Spatial variations in the surface water chemistry of subtropical peatlands (central china) linked to anthropogenic pressures
Spatial variations in the surface water chemistry of subtropical peatlands (central china) linked to anthropogenic pressures
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与人为压力相关的亚热带泥炭地（中国中部）地表水化学的空间变化
DOI：
10.3390/w9070505
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发表时间：
2017
期刊：
影响因子：
3.4
通讯作者：
Zeng Linghan
中科院分区：
文献类型：
--
作者：
Cao Yanmin;Chen Xu;Bu Zhaojun;Zeng Linghan
与广泛调查的温带和北方泥炭地相比，亚热带泥炭地受到的科学关注相当少。本研究对采自三个亚热带泥炭地(中国中部)的57个水样进行了水化学空间变异研究。总体而言，这些样品的水体pH和主要阳离子浓度沿沼泽富沼泽梯度接近于贫瘠沼泽的特征。通过聚类分析和主成分分析，确定了4个不同的类群。第一组中的痕量元素浓度较高，可能与附近一条在建道路上的空气扬尘污染物有关。组II的低pH值和低主要阳离子浓度可能与泥炭藻阳离子交换容量大有关。与之相反的是，主要采集自泥炭藓收获地的第三类样品显示出较高的pH水平和主要阳离子浓度。第IV类中的微量元素浓度相对较低(除硼外)，可作为这些泥炭地恢复工作的参考条件。综上所述，三个泥炭地水化学的空间差异与自然过程(例如，泥炭藓的阳离子交换)和人为压力(例如，泥炭藓的收获)密切相关。总体而言，这六种微量元素的平均健康风险值较低，表明这些泥炭地的水质良好。这项研究为这些亚热带泥炭地以及其他类似生态系统的可持续管理提供了基线水化学信息。
Compared with the extensively surveyed temperate and boreal peatlands, subtropical peatlands have received rather little scientific attention. In this study, spatial variations in water chemistry were investigated in 57 samples collected from three subtropical peatlands (central China). Generally, water pH and major cation concentrations of these samples approached the characteristics of poor fens along the bog–rich fen gradient. Four distinct groups were identified by cluster analysis and principal component analysis. High concentrations of trace elements in Group I were probably linked to airborne dust pollutants from a nearby road under construction. Low pH values and low major cation concentrations in Group II may be attributed to the great cation exchange capacity of Sphagnum. In contrast, samples in Group III, mainly collected from sites suffering from Sphagnum harvest, showed high pH levels and major cation concentrations. Relatively low concentrations of trace elements (except boron) in Group IV can be regarded as reference conditions for restoration efforts in these peatlands. Taken together, spatial variations in the water chemistry of the three peatlands were closely linked to natural processes (e.g., cation exchange of Sphagnum) and anthropogenic pressures (e.g., Sphagnum harvest). Overall, the mean health risk values of the six trace elements were low, indicating good water quality in these peatlands. This study provided baseline water chemistry information for the sustainable management of these subtropical peatlands, as well as other similar ecosystems.