Feng Jianxiang, Zhou Jian, Wang Liming, Cui Xiaowei, Ning Cunxin, Wu Hao, Zhu Xiaoshan, Lin Guanghui
Division of Ocean Science and Technology, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China; School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, China.
Division of Ocean Science and Technology, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China; Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, 100084, China.
Chemosphere. 2017 Oct;184:774-783. doi: 10.1016/j.chemosphere.2017.06.060. Epub 2017 Jun 15.
The exotic cordgrass Spartina alterniflora has severely invaded the mangrove wetlands in southern China and ecological restoration using native mangroves was conducted in an attempt to control this invasive species. In this study, the contents and pools of soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) were quantified to investigate the invasive effects of S. alterniflora and then to evaluate whether the ecological restoration of native mangrove could reverse those effects. S. alterniflora only showed significantly higher organic carbon content in the surface 0-10 cm of soil than in the uninvaded mudflat. The high δC values in the surface soil of the invaded habitat demonstrated that S. alterniflora contributed 42.6-62.2% of the organic carbon. The SOC for invasive S. alterniflora and newly restored mangroves (4 years and 14 years) was not enhanced in comparison to the unvegetated mudflat. S. alterniflora significantly increased the surface soil TN content, but decreased the available phosphorus content and TP density. The TN densities increased gradually with the mangrove restoration, while the TP densities were only slightly influenced. The results suggested that short-term invasion of S. alterniflora and subsequent mangrove restoration did not alter SOC or TN pool sizes, but S. alterniflora was shown to affect the potential carbon storage capacity produced by the mangroves in the Zhangjiang Estuary.
外来物种互花米草已严重入侵中国南方的红树林湿地，为此开展了利用本地红树林进行生态修复的工作，以控制这种入侵物种。在本研究中，对土壤有机碳（SOC）、总氮（TN）和总磷（TP）的含量及储量进行了量化，以调查互花米草的入侵影响，进而评估本地红树林的生态修复能否扭转这些影响。互花米草仅在土壤表层0-10厘米处的有机碳含量显著高于未被入侵的泥滩。入侵栖息地表层土壤中的高δC值表明，互花米草贡献了42.6%-62.2%的有机碳。与无植被的泥滩相比，入侵互花米草区域以及新恢复的红树林（4年和14年）的SOC并未增加。互花米草显著增加了表层土壤TN含量，但降低了有效磷含量和TP密度。随着红树林的恢复，TN密度逐渐增加，而TP密度仅受到轻微影响。结果表明，互花米草的短期入侵及随后的红树林恢复并未改变SOC或TN储量，但互花米草被证明影响了漳江口红树林的潜在碳储存能力。
