Soil S availability in upland pastures of NE Scotland: relationship of extractable soil S and soil respiration to soil and site characteristics
Soil S availability in upland pastures of NE Scotland: relationship of extractable soil S and soil respiration to soil and site characteristics
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DOI：
10.1111/j.1475-2743.1999.tb00091.x
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发表时间：
1999-12-01
影响因子：
3.8
通讯作者：
Atkinson, D
中科院分区：
文献类型：
--
作者：
Donald, D;Chapman, SJ;Atkinson, D
1988/89年在苏格兰东北部牧场下采集的315个高地表土样品的平均可提取硫(S)浓度为13 μ g S(-1)（范围2-77 μ g S(-1)）超过三分之二的样品的S浓度低于生产性土壤的可接受浓度。对牧草S的分析还表明，三分之二的样品低于0.2% S A的呼吸指数：即纤维素分解过程中不添加S产生的二氧化碳占添加S产生的二氧化碳的百分比，在四分之一的土壤中明显低于100%。三种不同提取方法的结果表明，土壤中的硫酸盐主要以游离加吸附形式存在，而不是沉淀形式存在。土壤提取鉴定出显著的非硫酸盐S组分，可能是有机S。可提取S的变化源于地理、沉积和当地场地和土壤因素的综合。可提取S与土壤有机质含量呈显著正相关，与土壤pH呈负相关，这些因素共同解释了37%的变异，而地理区域、土壤关联和排水状况之间的平均浓度差异显著，但主要土壤亚群之间或海拔之间没有趋势。
The mean extractable sulphur (S) concentration in 315 upland topsoil samples collected in 1988/89 from beneath pasture in NE Scotland was 13 mu g S g(-1) (range 2-77 mu g S g(-1) More than two thirds of the samples had S concentrations less than that acceptable for productive soils. Continued decreases in atmospheric S inputs may have increased this proportion subsequently The analysis of herbage S also indicated that two-thirds of the samples were below 0.2% S. A 'respirometric index: namely CO2 produced during cellulose decomposition without added S as a percentage of that produced with added S, was significantly less than 100% in a quarter of the soils. Results of three different extraction procedures suggested that sulphate in the soils was present mainly as free plus adsorbed rather than precipitated forms. Soil extraction identified a significant non-sulphate S fraction, presumably organic S. The variability in extractable S stemmed from a combination of geographical, depositional and local site and soil factors. Extractable S was significantly correlated with soil organic matter content and inversely with soil pH and together these factors explained 37% of the variability While significant differences in mean concentrations between geographical area, soil association and drainage status were evident, no trends could be observed between the major soil subgroups or with altitude.