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首页> 外文期刊>Soil Biology & Biochemistry >Oxygen exchange with water alters the oxygen isotopic signature of nitrate in soil ecosystems
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Oxygen exchange with water alters the oxygen isotopic signature of nitrate in soil ecosystems

机译：与水的氧交换改变了土壤生态系统中硝酸盐的氧同位素特征

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Combined oxygen (O) and nitrogen (N) stable isotope analyses are commonly used in the source determination of nitrate [inline image]. The source and fate of [inline image] are studied based on distinct O and N isotopic signatures (未[super]18O and 未[super]15N) of various sources and isotopic effects during [inline image] transformation processes, which differ between sources like fertilizer, atmospheric deposition, and microbial production (nitrification). Isotopic fractionation during production and consumption of [inline image] further affects the 未[super]18O and 未[super]15N signal. Regarding the 未[super]18O in particular, biochemical O exchange between O from [inline image] and H sub(2O is implicitly assumed not to affect the 未[super]18O signature of [inline image]. This study aimed to test this assumption in soil-based systems. In a short (24 h) incubation experiment, soils were treated with artificially [super]18O and [super]15N enriched [inline image]. Production of [inline image] from nitrification during the incubation would affect both the [super]18O and the [super]15N enrichment. Oxygen exchange could therefore be studied by examining the change in [super]18O relative to the [super]15N. In two out of the three soils, we found that the imposed [super]18O enrichment of the [inline image] declined relatively more than the imposed [inline image] enrichment. This implies that O exchange indeed affected the O isotopic signature of [inline image], which has important implications for [inline image] source determination studies. We suggest that O exchange between [inline image] and H) sub(2)O should be taken into consideration when interpreting the O isotopic signature to study the origin and fate of [inline image] in ecosystems.
机译：结合使用氧（O）和氮（N）的稳定同位素分析通常用于硝酸盐的来源测定[在线图像]。基于各种来源的不同的O和N同位素特征（未超18 O和未超15 N）以及在[内图像]转换过程中的同位素效应，研究了[内图像]的来源和命运，这些来源之间存在差异例如肥料，大气沉积和微生物生产（硝化）。 [inline image]的生产和消费过程中的同位素分馏进一步影响未超18O和未超15N信号。尤其是对于未超18O，隐式假设来自内嵌图像的O和H sub（2O）之间的生化O交换不影响内嵌图像的未上18O签名。在短时间（24 h）的温育实验中，对土壤进行了人工富集的[超] 18O和[超] 15N的[在线图像]，在孵化过程中硝化产生的[在线图像]将影响超级18 O和超级15 N都富集，因此可以通过研究超级18 O相对于超级15 N的变化来研究氧交换。在三种土壤中的两种中，我们发现内联图像的[super] 18O富集比所施加的内联图像的富集相对减少更多，这表明O交换确实影响了[内联图像]的O同位素标记，这对[内联图像]源具有重要意义。确定性研究。我们建议在解释O同位素特征以研究生态系统中[内嵌图像]的起源和命运时，应考虑[内嵌图像]和H）sub（2）O。

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