亚热带森林公园土壤微生物量碳分布的影响因素研究

Distribution and Influencing Factors of Soil Microbiomass Carbon in Subtropical Forest Parks

摘要: 研究以武汉市八分山、青龙山、马鞍山、磨山和九峰山森林公园为对象，研究土壤微生物量碳的分布特征及其土壤环境影响因子。在每座山选择8种主要树种，共设置120个采样点，于2021年9月至11月进行土壤样品采集，采用抖落法采集根际土壤样品。结果显示：(1) 八分山(57.42~502.22 mg∙kg−1)、青龙山(148.59~563.78 mg∙kg−1)、马鞍山(270.76~908.44 mg∙kg−1)和磨山(137.45 ~ 654.81 mg∙kg−1)不同植物群落土壤微生物量碳间差异显著，九峰山(224.18~595.56 mg∙kg−1)不同植物土壤微生物量碳间无显著差异。(2) 青龙山土壤微生物量碳与铵态氮(r = 0.462, p < 0.05)呈显著正相关；马鞍山土壤微生物量碳与有机碳(r = 0.648, p < 0.01)、硝态氮(r = 0.434, p < 0.05)、铵态氮(r = 0.474, p < 0.05)、无机氮(r = 0.532, p < 0.01)、C:P (r = 0.560, p < 0.01)和N:P (r = 0.420, p < 0.05)呈显著正相关；九峰山土壤微生物量碳与铵态氮(r = 0.578, p < 0.01)、无机氮(r = 0.573, p < 0.01)、C:P (r = 0.551, p < 0.01)和N:P (r = 0.465, p < 0.05)呈显著正相关；八分山和磨山土壤微生物量碳均与环境因子无显著差异。(3) 五座森林公园的土壤微生物量熵碳范围在1%~4%。层次分割法表明土壤微生物量碳的关键驱动因子为有机碳。

Abstract: To analyze the distribution characteristics and influencing factors of soil microbial carbon, and to explore the relationship between soil microbes and environmental factors. The study was con-ducted in the forest parks of Bafen Mountain, Qinglong Mountain, Maanshan Mountain, Mashan Mountain and Jiufeng Mountain in Wuhan City, and eight major constituent tree species were se-lected for each mountain, with a total of 120 sampling points, and soil samples were collected from September to November 2021, and inter-root soil samples were collected by the shaking drop method. The results showed that: (1) There were no significant differences in soil microbiomass carbon among different plant communities in Bafen Mountain 57.42~502.22 mg∙kg−1), Qinglong Mountain(148.59~563.78 mg∙kg−1), Ma’anshan Mountain (270.76~908.44 mg∙kg−1), and Mashan Mountain (137.45 ~ 654.81 mg∙kg−1) showed significant differences among soil microbial mass carbon of different plant communities, and Jiu Feng Shan (224.18~595.56 mg∙kg−1) showed non-significant differences among soil microbial mass carbon of different plants. (2) There was a significant positive correlation between soil microbial and ammonium nitrogen (r = 0.462, p < 0.05) in Qinglong, and a significant positive correlation between soil microbial amount carbon and organic carbon (r = 0.648, p < 0.01), nitrate nitrogen (r = 0.434, p < 0.05), ammonium nitrogen (r = 0.474, p < 0.05), inorganic nitrogen (r = 0.532, p < 0.01), C:P (r = 0.560, p < 0.01) and N:P (r = 0.420, p < 0.05) were significantly positively correlated; soil microbial amount carbon in Jiufeng was significantly positively correlated with ammonium nitrogen (r = 0.578, p < 0.01), inorganic nitrogen (r = 0.573, p < 0.01), C:P (r = 0.551, p < 0.01) and N:P (r = 0.465, p < 0.05) were significantly positively correlated; neither Bafen nor Moshan soil microbiomass carbon was significantly related to environmental factors. (3) Soil microbiomass entropy carbon in the five forest parks ranged from 1% to 4%. Hierarchical partitioning was further used to derive that the driver of soil microbiomass carbon was organic carbon.