武汉市森林公园常见植物根际土壤微生物量碳分布及其影响因素

钟言钰; 罗协; 李思悦

doi:10.12097/gbc.2023.09.011

武汉市森林公园常见植物根际土壤微生物量碳分布及其影响因素

Distribution and influencing factors of soil microbial carbon in plant rhizosphere in a Forest Park, Wuhan

摘要

摘要:
研究目的 土壤微生物生物量碳是土壤有机质中最活跃的组分，研究植物根际土壤微生物量碳对认识土壤碳汇及土壤肥力具有重要意义。
研究方法 以武汉市马鞍山森林公园为研究对象，选择4种不同植物类型（乔木、小乔木、灌木、草本）随机设置33个采样点，研究不同植物群落根际土壤微生物量碳分布特征的主要驱动因子。
研究结果 ①土壤微生物量碳在不同植物群落根际间存在显著差异，根际土壤微生物量碳的波动范围为270.76 ~ 908.44 mg/kg。②土壤微生物量碳与土壤有机碳（r=0.662, p < 0.01）、无机氮（r=0.510, p < 0.01）、碳磷比（r=0.519, p < 0.01）、铵态氮（r=0.355, p < 0.01）和硝态氮（r=0.485, p < 0.01）显著正相关，而与土壤速效磷（r=−0.134，p<0.05）显著负相关。③不同植物群落根际间的土壤微生物生物量熵碳的变化范围为1%~4%，其中黑足鳞毛蕨植物群落的根际最高，桂花植物群落根际最弱。④土壤有机碳、碳磷比和无机碳是影响土壤微生物生物量碳的主要因子，而碳氮比（36.36%，p < 0.01）和有机碳（24.42%，p < 0.05）是决定土壤微生物生物量熵碳含量的关键。
结论土壤碳氮比和有机碳是土壤微生物量熵碳的主要影响因子。不同植物根际土壤中微生物生物量碳间存在显著差异，相比之下黑足鳞毛蕨的根际土壤微生物固碳能力最高。

Abstract:
Objective Soil microbial biomass carbon is the most active component of soil organic matter. Studying the microbial biomass carbon in the rhizosphere soil is of great significance.
Methods The study took Ma’an Forest Park in Wuhan City as the research object, and four different plant types (trees, small trees, shrubs, and herbs) were selected to randomly set up 33 sampling points to study the main drivers of the distribution characteristics of rhizosphere soil microbial mass carbon in different plant communities.
Results ① Soil microbial biomass carbon was significantly different in the plant rhizosphere of different plant communities. The fluctuation range of soil microbial biomass carbon in the plant rhizosphere was 270.76 ~ 908.44 mg/kg. ② Soil microbial biomass carbon was significantly and positively correlated with soil organic carbon (r = 0.662, p < 0.01), inorganic nitrogen (r = 0.510, p < 0.01), carbon−to−phosphorus ratio (r = 0.519, p < 0.01), ammonium nitrogen (r = 0.355, p < 0.01), and nitrate nitrogen (r = 0.485, p < 0.01), while it was significantly and negatively correlated with soil quick−acting phosphorus (r =− 0.134, p < 0.05). ③ The variation of soil microbial biomass entropy carbon in the rhizosphere of different plant communities ranged from 1% to 4%, among which the rhizosphere of the Dryopteris fuscipes C. Chr. was the highest, and that of the osmanthus sp was the lowest. ④ Soil organic carbon, carbon to phosphorus ratio and inorganic carbon were the main factors affecting soil microbial biomass carbon, while carbon to nitrogen ratio (36.36%, p < 0.01) and organic carbon (24.42%, p < 0.05) were the key determinants of entropic carbon content of soil microbial biomass.
Conclusion Soil carbon to nitrogen ratio and organic carbon were the main influencing factors of soil microbial biomass entropy carbon. There were significant differences between the soil microbial biomass carbon in the inter−root soils of different plants, compared to the Dryopteris fuscipes C. Chr, which had the highest inter−root soil microbial carbon sequestration capacity.

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