Impact of fertilizer on a small watershed of Lake Biwa: Use of sulfur and strontium isotopes in environmental diagnosis
Impact of fertilizer on a small watershed of Lake Biwa: Use of sulfur and strontium isotopes in environmental diagnosis
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DOI：
10.1016/j.scitotenv.2007.05.033
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发表时间：
2007-10-01
影响因子：
9.8
通讯作者：
Yachi, Shigeo
中科院分区：
文献类型：
--
作者：
Hosono, Takahiro;Nakano, Takanori;Yachi, Shigeo
在三个不同种植期（四月、五月和六月）收集的39个河水样本中以及用于比较的几种材料（肥料、洗涤剂、土壤、灌溉和农业用水）中测定了硫和锶同位素（δ S-34和Sr-87/Sr-86），以评估肥料对日本中部琵琶湖小型农业流域的影响。沃茨。从流域上游到下游，随着SO 4浓度的增加（3.8到93.2 ppm），河水中的δ S-34值降低（从+5.8到-2.0 ppm）。河水硫同位素与可能来源物质的对比表明，SO 4的富集是由于两种肥料的溶解作用：（1）当地常用的复合肥料;（2）小规模施用的硫酸铵。河水Sr-87/Sr-86值从4月开始随时间逐渐下降（平均值为1.25），而河水Sr-87/Sr-86值从4月开始逐渐下降（平均值为1.25）。0.71163），至5月（平均值。0.71139），至6月（平均。0.71127）。Sr-87/Sr-86与I/Sr图上样地的趋势表明，土壤水分对河流的贡献随时间而增加，这部分是受含锶肥料的影响。据认为，最大的25%的溶解锶来自这些肥料，而超过75%的它是岩石来源。质量平衡计算使我们能够评估肥料在每条河流中的贡献比例。联合使用的S和Sr同位素与浓度数据可能是一种新的环境诊断技术，在局部流域的河流和土壤。(C)2007 Elsevier B. V.保留所有权利。
Sulfur and strontium isotopes (delta S-34 and Sr-87/Sr-86) were determined in 39 river water samples collected over three different cultivation periods (April, May, and June), and in several materials used for comparison (fertilizers, detergents, soils, irrigation and agricultural waters), to evaluate the impact of fertilizers on a small agricultural watershed of Lake Biwa, in central Japan. delta S-34 values in river water decreased (from +5.8 to -2.0 parts per thousand) with increasing SO4 concentrations (3.8 to 93.2 ppm) from upstream to downstream of the watershed. Comparison of river water S isotopes with those of possible source materials indicates that the enrichment of SO4 can be attributed to the dissolution of two kinds of fertilizers: (1) compound fertilizers commonly used in this area and (2) ammonium sulfate which is applied on a small scale. In contrast, Sr-87/Sr-86 values of river water decreased with time from April (avg. 0.71163), through May (avg. 0.71139), to June (avg. 0.71127). The tendency of the sample plots on the Sr-87/Sr-86 vs. I/Sr diagram suggests a time-dependent increase in the contribution of soil water to the river, which is partly affected by the Sr-bearing fertilizers. It is suggested that a maximum of 25% of dissolved Sr is derived from these fertilizers, while more than 75% of it is of rock origin. Mass balance calculations permitted us to evaluate the proportion of fertilizer contribution in each river. Combined use of S and Sr isotopes together with concentration data could be a new environmental diagnosis technique for rivers and soils in localized watersheds. (C) 2007 Elsevier B.V. All rights reserved.