Stable isotope studies of moss sulfur and sulfate from bog surface waters
Stable isotope studies of moss sulfur and sulfate from bog surface waters
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DOI：
10.2343/geochemj.42.481
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发表时间：
2008-12
影响因子：
0.8
通讯作者：
G. Skrzypek;T. Akagi;Wojciech Drzewicki;M. Jędrysek
中科院分区：
文献类型：
--
作者：
G. Skrzypek;T. Akagi;Wojciech Drzewicki;M. Jędrysek
两个藓属（泥炭藓属和多毛藓属）季节性收集在两个接近（约0.45公里的距离），但环境不同的位置，一个开放的沼泽和云杉林在哈拉Izerska（Izerskie山/ SW波兰），用于植物体内硫的稳定同位素分析。同时，在苔藓生长的地方和沿着排放沼泽的小溪收集地表水，进行硫酸盐硫的稳定同位素分析（生长季节5个地点/5次）。泥炭藓类δ 34 S值为3.99 ~ 10.24‰，金发藓类δ 34 S值为4.18 ~ 6.48‰。溪流沃茨中硫酸盐的δ 34 S值随位置和季节的不同而变化，范围为3.72 ~ 20.26‰。泥炭藓类植物体内硫含量与其同位素组成呈显著正相关，地表水硫酸盐δ 34 S与苔藓体内硫含量呈松散相关。根据Rayleigh蒸馏模型计算出的硫酸盐分馏系数约为4‰，可能是泥炭藓同化硫酸盐和细菌还原硫酸盐两个过程造成的。δ 34 S（SO 42-）和δ 13 C（DIC）值的高度相关性和同时增加表明，较轻的碳和硫同位素（12 C和32 S）被优先去除，可能是由于植物的同化作用。目前的结果表明，在环境中的硫源的原始签名大大改变了生物活动在沼泽水。
Two moss genera (Sphagnum and Polytrichum) were collected seasonally in two close (∼0.45 km distance) but environmentally different locations, an Open bog and a Spruce forest at Hala Izerska (the Izerskie Mts./SW Poland), for the stable isotope analyses of plant in-body sulfur. Simultaneously, surface water was collected in places of moss growth and along the creek discharging the bog, for stable isotope analysis of sulfate sulfur (5 locations/5 times in growing seasons). The δ34S value of the analyzed mosses varies from 3.99 to 10.24‰ for Sphagnum and from 4.18 to 6.48‰ for Polytrichum. The δ34S value of aqueous sulfate in creek waters, depending on location and season, ranges from 3.72 to 20.26‰. The significant correlation between the plant in-body sulfur concentration and the isotopic composition was observed for Sphagnum as well as loose correlation between δ34S of sulfates in surface water and moss in-body sulfur. The fractionation factor, possibly caused by two processes of sulfate assimilation by Sphagnum and sulfate reduction by bacteria, calculated based on Rayleigh's distillation model equals about 4‰. The high correlation and simultaneous increase of δ34S(SO42-) and δ13C(DIC) values downstream the creek discharging the bog suggest that the lighter isotopes of carbon and sulfur (12C and 32S) are preferentially removed, probably due to assimilation by plants. The present results imply the original signature of the source of sulfur in the environment is greatly altered by the biological activities in bog water.