福建典型茶园土壤真菌群落特征对不同活性有机碳组分的影响

Effects of Soil Fungal Community Characteristics on Different Activated Organic Carbon Components in Typical Tea Gardens of Fujian

摘要:

选择福鼎市白琳镇、磻溪镇、管阳镇、太姥山镇和点头镇5个乡镇典型茶园土壤作为研究对象，分析茶园土壤中真菌群落特征及其对不同活性有机碳组分的影响。结果表明：①茶园土壤中易氧化态有机碳(EOC)、微生物生物量碳(MBC)、可溶性有机碳(DOC)含量均值分别为6.11 mg/g、200.85 mg/kg和68.27 mg/kg，EOC/SOC、MBC/SOC、DOC/SOC占比均值分别为34.05%、1.14%、0.42%；②茶园土壤真菌群落OTU数为点头镇>白琳镇>管阳镇>太姥山镇>磻溪镇，其中优势菌门为子囊菌门(Ascomycota)和担子菌门(Basidiomycota)，优势菌属为原隐球菌属(Saitozyma)、被孢霉属(Mortierella)和Pleuroascus，不同茶园土壤中的真菌群落组成结构相似，但真菌多样性指数差异显著(P<0.05)；③真菌群落多样性特征方面，EOC、DOC含量与真菌群落多样性存在显著相关性(P<0.05)；在真菌群落组成结构方面，Pleuroascus、Cpronia、Chloridum、Cladophialophora相对丰度与DOC、MBC含量呈显著正相关(P<0.05)，Moritierella、Westerdykella相对丰度与DOC、MBC含量呈显著负相关(P<0.05)；在真菌群落功能预测方面，腐生营养型真菌对土壤不同活性有机碳组分的积累影响显著。

Abstract:

In this study, typical tea garden soils were collected from Bailin, Panxi, Guanyang, Taimushan and Diantou towns of Fuding City to analyze the characteristics of fungal communities in tea garden soils and their effects on different activated organic carbon components. The results showed that: 1) The average contents of oxidizable organic carbon (EOC), microbial biomass carbon (MBC) and soluble organic carbon (DOC) in tea garden soils were 6.11 mg/g, 200.85 mg/kg, 68.27 mg/kg, and the average proportions of EOC/SOC, MBC/SOC, DOC/SOC were 34.05%, 1.14% and 0.42%, respectively. 2) The OTU numbers of soil fungal communities in tea gardens were in an order of Diantou>Bailin>Guanyang>Taimushan>Panxi, among which the dominant phylum were Ascomycetes and Basidiomycetes, and the dominant genus were Saitozyma, Mortierella, Pleuroascus, and the composition and structure of fungal communities were similar in different tea garden soils, but the fungal diversity index was significantly different (P<0.05). 3) In terms of fungal community diversity, EOC and DOC were significantly correlated with fungal community diversity (P<0.05). In terms of community composition, Pleuroascus, Cpronia, Chloridum and Cladophialophora were significantly positively correlated with DOC and MBC (P<0.05), however, Moritierella and Westerdykella were significantly negatively correlated with DOC and MBC (P<0.05). In terms of fungal community function prediction, saprophytic fungi had a significant impact on the accumulation of different activated organic carbon components in soil.