广西仙岛公园和沙井红树林土壤碳氮储量的空间分布

Spatial Distribution of Soil Carbon and Nitrogen Stocks in Mangrove Wetland of Xiandao Park and Shajing in Guangxi

中文关键词: 仙岛公园  沙井  红树林  碳氮储量  空间分布

英文关键词: Xiandao Park  Shajing  Mangrove  Storage of SOC and TN  Spatial distribution

中文摘要:

      通过对广西茅尾海的仙岛公园和沙井红树林土壤有机碳(SOC)、全氮(TN)含量和空间分布特征，以及碳氮比(C/N)与SOC和TN的相关性研究，结果显示，仙岛公园红树林的SOC和TN的平均含量分别为24.5和1.06 g/kg，沙井红树林的SOC和TN平均含量分别为11.9和0.71 g/kg。仙岛公园和沙井红树林的SOC储量分别为181.03和92.4 t/hm2，存在显著性差异(P<0.05)，仙岛公园和沙井红树林的TN储量分别为8.23和5.12 t/hm2，SOC和TN储量垂直分布，随土层深度的增加呈先减少后增加的趋势(沙井TN除外)。沙井红树林的SOC与TN储量之间相关性极显著(P<0.01，R=0.947)，仙岛公园红树林的SOC与TN储量之间相关系数为0.407。这2个研究地点的C/N值为16.77~24.39，其有机质主要来源于陆地，仙岛公园红树林的C/N值与SOC储量存在显著的相关性(P<0.01)，沙井红树林的C/N值与TN储量呈显著负相关(P<0.05)。仙岛公园红树林的SOC储量高于我国森林土壤平均碳储量，显示了红树林土壤较高的固碳能力。

英文摘要:

      The contents and storage patterns of soil organic carbon (SOC) and total nitrogen (TN), spatial distribution characteristics of SOC and TN, C/N ratios, and correlation between SOC and TN in Xiandao Park and Shajing (Guangxi) mangrove wetlands were assessed. The average SOC and TN contents of the Xiandao Park mangrove wetlands were 24.5 and 1.06 g/kg, respectively, and those of the Shajing mangrove wetlands were 11.9 and 0.71 g/kg, respectively. SOC storage capacities of the Xiandao Park and Shajing mangrove wetlands were 181.03 and 92.4 t/hm2, respectively, and were significantly different (P<0.05). TN storage capacities of Xiandao Park and Shajing mangrove wetlands were 8.23 and 5.12 t/hm2, respectively. The highest-to-lowest vertical distribution of SOC storage at both sites and TN storage at Xiandao Park was 20~40 cm > 40~60 cm > 0~20 cm, while TN storage at Shajing decreased with increasing soil depth. A significant correlation was observed between SOC and TN contents at Shajing (P<0.01); the correlation coefficient was 0.947. C/N ratio at both sites ranged from 16.77 to 24.39, indicating that the organic matter came primarily from the land. A significant correlation between soil C/N and SOC storage was evident at Xiandao Park (P<0.01), and a significant negative correlation between C/N and TN storage was evident at Shajing (P<0.05). The SOC storage of the Xiandao Park mangrove wetlands was higher than that of Chinese forests, indicating that mangrove soil has a higher carbon sequestration capacity.