Sci Total Environ:中科院华南植物园闫俊华研究组揭示南亚热带森林

摘要 : 近日，国际学术期刊《Science of the Total Environment》在线发表中国科学院华南植物园生态系统生态学闫俊华研究组在南亚热带森林土壤缓冲酸雨能力研究进展文章。

近日，国际学术期刊《science of the Total Environment》在线发表中国科学院华南植物园生态系统生态学闫俊华研究组在南亚热带森林土壤缓冲酸雨能力研究进展文章。博士研究生江军为论文第一作者，闫俊华研究员为论文通讯作者。

自上个世纪80年代以来，西欧、北美温带地区的酸沉降频率已大大降低，但我国亚热带地区的酸沉降(人为增加的SO2和NOX排放)问题依然严峻。酸沉降的增加能够改变森林土壤养分平衡以及化学物质的淋溶动态，从而影响整个森林生态系统的功能。因此，具有较高酸缓冲能力的森林土壤将有利于整个森林生态系统的稳定。

研究人员以南亚热带鼎湖山自然保护区三种不同的地带性森林(马尾松林、针阔叶混交林以及常绿阔叶林)土壤为研究对象，利用原状土柱模拟酸沉降实验，探究不同森林土壤的酸缓冲能力及相关机制。研究结果表明，高浓度酸处理显著降低了马尾松林与混交林土壤pH与ANC，显著增加了土壤盐基离子、酸性阴离子、DOC以及毒理性Al3+的释放。相比之下，低酸与高酸处理均对阔叶林土壤pH、ANC、DOC以及离子输出无显著影响。因此，阔叶林土壤具有较高的酸缓冲能力，保护成熟的阔叶林将在应对高强度的酸沉降方面发挥重要作用，从而保护溪流水质安全。


原文链接：

Responses of soil buffering capacity to acid treatment in three typical subtropical forests

原文摘要：

Elevated anthropogenic acid deposition can significantly affect forest ecosystem functioning by changing soil pH, nutrient balance, and chemical leaching and so on. These effects GENErally differ among different forests, and the dominant mechanisms for those observed responses often vary, depending on climate, soil conditions and vegetation types. Using soil monoliths (0–40 cm) from pine forest (pioneer), coniferous and broadleaved mixed forest (transitional) and broadleaved forest (mature) in southern China, we conducted a leaching experiment with acid treatments at different pH levels (control: pH ≈ 4.5; pH = 3.5; pH = 2.5). We found that pH 3.5 treatment significantly reduced dissolved organic carbon (DOC) concentrations in leachate from the pioneer forest soil. pH 2.5 treatment significantly increased concentrations of NO3−, SO42 −, Ca2 +, Mg2 +, Al3 +, Fe3 + and DOC in leachate from the pioneer forest soil, and also concentrations of NO3−, SO42 −, Mg2 +, Al3 +, Fe3 + and DOC in leachate from the transitional forest soil. All acid treatments had no significant effects on concentrations of these chemicals in leachate from the mature forest soil. The responses can be explained by the changes in soil pH, acid neutralizing capacity (ANC) and concentrations of Al and Fe. Our results showed that acid buffering capacity of the pioneer or transitional forest soil was lower than that of the mature forest soil. Therefore preserving mature forests in southern China is important for reducing the adverse impacts of high acid deposition on stream water quality at present and into the future.

doi:10.1016/j.scitotenv.2016.04.198

作者：闫俊华

;