Plant invasion alters the fundamental structure and function of native ecosystems by affecting the biogeochemical pools and fluxes of materials and energy. Native(Suaeda salsa) and invasive(Spartina alterniflora) salt...Plant invasion alters the fundamental structure and function of native ecosystems by affecting the biogeochemical pools and fluxes of materials and energy. Native(Suaeda salsa) and invasive(Spartina alterniflora) salt marshes were selected to study the effects of Spartina alterniflora invasion on soil organic carbon(SOC) contents and stocks in the Yellow River Delta. Results showed that the SOC contents(g/kg) and stocks(kg/m^2) were significantly increased(P < 0.05) after Spartina alterniflora invasion of seven years, especially for the surface soil layer(0–20 cm). The SOC contents exhibited an even distribution along the soil profiles in native salt marshes, while the SOC contents were gradually decreased with depth after Spartina alterniflora invasion of seven years. The natural ln response ratios(Ln RR) were applied to identify the effects of short-term Spartina alterniflora invasion on the SOC stocks. We also found that Spartina alterniflora invasion might cause soil organic carbon losses in a short-term phase(2–4 years in this study) due to the negative Ln RR values, especially for 20–60 cm depth. And the SOCD in surface layer(0–20 cm) do not increase linearly with the invasive age. Spearman correlation analysis revealed that silt + clay content was exponentially related with SOC in surface layer(Adjusted R^2 = 0.43, P < 0.001), suggesting that soil texture could play a key role in SOC sequestration of coastal salt marshes.展开更多
互花米草是我国从美国引进的外来物种，目前在我国沿海已形成大面积的互花米草盐沼，对潮滩土壤等环境产生重大影响。为了分析互花米草盐沼土壤有机质的分布特征，本文通过对江苏东台沿海不同地点（生长年数）的互花米草盐沼土壤样品的...互花米草是我国从美国引进的外来物种，目前在我国沿海已形成大面积的互花米草盐沼，对潮滩土壤等环境产生重大影响。为了分析互花米草盐沼土壤有机质的分布特征，本文通过对江苏东台沿海不同地点（生长年数）的互花米草盐沼土壤样品的有机质含量分析，发现互花米草盐沼在由海堤向外的水平方向上变化的平均梯度为每100 m 土壤有机质含量减少 0.87 g/kg，垂直方向上的平均梯度为每向下 1 cm 土壤有机质含量减少 0.05 g/kg。互花米草盐沼土壤有机质的含量与互花米草生长年数相关程度较高，而与植株的生长状况相关较低。展开更多
基金Under the auspices of the National Key R&D Program of China(No.2017YFC0505906)the National Natural Science Foundation of China(No.51639001,51379012)the Interdiscipline Research Funds of Beijing Normal University
文摘Plant invasion alters the fundamental structure and function of native ecosystems by affecting the biogeochemical pools and fluxes of materials and energy. Native(Suaeda salsa) and invasive(Spartina alterniflora) salt marshes were selected to study the effects of Spartina alterniflora invasion on soil organic carbon(SOC) contents and stocks in the Yellow River Delta. Results showed that the SOC contents(g/kg) and stocks(kg/m^2) were significantly increased(P < 0.05) after Spartina alterniflora invasion of seven years, especially for the surface soil layer(0–20 cm). The SOC contents exhibited an even distribution along the soil profiles in native salt marshes, while the SOC contents were gradually decreased with depth after Spartina alterniflora invasion of seven years. The natural ln response ratios(Ln RR) were applied to identify the effects of short-term Spartina alterniflora invasion on the SOC stocks. We also found that Spartina alterniflora invasion might cause soil organic carbon losses in a short-term phase(2–4 years in this study) due to the negative Ln RR values, especially for 20–60 cm depth. And the SOCD in surface layer(0–20 cm) do not increase linearly with the invasive age. Spearman correlation analysis revealed that silt + clay content was exponentially related with SOC in surface layer(Adjusted R^2 = 0.43, P < 0.001), suggesting that soil texture could play a key role in SOC sequestration of coastal salt marshes.
文摘互花米草是我国从美国引进的外来物种，目前在我国沿海已形成大面积的互花米草盐沼，对潮滩土壤等环境产生重大影响。为了分析互花米草盐沼土壤有机质的分布特征，本文通过对江苏东台沿海不同地点（生长年数）的互花米草盐沼土壤样品的有机质含量分析，发现互花米草盐沼在由海堤向外的水平方向上变化的平均梯度为每100 m 土壤有机质含量减少 0.87 g/kg，垂直方向上的平均梯度为每向下 1 cm 土壤有机质含量减少 0.05 g/kg。互花米草盐沼土壤有机质的含量与互花米草生长年数相关程度较高，而与植株的生长状况相关较低。
