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Long-term effects of vegetation and soil on the microbial communities following afforestation of farmland with Robinia pseudoacacia plantations
Geoderma ( IF 6.1 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.geoderma.2020.114263
Miaoping Xu , Dexin Gao , Shuyue Fu , Xuqiao Lu , Shaojun Wu , Xinhui Han , Gaihe Yang , Yongzhong Feng

Abstract Soil microorganisms play an important role in the functional connection of nutrient cycling between plants and soil ecosystems, but the exact responses of microbial communities to change in plant characteristics and soil properties remain uncertain. We analyzed the soil microbial communities of afforested tree stands of varying ages to assess the effects of vegetation and soil quality on soil microbial communities. We studied Robinia pseudoacacia plantations in the Loess Plateau for three age classes (RP13, RP29, and RP44), and compared results from these classes to one farmland (FL) control. The responses of soil microbial communities to changes in understory flora and soil physicochemical properties, including the Shannon index, richness, coverage, and biomass were analyzed. Compared with FL, afforestation significantly increased the Shannon index, species richness, coverage, and biomass of understory plants, which were highest in RP29. The concentrations of soil organic carbon (SOC), total nitrogen (TN), nitrate nitrogen (NO3−-N), and ammoniacal nitrogen (NH4+-N) were highest in RP44. The soil microbial community diversity index was significantly affected by afforestation. The relative abundances of bacterial populations were also affected, with Proteobacteria being dominant in RP29 and Actinobacteria being dominant in FL. Similarly, in fungi, the relative abundance of Basidiomycota was highest in FL, while the relative abundances of Zygomycota were highest in RP29. Pearson correlation analysis revealed that the Shannon and Chao indices of soil fungi were significantly positively correlated with SOC and NH4+-N. RDA showed that SOC, NH4+-N, and soil water content (SWC) were significantly associated with soil bacterial community composition. Soil fungal community composition were significantly affected by the Shannon and Richness indexes of understory flora. The results showed that characteristics of understory flora, soil properties, and soil microbial community composition were all affected by afforestation. The composition of the fungal community was correlated with changes in the diversity of understory flora. The changes in nutrients such as organic carbon and inorganic nitrogen was the key to the changes of soil microorganisms as plant colonization.

中文翻译:

刺槐人工林农田造林后植被和土壤对微生物群落的长期影响

摘要 土壤微生物在植物与土壤生态系统养分循环的功能联系中发挥着重要作用,但微生物群落对植物特征和土壤性质变化的确切反应仍不确定。我们分析了不同年龄的造林林分的土壤微生物群落,以评估植被和土壤质量对土壤微生物群落的影响。我们研究了黄土高原刺槐种植园的三个年龄等级(RP13、RP29 和 RP44),并将这些等级的结果与一个农田 (FL) 对照进行了比较。分析了土壤微生物群落对林下植物群和土壤理化性质变化的响应,包括香农指数、丰富度、覆盖度和生物量。与FL相比,造林显着提高了林下植物的香农指数、物种丰富度、覆盖度和生物量,在 RP29 中最高。RP44 中土壤有机碳 (SOC)、总氮 (TN)、硝态氮 (NO3--N) 和氨态氮 (NH4+-N) 的浓度最高。植树造林对土壤微生物群落多样性指数的影响显着。细菌种群的相对丰度也受到影响,变形菌在 RP29 中占优势,放线菌在 FL 中占优势。同样,在真菌中,担子菌的相对丰度在 FL 中最高,而接合菌的相对丰度在 RP29 中最高。Pearson相关分析表明土壤真菌的Shannon和Chao指数与SOC和NH4+-N呈显着正相关。RDA 显示 SOC,NH4+-N 和土壤含水量(SWC)与土壤细菌群落组成显着相关。土壤真菌群落组成受林下植物群香农指数和丰富度指数的显着影响。结果表明,林下植物群特征、土壤性质和土壤微生物群落组成均受造林影响。真菌群落的组成与林下植物群多样性的变化相关。有机碳、无机氮等养分的变化是植物定植过程中土壤微生物发生变化的关键。结果表明,林下植物群特征、土壤性质和土壤微生物群落组成均受造林影响。真菌群落的组成与林下植物群多样性的变化相关。有机碳、无机氮等养分的变化是植物定植过程中土壤微生物发生变化的关键。结果表明,林下植物群特征、土壤性质和土壤微生物群落组成均受造林影响。真菌群落的组成与林下植物群多样性的变化相关。有机碳、无机氮等养分的变化是植物定植过程中土壤微生物发生变化的关键。
更新日期:2020-05-01
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