Phosphate stable oxygen isotope variability within a temperate agricultural soil.
Phosphate stable oxygen isotope variability within a temperate agricultural soil.
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DOI：
10.1016/j.geoderma.2016.09.020
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发表时间：
2017-01-01
期刊：
影响因子：
6.1
通讯作者：
McGrath S
中科院分区：
文献类型：
--
作者：
Granger SJ;Harris P;Peukert S;Guo R;Tamburini F;Blackwell MS;Howden NJ;McGrath S
在这项研究中，我们进行了空间分析土壤总磷(TP)，酸提取磷(PO_4)和稳定氧(O)同位素比值(δ18OPO_4)从集约化管理的农业草地场地。土壤全磷含量为736~1952mgP/kg−~(-1)，其中12%~48%是用1M HCl(HClPO_4)溶液提取的，两者呈显著正相关。提取的PO4的δ为1 8.0~2 1.6‰，平均为18.8‰(±0.8)。虽然已经在不同尺度上研究了全磷的空间变异性，但这是第一次在田间尺度上评估土壤δ18OPO4的变异性。我们调查了δ18OPO_4的变异性是否与：(I)其本身与空间自相关效应有关；以及(Ii)HClPO_4、海拔和坡度--无论是全球还是局部的。结果表明，δ~(18)OPO_4在空间上不具有自相关性，δ~(18)OPO_4与高程、坡度的相关性较弱。有趣的是，后一种关系似乎在当地的强度有所不同。特别是，δ18OPO_4与HClPO_4的关系可能取决于下层土壤类别和/或在研究田地历史上由北向南划分的不同田地管理措施，该划分在本研究之前四年已被取消。我们研究了7.1hm2土地上土壤P及其δ18OPO4的变异性。酸抽提物δ18OPO_4的变化范围为17.0~21.6‰。δ18OPO4在空间上不是自相关的，是随机分布的。δ18OPO_4的变异与HClPO_4呈异质性相关。这种关系可能取决于研究领域的历史管理。
In this study, we conduct a spatial analysis of soil total phosphorus (TP), acid extractable phosphate (PO4) and the stable oxygen (O) isotope ratio within the PO4 molecule (δ18OPO4) from an intensively managed agricultural grassland site. Total P in the soil was found to range from 736 to 1952 mg P kg− 1, of which between 12 and 48% was extractable using a 1 M HCl (HClPO4) solution with the two variables exhibiting a strong positive correlation. The δ18OPO4 of the extracted PO4 ranged from 17.0 to 21.6‰ with a mean of 18.8‰ (± 0.8). While the spatial variability of Total P has been researched at various scales, this is the first study to assess the variability of soil δ18OPO4 at a field-scale resolution. We investigate whether or not δ18OPO4 variability has any significant relationship with: (i) itself with respect to spatial autocorrelation effects; and (ii) HClPO4, elevation and slope - both globally and locally. Results indicate that δ18OPO4 was not spatially autocorrelated; and that δ18OPO4 was only weakly related to HClPO4, elevation and slope, when considering the study field as a whole. Interestingly, the latter relationships appear to vary in strength locally. In particular, the δ18OPO4 to HClPO4 relationship may depend on the underlying soil class and/or on different field managements that had operated across an historical north-south field division of the study field, a division that had been removed four years prior to this study. We examine the variability of soil P and its δ18OPO4 within a 7.1 ha field. The acid extractable δ18OPO4 was found to range between 17.0 and 21.6‰. The δ18OPO4 was not spatially autocorrelated and was randomly distributed. Variation in δ18OPO4 appears heterogenically related to HClPO4. This relationship may depend on historical management of the study field.
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影响因子：
1.7
作者：
Gelfand, Alan E.;Sahu, Sujit K.;Holland, David M.
通讯作者：
Holland, David M.
影响因子：
6.5
作者：
Blackwell, Martin S. A.;Carswell, Alison M.;Bol, Roland
通讯作者：
Bol, Roland
影响因子：
6.1
作者：
Glendell, Miriam;Granger, Steve J.;Brazier, Richard E.
通讯作者：
Brazier, Richard E.
DOI：
10.1111/1467-9884.00145
发表时间：
1998-01-01
期刊：
JOURNAL OF THE ROYAL STATISTICAL SOCIETY SERIES D-THE STATISTICIAN
影响因子：
--
作者：
Brunsdon, C;Fotheringham, S;Charlton, M
通讯作者：
Charlton, M
影响因子：
3
作者：
Brunsdon, C;Fotheringham, AS;Charlton, M
通讯作者：
Charlton, M