不同干扰程度下黄河三角洲植被群落有机碳分布特征

为研究不同干扰程度下滨海湿地有机碳分布特征,选择黄河三角洲干扰程度较小的一千二管理站和黄河口管理站及干扰程度较大的东营港和五号桩4个研究区,对不同植被群落下的土壤有机碳含量、密度及单位面积储量进行研究。结果表明:植被生长初期(5月)一千二管理站、东营港、五号桩和黄河口管理站土壤有机碳含量、有机碳密度以及单位面积有机碳储量分别为3.504,3.433,3.698,3.815g/kg、4.84,4.58,5.02,5.56kg/m2和4 237.00,3 807.42,4 272.77,4 917.63t/km2。植被生长旺期(8月份)一千二管理站、东营港、五号桩和黄河口管理站土壤有机碳含量、有机碳密度以及单位面积有机碳储量分别为3.90,3.63,3.45,3.62g/kg、5.32,4.83,4.46,5.25kg/m2和4 588.02,4 010.10,3 614.95,4 623.12t/km2。人为活动干扰较大的五号桩和东营港地区,有机碳含量、有机碳密度以及单位面积有机碳储量较小;光滩有机碳含量比有植被生长的湿地低;互花米草湿地有机碳含量和有机碳密度在植被生长初期高于其他湿地类型,但这种优势在生长旺期不显著,与黄河口管理站和一千二管理站芦苇湿地单位面积有机碳储量相比较,互花米草湿地单位面积有机碳储量要低。由此可见,人为干扰对滨海湿地有机碳含量、密度及储量产生较大的影响,保护湿地完整性对于减少碳排放、维护滨海湿地的碳汇功能具有重要的作用。

Spatial and Temporal Distribution of Soil Organic Carbon in Vegetation Communities of the Yellow River Delta Under Different Disturbance Levels

In order to study the spatial and temporal distribution of soil organic carbon in wetland under different disturbance levels, we selected four study areas disturbed with different levels (Huanghekou station, Yiqianer station, Dongying port and Wuhaozhang) in the Yellow River Delta to investigate the organic carbon content, organic carbon density and organic carbon storage of different vegetation communities. The results showed that organic carbon content, organic carbon density and organic carbon storage in Yiqianer station, Dongying port, Wuhaozhuang and Huanghekou station were 3.504, 3.433, 3.698 and 3.815 g/kg, 4.84, 4.58, 5.02 and 5.56 kg/m2, and 4237.00, 3807.42, 4272.77 and 4917.63 t/km2, respectively, in May, while the parameters for the four study areas in August were 3.90, 3.63, 3.45 and 3.62 g/kg, 5.32, 4.83, 4.46 and 5.25 kg/m2, and 4588.02, 4010.10, 3614.95 and 4623.12 t/km2. The organic carbon content, organic carbon density and organic carbon storage per unit area were smaller in Dongying port and Wuhaozhuang with strong disturbance. The organic carbon contents of bare flats were lower than those of wetlands with vegetation. The organic carbon content and organic carbon density of Spartina alterniflora wetlands were higher than those of other wetlands in May, while in August the organic carbon storage per unit area of Phragmites australis wetland in Huanghekou station and Yiqianer station were higher than those of S. alterniflora wetlands. Human activities had great influence on organic carbon content, organic carbon density and organic carbon storage of costal wetland, and protecting integrity of wetland played an important role in reducing carbon emission and maintaining the carbon sink function of coastal wetlands.