤肥力的同时，需要对农业系统中微生物活性和相关养分循环有更好的了解，以使产量最大化。我们使用稳定δ相比过去和目前的微生物活性^18个ö _P的HCl下作物和本地系统池和呼吸孵育至1μm的深度。与当前的理解相反，农业实践并未降低我们作物系统中的微生物活性。在平均差异δ ¹⁸ ö _P盐酸土地利用系统之间的特征表明，作物系统下整个土壤剖面中过去的微生物活动（13.7‰）要高于原生系统土壤剖面（11.0‰），而作物系统中当前的微生物活动则翻了一番，尤其是在15年之间和100厘米。作物系统表层和下层土壤中微生物活动的均匀分布，以及原生系统下层土壤中生物量的增加，凸显了调查土壤剖面最上层0–30 cm以外微生物动态的重要性。在这些相对干燥，碳和养分贫乏的澳大利亚土壤中，水的影响也许是解释我们结果的关键。

更新日期：2018-05-04

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